A wind turbine generator set frequency converter air cooling heat dissipation device

Abstract

The present application relates to the technical field of air-cooled heat dissipation device, and discloses a wind turbine generator set frequency converter air-cooled heat dissipation device, which comprises a heat dissipation device shell, a heat-conducting base plate and a mounting frame. The shell air outlet is provided with a motor-driven fan blade, and the negative pressure suction cold air enters the shell, exchanges heat through the heat dissipation fins and is discharged. The heat-conducting base plate surface is provided with heat dissipation fins and is provided with an air outlet groove, and the air outlet groove upper and lower T-shaped mounting frames are connected through a rotating shaft and are provided with a flow guide swing piece, which is reciprocatingly swung in cooperation with a torsional spring and an elastic element. When the airflow blows, the flow guide swing piece swings, periodically changes the air outlet angle, makes the airflow uniformly cover the heat dissipation fins, eliminates the dead angle and destroys the thermal boundary layer to strengthen heat exchange; at the same time, the swing airflow produces dynamic sweeping on the heat dissipation fins and the base plate surface, prevents dust deposition and blocks the air duct. The device does not need additional driving elements, synchronously realizes heat dissipation strengthening and air duct self-cleaning, and effectively prolongs the maintenance period.

Description

Technical Field

[0001] This invention relates to the field of air-cooled heat dissipation devices, specifically an air-cooled heat dissipation device for a wind turbine generator frequency converter. Background Technology

[0002] The frequency converter of a wind turbine generator set is the core component for realizing power conversion and unit operation control. The internal power devices generate a lot of heat during continuous operation, which needs to be dissipated in a timely manner through a matching heat dissipation device to ensure that the device operating temperature is within a safe and reasonable range. Air-cooled heat dissipation devices have been widely used in frequency converter heat dissipation scenarios due to their simple structure and convenient installation and maintenance.

[0003] Existing inverter air-cooling devices mostly adopt a fixed air duct and directional airflow design. The cooling airflow is driven by a fan and flows along a preset fixed path through the surface and gaps of the heat sink. In this directional airflow structure, the fixed airflow angle is difficult to uniformly cover the entire heat sink area, easily forming heat dissipation dead zones in the local gaps of the heat sink. Moreover, the steady-state airflow forms a relatively stable thermal boundary layer on the surface of the heat sink, which restricts the heat exchange efficiency between the air and the heat sink and thermally conductive substrate, and the overall heat dissipation effect is significantly limited. At the same time, the constant and stable airflow has a weak scouring effect on the surface of the heat dissipation structure, and dust carried in the air is easy to accumulate in the gaps of the heat sink and inside the air duct. Long-term operation will cause the air duct resistance to increase and the heat dissipation performance to gradually decline, requiring frequent cleaning and maintenance, which increases the operation and maintenance cost of the device. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an air-cooled heat dissipation device for wind turbine generator frequency converters. This addresses the issues raised in the background section, such as the formation of heat dissipation dead zones at local gaps in the heat sinks, the formation of a relatively stable thermal boundary layer on the surface of the heat sinks by steady-state airflow, which restricts the heat exchange efficiency between the air and the heat sinks and thermally conductive substrate. This results in a significant limitation on improving the overall heat dissipation effect, and long-term operation leads to increased airflow resistance and gradual degradation of heat dissipation performance, requiring frequent cleaning and maintenance, thus increasing the operation and maintenance costs of the device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wind turbine generator frequency converter air-cooled heat dissipation device, comprising: A heat dissipation device housing, wherein a motor is installed at the air outlet of the heat dissipation device housing, and fan blades are coaxially mounted on the rotor of the motor; A thermally conductive substrate is disposed inside the housing of a heat dissipation device. Air outlet grooves are uniformly formed on the surface of the thermally conductive substrate, and heat dissipation fins are uniformly distributed on the surface of the thermally conductive substrate. The air outlet grooves are located between the heat dissipation fins. The mounting frame is set on the surface of the heat-conducting substrate. The mounting frames are evenly distributed above and below the air outlet slot. Each mounting frame is equipped with a flow guide vane via a rotating shaft. A torsion spring is installed between the flow guide vane and the mounting frame. The mounting frame has an U-shaped design. An elastic element is installed between the flow guide vane and the inner sidewall of the mounting frame.

[0006] Preferably, the surface of the heat sink is uniformly provided with guide grooves, and the surface of the guide vane is uniformly provided with guide ribs. The guide grooves extend along the length of the heat sink and are used to guide and divert the airflow passing through the surface of the heat sink, so that the airflow forms a directional flow at the air outlet slot between the heat sinks, avoiding the formation of eddies and stagnation of airflow on the surface of the heat sink, thereby improving the heat exchange efficiency. The guide ribs are inclined along the swing direction of the guide vane. When the airflow impacts the guide vane, the guide ribs can further disperse the airflow into multiple fine streams and guide the fine streams to uniformly cover the air outlet slot area below. At the same time, the guide ribs and the guide grooves form a cooperative guiding relationship, so that the airflow after being deflected by the guide vane can smoothly enter the air outlet slot, reducing the turbulence loss of airflow between the guide vane and the heat sink, and improving the overall airflow uniformity and heat dissipation effect of the heat dissipation device.

[0007] Preferably, mounting grooves are formed on the surface of the thermally conductive substrate at positions corresponding to the heat sinks. The heat sinks are installed inside the mounting grooves, and the depth of the mounting grooves is adapted to the height of the heat sinks. After the heat sinks are embedded in the mounting grooves, their bottoms fit tightly against the bottom of the grooves, forming a large-area heat conduction contact surface between the heat sinks and the thermally conductive substrates. This facilitates the rapid transfer of heat generated by the frequency converter to the surface of the heat sinks. The width of the mounting grooves is slightly larger than the thickness of the heat sinks, providing elastic space for the slight deformation of the heat sinks due to thermal expansion and contraction. This prevents the heat sinks from breaking or falling off due to rigid constraints under alternating temperature conditions. At the same time, the sidewalls of the mounting grooves provide lateral restraint for the heat sinks, preventing them from shifting laterally in a vibration environment and ensuring the structural stability of the heat dissipation device during long-term operation.

[0008] Preferably, each heat sink has an expansion joint ridge installed on its mounting side, and the inner wall of the mounting groove is evenly provided with slots. The expansion joint ridge is an annular or strip-shaped protrusion located at the edge of the heat sink mounting side. When the heat sink is pressed into the mounting groove, the expansion joint ridge is compressed and undergoes radial elastic deformation, embedding itself into the slot, thereby achieving a mechanical interlocking connection between the heat sink and the mounting groove. The slots are evenly distributed axially along the inner wall of the mounting groove. After the expansion joint ridge is inserted into the slot, the axial position of the heat sink in the mounting groove is fixed, preventing it from sliding along the surface of the heat-conducting substrate. At the same time, the interference fit between the expansion joint ridge and the slot generates continuous radial pressure, keeping the heat sink and the mounting groove in a tight thermal contact state. Even under long-term thermal cycling, it is not easy to loosen, ensuring the continuity and reliability of the heat transfer path.

[0009] Preferably, a filter screen is installed at the air inlet of the heat dissipation device housing. Bolts are screwed onto the four corners of the filter screen, which has a detachable design. It covers the air inlet of the heat dissipation device housing to prevent external dust, sand, and insects from entering the heat dissipation device, thus preventing foreign objects from adhering to the heat dissipation fins or clogging the air outlet and causing a decrease in heat dissipation performance. The bolts pass through the mounting holes at the four corners of the filter screen and engage with the threaded holes on the edge of the air inlet of the heat dissipation device housing, enabling quick installation and removal of the filter screen. This facilitates regular cleaning or replacement of the filter screen without disassembling the entire heat dissipation device housing, reducing maintenance difficulty and costs. The mesh size of the filter screen is selected to suit the operating environment of the wind turbine generator set, ensuring unobstructed airflow while effectively intercepting fine particles, balancing the relationship between filtration effect and ventilation resistance.

[0010] Preferably, a dustproof frame is installed at the air outlet of the inner cavity of the heat dissipation device housing, and a dustproof net is installed on the surface of the dustproof frame. The dustproof frame is fixedly installed in the inner cavity of the heat dissipation device housing near the air outlet. The dustproof net is stretched on the surface of the dustproof frame to perform secondary filtration of the airflow discharged from the air outlet channel, preventing fine dust and thermal grease particles inside the frequency converter from leaking out with the airflow and avoiding contamination of surrounding electrical components. At the same time, the dustproof net creates a certain airflow resistance at the air outlet, causing the high-temperature airflow after heat exchange with the heat sink to decrease in velocity and increase in pressure at the air outlet. This facilitates the airflow to fully exchange heat with the heat sink in the air outlet channel before being discharged, indirectly improving the effective heat exchange time and heat exchange capacity of the heat sink. The frame of the dustproof frame and the inner cavity of the heat dissipation device housing are sealed together to reduce the possibility of airflow leakage from the edge gaps without being filtered by the dustproof net.

[0011] Preferably, an mounting platform is installed inside the outer cavity of the heat dissipation device housing. First threaded rods are screwed onto the four corners of the dustproof frame. The mounting platform is located in the area near the air outlet inside the outer cavity of the heat dissipation device housing to support the dustproof frame and provide a stable mounting reference surface. The first threaded rods pass through the through holes at the four corners of the dustproof frame and engage with the threaded holes on the surface of the mounting platform, firmly pressing the dustproof frame onto the mounting platform to form a reliable sealed connection between the dustproof frame and the inner cavity of the heat dissipation device housing. A sealing gasket can be placed between the surface of the mounting platform and the contact surface of the dustproof frame to further enhance the sealing effect and prevent airflow short-circuiting. When cleaning or replacing the dustproof screen, simply loosen the first threaded rods to remove the dustproof frame from the mounting platform. The operation is simple, and the presence of the mounting platform ensures consistent positional accuracy of the dustproof frame each time it is reinstalled, avoiding sealing failure due to installation deviations.

[0012] Preferably, the air outlet of the heat dissipation device housing is equipped with a fixed frame, and an air outlet grille is installed on the surface of the fixed frame. The fixed frame covers the outside of the air outlet of the heat dissipation device housing, and the air outlet grille is installed on the surface of the fixed frame to rectify and guide the exhaust airflow, so that the airflow is discharged outward in a more regular state, reducing the interference of external crosswinds on the outlet airflow. At the same time, the grille structure of the air outlet grille forms a physical barrier against external rain, snow and foreign objects, preventing rainwater from flowing back into the heat dissipation device or large particles of foreign objects from being sucked in by the airflow. The grille bars of the air outlet grille are arranged perpendicular to the airflow discharge direction, and the spacing between the grille bars is optimized by fluid dynamics to provide sufficient structural strength while ensuring ventilation area, and to prevent the grille bars from vibrating or deforming under strong wind conditions. The connection structure between the fixed frame and the air outlet of the heat dissipation device housing ensures the overall sealing and ease of assembly.

[0013] Preferably, the air outlet sidewall of the heat dissipation device housing is equipped with a mounting side plate, and each of the four corners of the surface of the fixing frame is screwed with a second threaded rod. The mounting side plate extends outward to form a mounting plane, providing lateral mounting support for the fixing frame. The second threaded rod passes through the mounting holes at the four corners of the fixing frame and engages with the threaded holes on the surface of the mounting side plate, tightly fixing the fixing frame to the mounting side plate, thus forming a stable assembly relationship between the fixing frame and the air outlet of the heat dissipation device housing. The mounting side plate ensures that the installation of the fixing frame does not depend on the structural strength of the air outlet end face of the heat dissipation device housing, avoiding stripping or deformation of the threaded holes on the air outlet end face due to frequent disassembly and assembly. This is especially suitable for heat dissipation device housings with thinner wall thickness or lower material strength at the air outlet end face. At the same time, a sealing ring can be provided between the mounting side plate and the fixing frame to prevent airflow leakage from the joint between the fixing frame and the heat dissipation device housing.

[0014] Preferably, the bottom of the guide channel is a sloping structure, and the depth of the guide channel gradually increases along the airflow direction. The sloping bottom makes the guide channel wedge-shaped in cross-section, shallow at one end and deep at the other. When the airflow flows along the surface of the heat sink and enters the guide channel, the sloping bottom of the channel generates a downward guiding force on the airflow, guiding the airflow to accelerate along the depth direction of the guide channel. At the same time, the design of gradually increasing channel depth along the airflow direction gradually increases the flow cross-sectional area of ​​the guide channel. As the airflow flows through the guide channel, the flow velocity gradually decreases and the static pressure gradually recovers. This is beneficial for the airflow to smoothly merge into the exhaust channel at a lower flow velocity at the end of the guide channel, reducing turbulence noise when the airflow is discharged. In addition, the structure of gradually increasing channel depth makes the end of the guide channel near the root of the heat sink shallower, avoiding weakening the structural strength of the root of the heat sink, and the end near the top of the heat sink deeper, making full use of the space at the top of the heat sink for airflow guidance. This maximizes the guiding effect without affecting the overall strength of the heat sink, achieving synergistic optimization of structural strength and aerodynamic performance.

[0015] Compared with the prior art, the present invention provides a wind-cooled heat dissipation device for wind turbine generator frequency converters, which has the following beneficial effects: This wind turbine inverter's air-cooled heat dissipation device uses a motor-driven fan blade rotation to draw external cooling air into the heat dissipation device's casing under negative pressure. The air then undergoes thorough heat exchange through the heat sinks before being expelled from the casing. Furthermore, the airflow from the outlet directly acts on the guide vanes. Under the combined action of air pressure and the restoring force of the torsion springs and elastic elements, the guide vanes oscillate around their rotation axis, periodically changing the outlet angle and airflow diffusion range. This ensures the airflow more evenly covers the gaps and surfaces of each heat sink, preventing insufficient airflow in certain areas and the formation of heat dissipation dead zones. Simultaneously, the airflow disturbance caused by the oscillation disrupts the thermal boundary layer on the heat sink surface, enhancing the heat exchange efficiency between the air, the heat sink, and the thermally conductive substrate, effectively improving the overall heat dissipation efficiency. As a result, it ensures the stable operating temperature of the core components of the frequency converter. Based on the continuous change in airflow direction and turbulence caused by the reciprocating oscillation of the guide vanes, the directional airflow will continuously change the blowing angle with the oscillation of the vanes, and generate a continuous dynamic blowing effect on the dust attached to the gaps of the heat sink and the surface of the heat-conducting substrate. This prevents dust from accumulating in the heat dissipation duct, causing duct blockage and increased air resistance, and prevents the heat dissipation performance from gradually decreasing with the increase of operating time. Moreover, the entire oscillation and blowing process can be achieved by the power of the cooling airflow itself combined with the restoring force of the torsion spring and elastic element. No additional drive components and control circuits are required. Without increasing the energy consumption of the device or increasing the structural complexity, it simultaneously achieves the dual effects of enhanced heat dissipation and self-cleaning of the air duct, effectively extending the maintenance cycle and reliable service life of the heat dissipation device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the installation structure of the heat sink of the present invention; Figure 4 This is a schematic diagram of the structure of the thermally conductive substrate of the present invention; Figure 5 This is a schematic diagram of the structure of the flow guide vane of the present invention; Figure 6 This is a schematic diagram of the installation structure of the flow guide vane of the present invention.

[0017] In the diagram: 1. Heat dissipation device housing; 2. Motor; 3. Fan blade; 4. Thermal conductive substrate; 5. Air outlet duct; 6. Heat sink; 7. Air guide duct; 8. Mounting frame; 9. Air guide vane; 10. Torsion spring; 11. Elastic element; 12. Air guide rib; 13. Mounting groove; 14. Filter screen; 15. Bolt; 16. Dustproof frame; 17. Dustproof net; 18. Mounting platform; 19. First threaded rod; 20. Fixing frame; 21. Air outlet grille; 22. Second threaded rod; 23. Mounting side plate. Detailed Implementation

[0018] This invention provides a technical solution: a wind-cooled heat dissipation device for a wind turbine generator frequency converter. Please refer to [link / reference]. Figure 1 and Figure 2 It includes a heat dissipation device housing 1, a motor 2 installed at the air outlet of the heat dissipation device housing 1, and a fan blade 3 coaxially mounted on the rotor of the motor 2. The thermally conductive substrate 4 is disposed inside the heat dissipation device housing 1. Please refer to [link / reference]. Figure 4 The surface of the heat-conducting substrate 4 is uniformly provided with air outlet grooves 5. Please refer to [link / reference]. Figure 3 Heat sinks 6 are evenly distributed on the surface of the heat-conducting substrate 4, and air outlet slots 5 are located between the heat sinks 6. Mounting frames 8 are disposed on the surface of the heat-conducting substrate 4. The mounting frames 8 are evenly distributed above and below the air outlet slots 5. (See also...) Figure 5 Please see Figure 6 Each of the mounting frames 8 is equipped with a flow guide vane 9 via a rotating shaft. A torsion spring 10 is installed between the flow guide vane 9 and the mounting frame 8. The mounting frame 8 has a U-shaped design. An elastic element 11 is installed between the flow guide vane 9 and the inner sidewall of the mounting frame 8.

[0019] When motor 2 drives fan blade 3 to rotate, fan blade 3 exhausts air to the outside of heat dissipation device housing 1, creating a negative pressure on the air intake side of fan blade 3, i.e., the corresponding area inside heat dissipation device housing 1. Since the heat-conducting substrate 4 is located on the air intake side of fan blade 3, the outside cooling air enters the interior of heat dissipation device housing 1 under the suction of negative pressure. It first flows through the air outlet groove 5 opened between heat dissipation fins 6 on the surface of heat-conducting substrate 4, and after being blown out from the air outlet groove 5, it enters the gap area between adjacent heat dissipation fins 6, flows along the surface of heat dissipation fins 6, and fully exchanges heat with heat-conducting substrate 4 and heat dissipation fins 6. Finally, after heat exchange... Hot air is drawn out of the casing by fan blades 3; by setting mounting frames 8 above and below the air outlet slot 5 of the heat-conducting substrate 4, and mounting a guide vane 9 with torsion spring 10 and elastic element 11 between the mounting frames 8 via a rotating shaft, the airflow blowing out of the air outlet slot 5 directly acts on the guide vane 9. Under the combined action of airflow pressure and the restoring force of torsion spring 10 and elastic element 11, the guide vane 9 oscillates back and forth around the rotating shaft, which can periodically change the air outlet angle and airflow diffusion range of the air outlet slot 5, so that the blown airflow can more evenly cover each group of heat sinks 6. The gaps and surfaces of the airflow guide vane 9 prevent insufficient airflow in the local heat sink 6 area, thus avoiding heat dissipation dead zones. At the same time, the airflow disturbance caused by the swing can destroy the thermal boundary layer on the surface of the heat sink 6, enhance the heat exchange efficiency between the air and the heat sink 6 and the thermally conductive substrate 4, effectively improve the overall heat dissipation effect, and ensure the stable operating temperature of the core components of the frequency converter. Based on the continuous change of airflow direction and turbulence disturbance characteristics caused by the reciprocating swing of the guide vane 9, the directional airflow will continuously change the blowing angle with the swing of the vane, and generate a continuous dynamic blowing effect on the dust attached to the gaps of the heat sink 6 and the surface of the thermally conductive substrate 4. This prevents dust from accumulating in the heat dissipation duct, causing duct blockage and increased air resistance, and prevents the heat dissipation performance from gradually decreasing with the increase of operating time. Moreover, the entire swing and blowing process can be achieved by the power of the cooling airflow itself combined with the restoring force of the torsion spring 10 and the elastic element 11. No additional drive components and control circuits are required. Without increasing the energy consumption of the device or increasing the structural complexity, the dual effects of heat dissipation enhancement and air duct self-cleaning are achieved simultaneously, effectively extending the maintenance cycle and reliable service life of the heat dissipation device.

[0020] The surface of the heat sink 6 is uniformly provided with guide grooves 7, and the surface of the guide vane 9 is uniformly provided with guide ribs 12. The guide grooves 7 extend along the length of the heat sink 6 and are used to guide and divert the airflow passing through the surface of the heat sink 6, so that the airflow forms a directional flow at the air outlet slot 5 between the heat sink 6, avoiding the formation of eddies and stagnation of airflow on the surface of the heat sink 6, thereby improving the heat exchange efficiency. The guide ribs 12 are inclined along the swing direction of the guide vane 9. When the airflow impacts the guide vane 9, the guide ribs 12 can further disperse the airflow into multiple fine streams and guide the fine streams to uniformly cover the area of ​​the air outlet slot 5 below. At the same time, the guide ribs 12 and the guide grooves 7 form a cooperative guiding relationship, so that the airflow after being deflected by the guide vane 9 can smoothly enter the air outlet slot 5, reducing the turbulence loss of airflow between the guide vane 9 and the heat sink 6, and improving the overall airflow uniformity and heat dissipation effect of the heat dissipation device.

[0021] Please see Figure 4 Mounting grooves 13 are provided on the surface of the heat-conducting substrate 4 at positions corresponding to the heat sink 6. The heat sink 6 is installed inside the mounting grooves 13. The depth of the mounting grooves 13 is adapted to the height of the heat sink 6. After the heat sink 6 is embedded in the mounting groove 13, its bottom is in close contact with the bottom of the mounting groove 13, so that a large area of ​​heat conduction contact surface is formed between the heat sink 6 and the heat-conducting substrate 4, which is conducive to the rapid transfer of heat generated by the frequency converter to the surface of the heat sink 6. The width of the mounting groove 13 is slightly larger than the thickness of the heat sink 6, which provides elastic space for the slight deformation of the heat sink 6 due to thermal expansion and contraction, and prevents the heat sink 6 from breaking or falling off due to rigid constraints under temperature alternation conditions. At the same time, the side wall of the mounting groove 13 forms a lateral limit for the heat sink 6, preventing the heat sink 6 from shifting laterally in the vibration environment, and ensuring the structural stability of the heat dissipation device during long-term operation.

[0022] Each heat sink 6 has an expansion joint ridge installed on its mounting side. The inner wall of the mounting groove 13 is evenly provided with slots. The expansion joint ridge is a ring-shaped or strip-shaped protrusion structure set on the edge of the mounting side of the heat sink 6. When the heat sink 6 is pressed into the mounting groove 13, the expansion joint ridge is squeezed and undergoes radial elastic deformation, embedding into the slot, thereby realizing the mechanical interlocking connection between the heat sink 6 and the mounting groove 13. The slots are evenly distributed along the inner wall of the mounting groove 13. After the expansion joint ridge is inserted into the slot, the axial position of the heat sink 6 in the mounting groove 13 is fixed and cannot slide along the surface of the heat-conducting substrate 4. At the same time, the interference fit between the expansion joint ridge and the slot generates continuous radial pressure, so that the heat sink 6 and the mounting groove 13 maintain a tight thermal contact state, which is not easy to loosen even under long-term thermal cycling, ensuring the continuity and reliability of the heat transfer path.

[0023] Please see Figure 2A filter screen 14 is installed at the air inlet of the heat dissipation device housing 1. Bolts 15 are screwed onto the four corners of the filter screen 14. The filter screen 14 adopts a detachable structure design and covers the air inlet of the heat dissipation device housing 1 to block external dust, sand, flying insects and other foreign objects from entering the heat dissipation device. This prevents foreign objects from adhering to the surface of the heat dissipation fins 6 or blocking the air outlet slots 5, which would reduce the heat dissipation performance. The bolts 15 pass through the mounting holes at the four corners of the filter screen 14 and are screwed into the threaded holes on the edge of the air inlet of the heat dissipation device housing 1, which enables quick installation and removal of the filter screen 14. This facilitates regular cleaning or replacement of the filter screen 14 without disassembling the entire heat dissipation device housing 1, reducing maintenance difficulty and cost. The mesh size of the filter screen 14 is adapted to the operating environment of the wind turbine generator set, ensuring smooth air intake while effectively intercepting fine particles, thus balancing the relationship between filtration effect and ventilation resistance.

[0024] A dustproof frame 16 is installed at the air outlet of the inner cavity of the heat dissipation device housing 1. A dustproof net 17 is installed on the surface of the dustproof frame 16. The dustproof frame 16 is fixedly installed in the inner cavity of the heat dissipation device housing 1 near the air outlet. The dustproof net 17 is stretched on the surface of the dustproof frame 16 to perform secondary filtration on the airflow discharged from the air outlet slot 5, preventing fine dust and thermal grease particles inside the frequency converter from leaking out with the airflow and avoiding contamination of surrounding electrical components. At the same time, the dustproof net 17 creates a certain airflow resistance at the air outlet, so that the high-temperature airflow after heat exchange with the heat sink 6 decreases in velocity and increases in pressure at the air outlet. This is conducive to the airflow fully exchanging heat with the heat sink 6 in the air outlet slot 5 before being discharged, indirectly improving the effective heat exchange time and heat exchange capacity of the heat sink 6. The frame of the dustproof frame 16 and the inner cavity of the heat dissipation device housing 1 are sealed together to reduce the leakage of airflow from the edge gaps without being filtered by the dustproof net 17.

[0025] An mounting platform 18 is installed inside the outer cavity of the heat dissipation device housing 1. First threaded rods 19 are screwed onto the four corners of the surface of the dustproof frame 16. The mounting platform 18 is located in the area near the air outlet inside the outer cavity of the heat dissipation device housing 1, supporting the dustproof frame 16 and providing a stable mounting reference surface for it. The first threaded rods 19 pass through the through holes at the four corners of the dustproof frame 16 and screw into the threaded holes on the surface of the mounting platform 18, firmly pressing the dustproof frame 16 onto the mounting platform 18, thus forming a reliable sealed connection between the dustproof frame 16 and the inner cavity of the heat dissipation device housing 1. A sealing gasket can be placed between the surface of the mounting platform 18 and the contact surface of the dustproof frame 16 to further enhance the sealing effect and prevent airflow short-circuiting. When cleaning or replacing the dustproof screen 17 is required, simply loosening the first threaded rods 19 is sufficient to remove the dustproof frame 16 from the mounting platform 18. The operation is simple, and the presence of the mounting platform 18 ensures that the positional accuracy of the dustproof frame 16 is consistent each time it is reinstalled, avoiding sealing failure due to installation deviation.

[0026] Please see Figure 1 and Figure 2 A fixed frame 20 is installed at the air outlet of the heat dissipation device housing 1. An air outlet grille 21 is installed on the surface of the fixed frame 20. The fixed frame 20 covers the outside of the air outlet of the heat dissipation device housing 1. The air outlet grille 21 is installed on the surface of the fixed frame 20 to rectify and guide the exhaust airflow, so that the airflow is discharged outward in a more regular state, reducing the interference of external crosswinds on the outlet airflow. At the same time, the grille structure of the air outlet grille 21 forms a physical barrier against external rain, snow and foreign objects, preventing rainwater from flowing back into the heat dissipation device or large particles of foreign objects from being sucked in by the airflow. The grille bars of the air outlet grille 21 are arranged perpendicular to the airflow discharge direction. The spacing between the grille bars is optimized by fluid dynamics to provide sufficient structural strength while ensuring ventilation area, and to prevent the grille bars from vibrating or deforming under strong wind conditions. The connection structure between the fixed frame 20 and the air outlet of the heat dissipation device housing 1 ensures the overall sealing and ease of assembly.

[0027] A mounting side plate 23 is installed on the air outlet side wall of the heat dissipation device housing 1. A second threaded rod 22 is screwed onto each of the four corners of the surface of the fixing frame 20. The mounting side plate 23 extends outward to form a mounting plane, providing lateral mounting support for the fixing frame 20. The second threaded rod 22 passes through the mounting holes at the four corners of the fixing frame 20 and engages with the threaded holes on the surface of the mounting side plate 23, tightly fixing the fixing frame 20 to the mounting side plate 23, thus forming a stable assembly relationship between the fixing frame 20 and the air outlet of the heat dissipation device housing 1. The mounting side plate 23 ensures that the installation of the fixing frame 20 does not depend on the structural strength of the air outlet end face of the heat dissipation device housing 1, avoiding stripping or deformation of the threaded holes on the air outlet end face due to frequent disassembly and assembly. This is especially suitable for heat dissipation device housings 1 with thinner wall thickness or lower material strength at the air outlet end face. Simultaneously, a sealing ring can be installed between the mounting side plate 23 and the fixing frame 20 to prevent airflow leakage from the joint between the fixing frame 20 and the heat dissipation device housing 1.

[0028] The bottom of the guide channel 7 is a sloping structure, and the depth of the guide channel 7 gradually increases along the airflow direction. The sloping bottom makes the guide channel 7 wedge-shaped in cross-section, with one end shallow and the other deep. When the airflow flows along the surface of the heat sink 6 and enters the guide channel 7, the sloping bottom of the channel generates a downward guiding force on the airflow, guiding the airflow to accelerate along the depth direction of the guide channel 7. At the same time, the design of gradually increasing channel depth along the airflow direction gradually increases the flow cross-sectional area of ​​the guide channel 7. As the airflow flows through the guide channel 7, the flow velocity gradually decreases and the static pressure gradually recovers. This is conducive to the airflow smoothly merging into the exhaust channel 5 at a lower flow velocity at the end of the guide channel 7, reducing turbulence noise when the airflow is discharged. In addition, the structure of gradually increasing channel depth makes the end of the guide channel 7 closer to the root of the heat sink 6 shallower, avoiding weakening the structural strength of the root of the heat sink 6, and the end closer to the top of the heat sink 6 deeper, making full use of the space at the top of the heat sink 6 for airflow guidance. This maximizes the guidance effect without affecting the overall strength of the heat sink 6, achieving synergistic optimization of structural strength and aerodynamic performance.

[0029] In this design: Motor 2 drives fan blade 3 to rotate, creating a negative pressure inside the heat dissipation device housing 1. External cooling air enters through the inlet filter 14 and is drawn to the surface of the heat-conducting substrate 4. It first exits from the outlet slot 5. The airflow impacts the guide vanes 9 between the mounting frames 8. Under the combined action of airflow pressure and the restoring force of the torsion spring 10 and elastic element 11, the guide vanes 9 oscillate around the rotation axis. The guide ribs 12 on their surface disperse the airflow into multiple fine streams and change the blowing angle, causing the airflow to periodically cover the gaps between each set of heat dissipation fins 6. Simultaneously, it disturbs the thermal boundary layer on the surface of the heat dissipation fins 6 to enhance heat transfer. The airflow then enters the gaps between the heat dissipation fins 6 and flows along the guide grooves 7 on the surface of the heat dissipation fins 6. The bottom of the wedge-shaped groove flows along the direction of the airflow. The structure with gradually increasing groove depth guides the airflow to accelerate and then gradually reduce pressure, so that the airflow smoothly enters the air outlet groove 5 area in a low turbulence state. The bottom of the heat sink 6 is embedded in the mounting groove 13 of the heat-conducting substrate 4. The expansion joint protrusion and the slot are interference fit to ensure a large area of ​​thermal contact. After the heat is fully transferred by the heat sink 6, the heat exchange airflow is discharged after secondary filtration by the dust filter 17 at the air outlet. The back pressure generated by the dust filter 17 prolongs the heat exchange time between the airflow and the heat sink 6. The air outlet grille 21 rectifies and guides the discharged airflow and blocks rain, snow and foreign objects. Throughout the process, the continuous oscillation of the guide vane 9 synchronously blows away the dust accumulated on the surface of the heat sink 6 and in the air outlet groove 5, preventing the air duct from being blocked and achieving a synergistic effect of enhanced heat dissipation and self-cleaning.

Claims

1. A wind-cooled heat dissipation device for a wind turbine generator frequency converter, characterized in that, include: Heat dissipation device housing (1), the air outlet of the heat dissipation device housing (1) is equipped with a motor (2), and the rotor of the motor (2) is coaxially equipped with fan blades (3). A heat-conducting substrate (4) is disposed inside the heat dissipation device housing (1). Air outlet grooves (5) are uniformly opened on the surface of the heat-conducting substrate (4). Heat dissipation fins (6) are uniformly distributed on the surface of the heat-conducting substrate (4). The air outlet grooves (5) are located between the heat dissipation fins (6). Mounting frames (8) are set on the surface of the heat-conducting substrate (4). The mounting frames (8) are evenly distributed above and below the air outlet slot (5). Each mounting frame (8) is equipped with a flow guide vane (9) through a rotating shaft. A torsion spring (10) is installed between the flow guide vane (9) and the mounting frame (8). The mounting frame (8) is of the C-shape design. An elastic element (11) is installed between the flow guide vane (9) and the inner sidewall of the mounting frame (8).

2. The wind turbine generator frequency converter air-cooled heat dissipation device according to claim 1, characterized in that: The surface of the heat sink (6) is uniformly provided with flow guide grooves (7), and the surface of the flow guide vane (9) is uniformly provided with flow guide ribs (12).

3. The wind turbine generator frequency converter air-cooled heat dissipation device according to claim 1, characterized in that: The surface of the heat-conducting substrate (4) and the corresponding position of the heat sink (6) are provided with mounting grooves (13), and the heat sink (6) is installed inside the mounting grooves (13).

4. The wind turbine generator frequency converter air-cooled heat dissipation device according to claim 3, characterized in that: The heat sink (6) is equipped with expansion joint protrusions on its mounting side, and the mounting groove (13) is uniformly provided with slots on its inner sidewall.

5. The wind-cooled heat dissipation device for a wind turbine generator frequency converter according to claim 1, characterized in that: The air inlet of the heat dissipation device housing (1) is equipped with a filter screen (14), and bolts (15) are screwed onto the four corners of the surface of the filter screen (14).

6. The wind turbine generator frequency converter air-cooled heat dissipation device according to claim 1, characterized in that: The heat dissipation device housing (1) has a dustproof frame (16) installed at the air outlet of the inner cavity, and a dustproof net (17) is installed on the surface of the dustproof frame (16).

7. A wind turbine generator frequency converter air-cooled heat dissipation device according to claim 6, characterized in that: The inner cavity of the heat dissipation device housing (1) is equipped with an installation platform (18), and the four corners of the surface of the dustproof frame (16) are screwed with first threaded rods (19).

8. The wind turbine generator frequency converter air-cooled heat dissipation device according to claim 1, characterized in that: The air outlet of the heat dissipation device housing (1) is equipped with a fixed frame (20), and the surface of the fixed frame (20) is equipped with an air outlet grille (21).

9. A wind turbine generator frequency converter air-cooled heat dissipation device according to claim 8, characterized in that: The heat dissipation device housing (1) has an installation side plate (23) installed on the air outlet side wall, and the four corners of the surface of the fixing frame (20) are screwed with second threaded rods (22).

10. A wind turbine generator frequency converter air-cooled heat dissipation device according to claim 2, characterized in that: The bottom of the guide channel (7) is a sloping structure, and the depth of the guide channel (7) gradually increases along the flow direction of the airflow.

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