Gearbox cooling system for wind generating set

Abstract

The invention discloses a gearbox cooling system for a wind generating set, and relates to the technical field of wind power generation, the gearbox cooling system for the wind generating set comprises a first fan blade assembly, a heat dissipation mechanism and a heat conduction mechanism, a main shaft can drive the first fan blade assembly to rotate, and a cabin is provided with a plurality of heat dissipation openings; the heat dissipation mechanism comprises a heat dissipation assembly, a cooling circulation pipeline and an oil pump, the cooling circulation pipeline comprises an oil inlet section, a heat dissipation section and an oil return section which are communicated in sequence, the oil inlet section is communicated with the gearbox, and the heat dissipation assembly is connected with the heat dissipation section and arranged on the air outlet side of the first fan blade assembly; the first fan blade assembly can blow air exchanging heat with the heat dissipation assembly to the heat conduction ring through the heat dissipation opening, so that the temperature of the heat dissipation assembly is reduced, the cooling effect on lubricating oil in the heat dissipation section is improved, the heat of the gearbox is effectively reduced, the heat conduction ring can absorb heat and transmit the heat to the blades, and the heat dissipation efficiency is improved. Therefore, the temperature of the blade is increased to melt ice on the surface.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a gear box cooling system for a wind generator set. Background Art

[0002] As the impact of the greenhouse effect becomes increasingly severe, people are increasingly prioritizing clean energy, leading to a growing demand for wind turbines. When wind blows on the blades of existing wind turbines, they drive the connected main shaft to rotate, converting the wind energy into mechanical energy. The main shaft then rotates the rotor inside the generator, which cuts through the magnetic lines of flux in the stator's magnetic field, generating an induced electromotive force (EMF), thereby converting the mechanical energy into electrical energy. This energy can then be transmitted to the power grid or used for other electrical devices.

[0003] Existing wind turbines often experience gearbox overheating, forcing the blade speed to be reduced to maintain normal operation, which seriously affects the wind power generation efficiency; or the blade surface is covered with ice, which reduces the blade speed and seriously affects the wind power generation efficiency. Summary of the Invention

[0004] The main purpose of the present invention is to provide a gearbox cooling system for a wind turbine generator set, aiming to solve the technical problem of how to ensure the power generation efficiency of the wind turbine generator set.

[0005] To achieve the above-mentioned object, the present invention proposes a gearbox cooling system for a wind turbine generator set, comprising a nacelle, a main shaft, a hub, blades, a gearbox, and a generator, wherein the gearbox and the generator are both disposed in the nacelle, the blades are disposed on the hub, one end of the main shaft is connected to the hub, the other end of the main shaft is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the input shaft of the generator. The gearbox cooling system for a wind turbine generator set further comprises: a first fan blade assembly, the first fan blade assembly being located in the nacelle, the first fan blade assembly being connected to the main shaft so that the main shaft can drive the first fan blade assembly to rotate, the air outlet side of the first fan blade assembly facing the hub when rotating synchronously with the main shaft, and a plurality of heat dissipation vents being provided at one end of the nacelle facing the hub; a heat dissipation mechanism, the heat dissipation mechanism comprising a heat dissipation component, a cooling circulation pipeline, and an oil pump provided on the cooling circulation pipeline, the cooling circulation pipeline comprising an oil inlet section, a heat dissipation section, and an oil return section which are sequentially connected, the oil inlet section being connected to the bottom of the gear box at one end away from the heat dissipation section, the heat dissipation component being connected to the heat dissipation section, and the heat dissipation component being provided on the air outlet side when the first fan blade assembly rotates synchronously with the main shaft, for reducing the temperature of the heat dissipation section; the oil return section being connected to the gear box at one end away from the heat dissipation section, and the oil pump being used to drive the lubricating oil flowing into the oil inlet section to flow through the heat dissipation section and the oil return section in sequence, and then into the gear box; The heat dissipation port faces the air outlet side when the first fan blade assembly rotates synchronously with the main shaft; A heat-conducting mechanism is located outside the nacelle, and includes a heat-conducting ring and a heat-conducting member connected to each other. The heat-conducting ring is connected to the side of the blade close to the hub, and the heat dissipation port faces the heat-conducting ring. The heat-conducting member is attached to the blade and extends along the length direction of the blade. The heat-conducting ring and the heat-conducting member are both made of heat-conducting material.

[0006] In one embodiment, the gearbox cooling system for a wind turbine generator set also includes a switching mechanism and a second blade assembly, the second blade assembly is located in the nacelle, the first blade assembly and the second blade assembly are relatively arranged on both sides of the heat dissipation assembly along the axial direction of the main shaft, the first blade assembly and the second blade assembly are both detachably connected to the main shaft, and the air outlet side of the second blade assembly when rotating synchronously with the main shaft faces away from the hub, the first blade assembly and the second blade assembly are both transmission-connected to the switching mechanism, the switching mechanism can drive the second blade assembly to separate from the main shaft and at the same time drive the first blade assembly to connect to the main shaft so that the first blade assembly and the main shaft rotate synchronously, or the switching mechanism can drive the first blade assembly to separate from the main shaft and at the same time drive the second blade assembly to connect to the main shaft so that the second blade assembly and the main shaft rotate synchronously; a ventilation hole is provided at one end of the nacelle away from the hub.

[0007] In one embodiment, the first fan blade assembly includes a first bearing, a first sleeve and a plurality of first fan blades, the first sleeve is detachably connected to the main shaft, the plurality of first fan blades are arranged at intervals along the circumference of the first sleeve on the outer wall of the first sleeve, the first sleeve is sleeved on the outer wall of the first bearing, the inner hole of the first bearing is for the main shaft to pass through, the inner hole of the first bearing is coaxially arranged with the main shaft and has a clearance fit; the second fan blade assembly includes a second bearing, a second sleeve and a plurality of second fan blades, the second sleeve is detachably connected to the main shaft, the plurality of second fan blades are arranged at intervals along the circumference of the second sleeve on the outer wall of the second sleeve, the second sleeve is sleeved on the outer wall of the second bearing, the inner hole of the second bearing is for the main shaft to pass through, the inner hole of the second bearing is coaxially arranged with the main shaft and has a clearance fit The shaft is set and clearance fits; the switching mechanism includes a drive assembly, a transmission assembly and a guide assembly, the guide assembly extends along the axial direction of the main shaft, the guide assembly is connected to the nacelle, the inner ring of the first bearing and the inner ring of the second bearing are both movably mounted on the guide assembly, so that the first bearing inner ring and the second bearing inner ring can move along the axial direction of the main shaft relative to the guide assembly, the drive assembly is connected to the first bearing inner ring and the second bearing inner ring through the transmission assembly, the drive assembly can drive the first sleeve to connect with the main shaft through the transmission assembly and simultaneously drive the second sleeve to separate from the main shaft, or the drive assembly can drive the first sleeve to separate from the main shaft through the transmission assembly and simultaneously drive the second sleeve to connect with the main shaft.

[0008] In one embodiment, the first sleeve includes a first barrel body and a first insertion section that are connected to each other, a plurality of the first blades are evenly spaced along the circumference of the first barrel body, and the first barrel body is sleeved on the outer wall of the first bearing; the second sleeve includes a second barrel body and a second insertion section that are connected to each other, a plurality of the second blades are evenly spaced along the circumference of the second barrel body, and the second barrel body is sleeved on the outer wall of the second bearing; the main shaft includes a shaft body and a first positioning block and a second positioning block arranged on the side wall of the shaft body, one end of the shaft body is connected to the wheel hub, and the other end of the shaft body is connected to the input shaft of the gear box, the inner hole of the first bearing is for the shaft body to pass through, the inner hole of the first bearing is coaxial with the shaft body and has a clearance fit, and the second bearing The inner hole of the second bearing is coaxially arranged with the shaft and has a clearance fit; the first positioning block is located on the side of the first fan blade assembly away from the second fan blade assembly, and the first positioning block is provided with a first slot for the first insertion segment to be inserted; the second positioning block is located on the side of the second fan blade assembly away from the first fan blade assembly, and the second positioning block is provided with a second slot for the second insertion segment to be inserted; the driving assembly can drive the first insertion segment to be inserted into the first slot through the transmission assembly, and at the same time drive the second insertion segment to be disengaged from the second slot; or, the driving assembly can drive the first insertion segment to be disengaged from the first slot through the transmission assembly, and at the same time drive the second insertion segment to be inserted into the second slot.

[0009] In one embodiment, the transmission assembly includes a fixed seat, a first elastic member, a second elastic member, a first pull rope and a second pull rope, the driving assembly includes a driving motor, one end of the first pull rope is connected to the inner ring of the first bearing, and the other end of the first pull rope is wound around the rotating shaft of the driving motor along the first direction, one end of the second pull rope is connected to the inner ring of the second bearing, and one end of the second pull rope is wound around the rotating shaft of the driving motor along the second direction, and the first direction and the second direction are arranged in opposite directions; the fixed seat is arranged between the first fan blade assembly and the second fan blade assembly, one end of the first elastic member is connected to the inner ring of the first bearing, the other end of the first elastic member is connected to the fixed seat, one end of the second elastic member is connected to the inner ring of the second bearing, and the other end of the second elastic member is connected to the fixed seat.

[0010] In one embodiment, the guide assembly includes a main guide rod, the inner ring of the first bearing is provided with a first slide groove, the inner ring of the second bearing is provided with a second slide groove, the first slide groove and the second slide groove are both slidably matched with the main guide rod, and the notches of the first slide groove and the second slide groove are both set towards the ground.

[0011] In one embodiment, the guide assembly also includes an auxiliary guide rod, the inner ring of the first bearing is further provided with a first guide groove, and the inner ring of the second bearing is further provided with a second guide groove, the first guide groove and the second guide groove are both slidingly matched with the auxiliary guide rod, the number of the auxiliary guide rods is multiple, the first guide grooves are consistent with the number of the auxiliary guide rods and are arranged one-to-one, the second guide grooves are consistent with the number of the auxiliary guide rods and are arranged one-to-one, the multiple first guide grooves are arranged in sequence along the circumference of the first bearing, and the multiple second guide grooves are arranged in sequence along the circumference of the second bearing.

[0012] In one embodiment, the heat-conducting ring includes a ring body and a connector, one end of the connector is connected to the blade, and the other end of the connector is connected to the ring body. The distance between the ring body and the end of the nacelle facing the hub along the axial direction of the main shaft is d, and 15mm≤d≤50mm.

[0013] In one embodiment, the gearbox cooling system for a wind turbine generator set further includes a fan, which is located in the nacelle and is arranged corresponding to the heat dissipation component, with the air outlet side of the fan facing the heat dissipation component.

[0014] In one embodiment, the heat dissipation assembly includes a heat dissipation plate and a plurality of heat dissipation fins, one side of the heat dissipation plate is connected to the heat dissipation section, and the other side of the heat dissipation plate is connected to the plurality of heat dissipation fins, the plurality of heat dissipation fins extend along the axial direction of the main shaft, and the plurality of heat dissipation fins are arranged in sequence at intervals along a direction perpendicular to the axial direction of the main shaft.

[0015] The technical solution of the present invention is to use an oil pump to extract the high-temperature lubricating oil in the gear box through the oil inlet section, and the high-temperature lubricating oil flows to the heat dissipation section through the oil inlet section. Since the heat dissipation section is connected to the heat dissipation component, the heat dissipation section and the heat dissipation component exchange heat, thereby transferring heat to the heat dissipation component, and the heat dissipation component then exchanges heat with the air in the cabin, thereby increasing the temperature of the air near the heat dissipation component; and then connected to the main shaft through the first fan blade assembly, so that the main shaft can also drive the first fan blade assembly to rotate when it rotates. Since the air outlet side of the first fan blade assembly is facing the heat dissipation port and the heat dissipation component, the airflow generated by the first fan blade assembly blows through the heat dissipation component and the heat dissipation port in turn, and the airflow meets the heat dissipation component at the heat dissipation component. The components undergo heat exchange, the airflow heats up, and the heat dissipation components cool down, effectively improving the cooling effect of the heat dissipation section on the lubricating oil. The cooled lubricating oil can provide better lubrication for the components in the gearbox, reduce the resistance to relative motion between the components, reduce the loss of kinetic energy caused by this resistance, and transfer more kinetic energy to the generator, thereby effectively improving the power generation efficiency of the generator; the airflow with rising temperature will flow out of the cabin through the heat dissipation port and blow to the heat transfer ring, and exchange heat with the heat transfer ring, transferring heat to the heat transfer ring, and the heat transfer ring then transfers the heat to the blade through the heat conduction component, thereby increasing the temperature of the blade and assisting the blade in melting ice and snow, thereby providing a guarantee for the power generation efficiency of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of an embodiment of a gearbox cooling system for a wind turbine generator set provided by the present invention without a heat conduction mechanism installed; Figure 2 A schematic diagram of a portion of the structure of an embodiment of a gearbox cooling system for a wind turbine generator set provided by the present invention, equipped with a heat conduction mechanism; Figure 3 A schematic structural diagram of an embodiment of the switching mechanism, the first fan blade assembly, and the second fan blade assembly provided by the present invention; Figure 4 for Figure 3 Structural diagram from another perspective; Figure 5 A schematic diagram of the exploded structure of an embodiment of the switching mechanism and the first and second fan blade assemblies provided by the present invention; Figure 6A schematic structural diagram of an embodiment of a first bearing and a second bearing provided by the present invention; Figure 7 This is a structural diagram of the connection between the heat dissipation mechanism provided by the present invention and the gear box.

[0018] Description of Figure Numbers: 100. Gearbox cooling system for a wind turbine generator set; 1. Nacelle; 11. Heat dissipation vent; 2. Main shaft; 21. Shaft body; 211. First positioning block; 2111. First slot; 212. Second positioning block; 2121. Second slot; 3. Hub; 4. Blade; 5. Gearbox; 6. First blade assembly; 61. First bearing; 611. First slideway; 612. First guide groove; 62. First sleeve; 621. First sleeve body; 622. First insertion section; 63. First blade; 7. Heat dissipation mechanism; 71. Heat dissipation assembly; 711. Heat dissipation plate; 712. Heat dissipation fins; 72. Cooling circulation pipeline; 721. Oil inlet section; 722. Heat dissipation section; 723 , oil return section; 73, oil pump; 8, heat conduction mechanism; 81, heat conduction ring; 811, ring body; 812, connector; 82, heat conduction member; 9, switching mechanism; 91, drive assembly; 911, drive motor; 92, transmission assembly; 921, fixed seat; 922, first elastic member; 923, second elastic member; 924, first pull rope; 925, second pull rope; 93, guide assembly; 931, main guide rod; 932, auxiliary guide rod; 10, second fan blade assembly; 101, second bearing; 1011, second slide groove; 1012, second guide groove; 102, second sleeve; 1021, second cylinder body; 1022, second insertion section; 103, second fan blade.

[0019] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] As the impact of the greenhouse effect becomes increasingly severe, people are increasingly prioritizing clean energy, leading to a growing demand for wind turbines. When wind blows on the blades of existing wind turbines, they drive the connected main shaft to rotate, converting the wind energy into mechanical energy. The main shaft then rotates the rotor inside the generator, which cuts through the magnetic lines of flux in the stator's magnetic field, generating an induced electromotive force (EMF), thereby converting the mechanical energy into electrical energy. This energy can then be transmitted to the power grid or used for other electrical devices.

[0024] Existing wind turbines often experience gearbox overheating, forcing the blade speed to be reduced to maintain normal operation, which seriously affects the wind power generation efficiency; or the blade surface is covered with ice, which reduces the blade speed and seriously affects the wind power generation efficiency.

[0025] The inventors have found that the faster the main shaft speed, the higher the temperature inside the gearbox. The increase in temperature inside the gearbox will lead to a decrease in the viscosity of the lubricating oil, resulting in a thinner lubricating protective film formed between the friction surfaces, a decrease in load-bearing capacity, and an inability to effectively isolate the direct metal contact of components such as gears and bearings, increasing the risk of wear, aggravating tooth surface wear, and causing scratches, pits, broken teeth and other problems, which will cause abnormal noise in the gearbox and seriously affect the life of the gearbox. If the main shaft speed is reduced, the efficiency of wind power generation will be reduced. In addition, the inventors have also found that some areas have frequent rain and snowfall in winter. Wind turbines are generally set up in remote wilderness. If they rely on manual labor to melt ice and snow, it will undoubtedly cost huge manpower costs. If an external thermal energy device is used, since the thermal energy device relies on converting electrical energy into thermal energy, if part of the electricity generated by the wind turbine is used to power the thermal energy device, the power generation capacity of the wind power device will undoubtedly be damaged.

[0026] The present invention provides a gearbox cooling system for a wind turbine generator set, aiming to solve the technical problem of how to ensure the power generation efficiency of the wind turbine generator set.

[0027] See also Figures 1 to 3 as well as Figure 7 In one embodiment of the present invention, the gearbox cooling system 100 for a wind turbine generator set includes a nacelle 1, a main shaft 2, a hub 3, blades 4, a gearbox 5 and a generator. The gearbox 5 and the generator are both arranged in the nacelle 1, the blades 4 are arranged on the hub 3, one end of the main shaft 2 is connected to the hub 3, the other end of the main shaft 2 is connected to the input shaft of the gearbox 5, and the output shaft of the gearbox 5 is connected to the input shaft of the generator. The gearbox cooling system 100 for a wind turbine generator set also includes a first blade assembly 6, a heat dissipation mechanism 7 and a heat conduction mechanism 8. The first blade assembly 6 is located in the nacelle 1 and is connected to the main shaft 2 so that the main shaft 2 can drive the first blade assembly 6 to rotate. When the first blade assembly 6 rotates synchronously with the main shaft 2, the air outlet side faces the hub 3. A plurality of heat dissipation ports 11 are provided at one end of the nacelle 1 facing the hub 3; the heat dissipation mechanism 7 includes a heat dissipation assembly 71, a cooling circulation pipeline 72 and an oil pump 73 arranged on the cooling circulation pipeline 72. The cooling circulation pipeline 72 includes a heat dissipation mechanism 7 according to the embodiment of the present invention. The oil inlet section 721, the heat dissipation section 722 and the oil return section 723 are connected in a secondary manner. The end of the oil inlet section 721 away from the heat dissipation section 722 is connected to the bottom of the gear box 5. The heat dissipation component 71 is connected to the heat dissipation section 722, and the heat dissipation component 71 is arranged on the air outlet side when the first fan blade assembly 6 rotates synchronously with the main shaft 2, so as to reduce the temperature of the heat dissipation section 722; the end of the oil return section 723 away from the heat dissipation section 722 is connected to the gear box 5, and the oil pump 73 is used to drive the lubricating oil flowing into the oil inlet section 721 to flow through the gear box 5 in sequence. The heat dissipation section 722 and the oil return section 723 then flow into the gear box 5; the heat dissipation port 11 faces the air outlet side when the first fan blade assembly 6 rotates synchronously with the main shaft 2; the heat conduction mechanism 8 is located outside the cabin 1, and the heat conduction mechanism 8 includes a heat conduction ring 81 and a heat conduction member 82 that are connected to each other. The heat conduction ring 81 is connected to the side of the blade 4 close to the hub 3, and the heat dissipation port 11 faces the heat conduction ring 81, and the heat conduction member 82 is attached to the blade 4 and extends along the length direction of the blade 4. The heat conduction ring 81 and the heat conduction member 82 are both made of heat conductive materials.

[0028] The technical solution of the present invention uses the oil pump 73 to extract the high-temperature lubricating oil in the gear box 5 through the oil inlet section 721, and the high-temperature lubricating oil flows to the heat dissipation section 722 through the oil inlet section 721. Since the heat dissipation section 722 is connected to the heat dissipation component 71, the lubricating oil in the heat dissipation section 722 exchanges heat with the heat dissipation component 71, thereby transferring the heat to the heat dissipation component 71, and the heat dissipation component 71 then exchanges heat with the air in the cabin 1, thereby increasing the temperature of the air near the heat dissipation component 71; and then connected to the main shaft 2 through the first fan blade assembly 6, so that the main shaft 2 can also drive the first fan blade assembly 6 to rotate when it rotates. Since the air outlet side of the first fan blade assembly 6 is facing the heat dissipation port 11 and the heat dissipation component 71, the airflow generated by the first fan blade assembly 6 blows through the heat dissipation component 71 and the heat dissipation port 11 in turn, and the airflow exchanges heat with the heat dissipation component 71 at the heat dissipation component 71, the airflow heats up, and the heat dissipation component 71 cools down, effectively improving the cooling of the lubricating oil by the heat dissipation section 722. The cooling lubricating oil can not only provide better lubrication effect for the components in the gearbox 5, reduce the resistance to relative movement between the components, reduce the loss of kinetic energy caused by this resistance, and transfer more kinetic energy to the generator, thereby effectively improving the power generation efficiency of the generator, but also can exchange heat with the components in the gearbox 5, thereby reducing the temperature of the gearbox 5 and extending the life of the gearbox 5; the airflow with rising temperature will flow to the heat dissipation port 11 and out of the nacelle 1 through the heat dissipation port 11 and blow to the heat transfer ring 81, and then exchange heat with the heat transfer ring 81, the airflow transfers heat to the heat transfer ring 81, and the heat transfer ring 81 transfers heat to the blade 4 through the heat conductor 82, thereby increasing the temperature of the blade 4, and assisting in melting ice or snow on the surface of the blade 4, thereby reducing the load of ice and snow on the blade 4, and increasing the rotation speed of the blade 4 under the same wind volume, thereby improving the power generation efficiency of the wind turbine generator set, and providing a guarantee for the power generation efficiency of the wind turbine generator set. It should be noted that the main shaft 2 of the gearbox cooling system 100 for a wind turbine generator set of this embodiment can only rotate in a single direction and cannot rotate forward or reverse, that is, if the main shaft 2 rotates in the clockwise direction, then the main shaft 2 cannot rotate counterclockwise. Therefore, the rotation direction of the main shaft 2 is determined, and the air outlet side of the first fan blade assembly 6 is also determined, thereby ensuring that the airflow blown out from the air outlet side can flow smoothly to the heat dissipation port 11. It should also be noted that the oil pump 73 is an existing oil pump 73, the cooling circulation pipeline 72 can adopt an existing oil pipeline, and the oil pump 73 can be installed on the cooling circulation pipeline 72 using existing installation means, so that the oil pump 73 can drive the lubricating oil in the gearbox 5 to flow through the oil inlet section 721, the heat dissipation section 722 and the oil return section 723 in sequence and then return to the gearbox 5; the heat conductive ring 81 and the heat conductive member 82 can be made of metal materials with high thermal conductivity, such as copper or aluminum, etc., and are not specifically limited here.

[0029] See also Figures 3 to 5In one embodiment, the gearbox cooling system 100 for a wind turbine generator set further includes a switching mechanism 9 and a second blade assembly 10. The second blade assembly 10 is located in the nacelle 1. The first blade assembly 6 and the second blade assembly 10 are relatively arranged on both sides of the heat dissipation assembly 71 along the axial direction of the main shaft 2. The first blade assembly 6 and the second blade assembly 10 are both detachably connected to the main shaft 2. When the second blade assembly 10 rotates synchronously with the main shaft 2, the air outlet side faces away from the hub 3. The first blade assembly 6 and the second blade assembly 10 are both transmission-connected to the switching mechanism 9. The switching mechanism 9 can drive the second blade assembly 10 to separate from the main shaft 2 and simultaneously drive the first blade assembly 6 to connect to the main shaft 2 so that the first blade assembly 6 and the main shaft 2 rotate synchronously, or the switching mechanism 9 can drive the first blade assembly 6 to separate from the main shaft 2 and simultaneously drive the second blade assembly 10 to connect to the main shaft 2 so that the second blade assembly 10 and the main shaft 2 rotate synchronously; a ventilation hole is provided at one end of the nacelle 1 away from the hub 3.

[0030] The inventors have also found that if the first fan blade assembly 6 is always connected to the main shaft 2, although the heat generated by the gear box 5 can be used to melt ice and snow on the blades 4 in the cold winter, as the seasons change and the hot summer comes, if the heat generated by the gear box 5 is still transferred to the blades 4, the blades 4 may be deformed by the heat, thereby reducing the rotation speed of the blades 4 and affecting the power generation efficiency.

[0031] This embodiment adds a switching structure and a second fan blade assembly 10, so that in summer, the first fan blade assembly 6 can be separated from the main shaft 2 through the switching structure, so that the main shaft 2 will no longer drive the first fan blade assembly 6 to rotate. At the same time, in order to maintain efficient cooling of the gear box 5, the switching structure separates the first fan blade assembly 6 from the main shaft 2, and the second fan blade assembly 10 will be connected to the main shaft 2, and the main shaft 2 can drive the second fan blade assembly 10 to rotate. Since the direction of the air outlet side when the second fan blade assembly 10 rotates synchronously with the main shaft 2 is opposite to the direction of the air outlet side when the first fan blade assembly 6 and the main shaft 2 rotate synchronously, the air flow enters from the heat dissipation port 11 instead of being blown out from the heat dissipation port 11, avoiding blowing high-temperature airflow into the heat transfer mechanism 8, thereby avoiding the phenomenon that the blade 4 is deformed due to the hot air flow blown out from the heat dissipation port 11, providing a guarantee for the power generation efficiency of the wind turbine generator set.

[0032] Moreover, since the air outlet side of the second fan blade assembly 10 is also facing the heat dissipation assembly 71, the airflow entering the cabin 1 from the heat dissipation port 11 will be blown toward the heat dissipation assembly 71 under the drive of the second fan blade assembly 10, thereby accelerating the air flow rate around the heat dissipation assembly 71 and reducing the temperature of the heat dissipation assembly 71 more quickly, thereby effectively reducing the temperature of the lubricating oil in the heat dissipation section 722, so that the cooled lubricating oil can not only provide better lubrication effect for the components in the gearbox 5, but also reduce the resistance to relative movement between the components, reduce the loss of kinetic energy due to this part of the resistance, and transfer more kinetic energy to the generator, thereby effectively improving the power generation efficiency of the generator and providing a guarantee for the power generation efficiency of the generator; the airflow that completes the heat exchange with the heat dissipation assembly 71 will be discharged to the outside of the cabin 1 through the ventilation hole. Since the ventilation hole is arranged at the end of the cabin 1 away from the hub 3, the heat generated by this part of the airflow will basically have no effect on the blade 4, so that the blade 4 is not easily deformed by heat and affects the power generation efficiency.

[0033] See also Figures 3 to 5In one embodiment, the first fan blade assembly 6 includes a first bearing 61, a first sleeve 62, and a plurality of first fan blades 63. The first sleeve 62 is detachably connected to the main shaft 2. The plurality of first fan blades 63 are arranged on the outer wall of the first sleeve 62 at intervals along the circumference of the first sleeve 62. The first sleeve 62 is sleeved on the outer wall of the first bearing 61. The inner hole of the first bearing 61 is for the main shaft 2 to pass through. The inner hole of the first bearing 61 is coaxially arranged with the main shaft 2 and has a clearance fit; the second fan blade assembly 10 includes a second bearing 101, a second sleeve 102, and a plurality of second fan blades 103. The second sleeve 102 is detachably connected to the main shaft 2. The plurality of second fan blades 103 are arranged on the outer wall of the second sleeve 102 at intervals along the circumference of the second sleeve 102. The second sleeve 102 is sleeved on the outer wall of the second bearing 101. The inner hole of the second bearing 101 is for the main shaft 2 to pass through. The inner hole of the second bearing 101 The hole is coaxially arranged with the main shaft 2 and has clearance fit; the switching mechanism 9 includes a drive assembly 91, a transmission assembly 92 and a guide assembly 93. The guide assembly 93 extends along the axial direction of the main shaft 2. The guide assembly 93 is connected to the cabin 1. The inner ring of the first bearing 61 and the inner ring of the second bearing 101 can be movably installed on the guide assembly 93, so that the inner ring of the first bearing 61 and the inner ring of the second bearing 101 can move along the axial direction of the main shaft 2 relative to the guide assembly 93. The drive assembly 91 is connected to the inner ring of the first bearing 61 and the inner ring of the second bearing 101 through the transmission assembly 92. The drive assembly 91 can drive the first sleeve 62 to connect with the main shaft 2 through the transmission assembly 92 and simultaneously drive the second sleeve 102 to separate from the main shaft 2, or the drive assembly 91 can drive the first sleeve 62 to separate from the main shaft 2 through the transmission assembly 92 and simultaneously drive the second sleeve 102 to connect with the main shaft 2.Among them, the driving assembly 91 drives the first bearing 61 and the second bearing 101 to move relative to the guide assembly 93 through the transmission assembly 92, thereby driving the first sleeve 62 to move through the first bearing 61, and driving the second sleeve 102 to move through the second bearing 101. When the first sleeve 62 is connected to the main shaft 2, since the first sleeve 62 is sleeved on the outer wall of the first bearing 61, the inner hole of the first bearing 61 is coaxially arranged with the main shaft 2 and the clearance fit is matched, so that the rotation of the main shaft 2 will not drive the inner ring of the first bearing 61 to rotate, ensuring the reliability of the connection between the inner ring of the first bearing 61 and the guide assembly 93; at the same time, it also ensures that the first sleeve 62 is also coaxially arranged with the main shaft 2, thereby ensuring the stability of the synchronous rotation of the first sleeve 62 and the main shaft 2, so that the first sleeve 62 can be stable It drives the first fan blade 63 arranged thereon to move, thereby generating an airflow blowing toward the hub 3; when the first sleeve 62 is separated from the main shaft 2 and the second sleeve 102 is connected to the main shaft 2, since the second sleeve 102 is sleeved on the outer wall of the second bearing 101, the inner hole of the second bearing 101 is coaxially arranged with the main shaft 2 and the clearance fit, so that the rotation of the main shaft 2 will not drive the inner ring of the second bearing 101 to rotate, ensuring the reliability of the connection between the inner ring of the second bearing 101 and the guide assembly 93; at the same time, it also ensures that the second sleeve 102 is also coaxially arranged with the main shaft 2, thereby ensuring the stability of the synchronous rotation of the second sleeve 102 and the main shaft 2, so that the second sleeve 102 can stably drive the second fan blade 103 arranged thereon to move, thereby generating an airflow blowing toward the heat dissipation assembly 71. It should be noted that the first bearing 61 and the second bearing 101 are both existing bearings, the first blade 63 and the second blade 103 are also existing blades, and the bearing is divided into an inner ring and an outer ring. The outer wall of the bearing mentioned here refers to the outer wall of the outer ring of the bearing. It should also be noted that if the first sleeve 62 rotates clockwise when connected to the main shaft 2, then after the first sleeve 62 is separated from the main shaft 2, the second sleeve 102 is connected to the main shaft 2, and the second sleeve 102 also rotates clockwise. Due to the different shapes of the first blade 63 and the second blade 103, although the first sleeve 62 and the second sleeve 102 both rotate clockwise, their air outlet directions are different; and when the first sleeve 62 is separated from the main shaft 2 and the second sleeve 102 is connected to the main shaft 2, the airflow generated by the second blade 103 may drive the first blade 63 to move, and then drive the first sleeve 62 to rotate counterclockwise, so that the airflow generated by the first blade 63 is consistent with the airflow actively generated by the second blade 103.

[0034] See also Figures 4 to 6In one embodiment, the first sleeve 62 includes a first cylinder body 621 and a first insertion section 622 connected to each other, a plurality of first fan blades 63 are evenly spaced along the circumference of the first cylinder body 621, and the first cylinder body 621 is sleeved on the outer wall of the first bearing 61; the second sleeve 102 includes a second cylinder body 1021 and a second insertion section 1022 connected to each other, a plurality of second fan blades 103 are evenly spaced along the circumference of the second cylinder body 1021, and the second cylinder body 1021 is sleeved on the outer wall of the second bearing 101; the main shaft 2 includes a shaft body 21 and a first positioning block 211 and a second positioning block 212 arranged on the side wall of the shaft body 21, one end of the shaft body 21 is connected to the wheel hub 3, and the other end of the shaft body 21 is connected to the input shaft of the gearbox 5, the inner hole of the first bearing 61 is for the shaft body 21 to pass through, the inner hole of the first bearing 61 is coaxial with the shaft body 21 and has a clearance fit, and the second bearing 10 1 is for the shaft body 21 to pass through, and the inner hole of the second bearing 101 is coaxially arranged with the shaft body 21 and has a clearance fit; the first positioning block 211 is located on the side of the first fan blade assembly 6 away from the second fan blade assembly 10, and the first positioning block 211 has a first slot 2111 for the first insertion section 622 to be inserted, and the second positioning block 212 is located on the side of the second fan blade assembly 10 away from the first fan blade assembly 6, and the second positioning block 212 has a second slot 2121 for the second insertion section 1022 to be inserted, and the driving component 91 can drive the first insertion section 622 to be inserted into the first slot 2111 through the transmission component 92, and at the same time drive the second insertion section 1022 to be disengaged from the second slot 2121; or, the driving component 91 can drive the first insertion section 622 to be disengaged from the first slot 2111 through the transmission component 92, and at the same time drive the second insertion section 1022 to be inserted into the second slot 2121. Among them, the driving assembly 91 is used to drive the first barrel body 621 and the second barrel body 1021 to move through the transmission assembly 92. When the first insertion section 622 on the first barrel body 621 is inserted into the first slot 2111, the second insertion section 1022 on the second barrel body 1021 is disengaged from the second slot 2121, so that the main shaft 2 will only drive the first barrel body 621 to rotate, thereby generating an airflow blowing toward the heat dissipation outlet 11; when the driving assembly 91 drives the first insertion section 622 on the first barrel body 621 to disengage from the first slot 2111, the second insertion section 1022 on the second barrel body 1021 is inserted into the second slot 2121, so that the main shaft 2 will only drive the second barrel body 1021 to rotate, thereby generating wind blowing toward the ventilation hole; the first insertion section 622 and the first slot 2111 are plugged in and matched, and the second insertion section 1022 and the second slot 2121 are plugged in and matched, thereby easily realizing the detachable connection between the first sleeve 62 and the main shaft 2, and easily realizing the detachable connection between the second sleeve 102 and the main shaft 2.

[0035] According to one embodiment of the present invention, slots are provided on the first sleeve 62 and the second sleeve 102, and a first pin for inserting into the slot of the first sleeve 62 is provided on the main shaft 2. A second pin for inserting into the slot on the second sleeve 102 is also provided on the main shaft 2. Through the plug-in cooperation of the slots and the pins, it is also easy to achieve a detachable connection between the first sleeve 62 and the main shaft 2, and it is also easy to achieve a detachable connection between the second sleeve 102 and the main shaft 2.

[0036] See also Figures 3 to 5In one embodiment, the transmission assembly 92 includes a fixed seat 921, a first elastic member 922, a second elastic member 923, a first pull rope 924 and a second pull rope 925, the driving assembly 91 includes a driving motor 911, one end of the first pull rope 924 is connected to the inner ring of the first bearing 61, and the other end of the first pull rope 924 is wound around the rotating shaft of the driving motor 911 along the first direction, one end of the second pull rope 925 is connected to the inner ring of the second bearing 101, and one end of the second pull rope 925 is wound around the rotating shaft of the driving motor 911 along the second direction, and the first direction and the second direction are arranged in opposite directions; the fixed seat 921 is arranged between the first fan blade assembly 6 and the second fan blade assembly 10, one end of the first elastic member 922 is connected to the inner ring of the first bearing 61, the other end of the first elastic member 922 is connected to the fixed seat 921, one end of the second elastic member 923 is connected to the inner ring of the second bearing 101, and the other end of the second elastic member 923 is connected to the fixed seat 921. When the driving motor 911 rotates in the first direction, the length of the first pull rope 924 wound on the rotating shaft of the driving motor 911 decreases, and the length of the second pull rope 925 on the rotating shaft of the driving motor 911 increases. Since the length of the first pull rope 924 wound on the rotating shaft decreases, the first elastic member 922 in a compressed state can drive the first bearing 61 to move left relative to the guide assembly 93. At the same time, since the length of the second pull rope 925 on the rotating shaft of the driving motor 911 increases, the second bearing 101 connected to the second pull rope 925 is dragged to move left together, continuously squeezing the second elastic member 923 until the first insertion section 622 moving left is inserted into the first slot 2111, and moves left. The second insertion section 1022 moves until it disengages from the second slot 2121; when the drive motor 911 rotates along the second direction, the length of the first pull rope 924 wound around the rotating shaft of the drive motor 911 gradually increases, and the length of the second pull rope 925 wound around the rotating shaft of the drive motor 911 gradually decreases. The first pull rope 924 drags the first bearing 61 to move to the right, thereby driving the second insertion section 1022 to move to the right, and the second elastic member 923 in a compressed state will drive the second bearing 101 to move to the right relative to the guide assembly 93, thereby driving the second insertion section 1022 to move to the right, until the second insertion section 1022 is inserted into the second slot 2121, and the first insertion section 622 is disengaged from the first slot 2111.It should be noted that even if the second insertion section 1022 is separated from the second slot 2121, the first insertion section 622 fails to align with the first slot 2111, resulting in the end of the first insertion section 622 away from the first cylinder body 621 abutting against the end of the first positioning block 211 facing the first cylinder body 621. Since the first elastic member 922 is in a compressed state, as long as the first slot 2111 is rotated to a position facing the first insertion section 622, the elastic force generated by the first elastic member 922 can drive the first insertion section 622 to insert into the first slot 2111. 111, thereby providing an effective guarantee for the first insertion section 622 to be able to be smoothly inserted into the first slot 2111; similarly, even if the second insertion section 1022 fails to be smoothly inserted into the second slot 2121 for the first time, since the second elastic member 923 is in a compressed state, when the second slot 2121 moves to the position corresponding to the second insertion section 1022, the elastic force generated by the second elastic member 923 will also drive the second insertion section 1022 to be inserted into the second slot 2121, providing a guarantee for the second insertion section 1022 to be able to be smoothly inserted into the second slot 2121. It should also be noted that the drive motor 911 can be an existing stepper motor or servo motor, and no specific restrictions are made here; the first pull rope 924 and the second pull rope 925 are both existing pull ropes, and the first elastic member 922 and the second elastic member 923 can be springs or rubber blocks or other structural members with elastic deformation capabilities, and no specific restrictions are made here. Among them, the first direction can be clockwise or counterclockwise, and there is no limitation here. When the first direction is clockwise, the second direction is counterclockwise, and the axial direction of the main shaft 2 is. Figure 3 Left and right directions shown.

[0037] See also Figures 4 to 6 In one embodiment, the guide assembly 93 includes a main guide rod 931. The inner ring of the first bearing 61 defines a first slot 611, and the inner ring of the second bearing 101 defines a second slot 1011. The first slot 611 and the second slot 1011 both slidably engage with the main guide rod 931, with the notches of the first slot 611 and the second slot 1011 facing the ground. By providing the main guide rod 931, which passes through the first slot 611 and the second slot 1011, respectively, it not only guides the movement of the first bearing 61 and the second bearing 101 but also provides reliable support for the first bearing 61 and the second bearing 101. Both ends of the main guide rod 931 may be connected to the inner wall of the nacelle 1 or other immovable structural members within the nacelle 1, without specific limitation herein.

[0038] See also Figures 4 to 6In one embodiment, the guide assembly 93 further includes an auxiliary guide rod 932, the inner ring of the first bearing 61 further includes a first guide groove 612, and the inner ring of the second bearing 101 further includes a second guide groove 1012. The first guide groove 612 and the second guide groove 1012 both slide in cooperation with the auxiliary guide rod 932. There are multiple auxiliary guide rods 932, the number of the first guide grooves 612 is consistent with the number of the auxiliary guide rods 932 and is arranged in one-to-one correspondence, the number of the second guide grooves 1012 is consistent with the number of the auxiliary guide rods 932 and is arranged in one-to-one correspondence, the multiple first guide grooves 612 are arranged in sequence along the circumference of the first bearing 61, and the multiple second guide grooves 1012 are arranged in sequence along the circumference of the second bearing 101. By setting up multiple auxiliary guide rods 932, each auxiliary guide rod 932 passes through the corresponding first guide groove 612 and second guide groove 1012, thereby further strengthening the guiding effect on the first bearing 61 and the second bearing 101, and realizing effective positioning of the inner ring of the first bearing 61 and the inner ring of the second bearing 101, limiting the rotation of the inner ring of the first bearing 61 and the inner ring of the second bearing 101 relative to the main shaft 2.

[0039] See also Figure 2 In one embodiment, the heat-conducting ring 81 includes a ring body 811 and a connector 812, one end of the connector 812 is connected to the blade 4, and the other end of the connector 812 is connected to the ring body 811. The distance between the ring body 811 and the end of the nacelle 1 facing the hub 3 along the axial direction of the main shaft 2 is d, 15mm≤d≤50mm. By controlling the distance between the ring body 811 and the end of the nacelle 1 where the heat dissipation 11 is provided, the airflow blown out from the air outlet can contact the ring body 811 as much as possible and quickly to exchange heat, thereby reducing the interference of other airflows on the airflow blown out from the heat dissipation 11. The reason why the ring body 811 is not completely covered on the end of the nacelle 1 where the heat dissipation 11 is provided is mainly because when the first fan blade assembly 6 needs to stop rotating and the second fan blade assembly 10 rotates, the heat dissipation 11 can be used as an air inlet. If the heat dissipation 11 is blocked, it will result in the inability to inlet air from the heat dissipation 11, and thus it will be impossible to form an airflow channel to accelerate the heat dissipation of the heat dissipation assembly 71. Therefore, the ring body 811 cannot be abutted against the nacelle 1. The connecting member 812 is also made of heat-conducting material. The connecting member 812 can be a connecting rod or a connecting block, etc., which is not specifically limited here.

[0040] In one embodiment, the gearbox cooling system 100 for a wind turbine generator set further includes a fan (not shown). The fan is located within the nacelle 1 and is disposed corresponding to the heat sink assembly 71, with its outlet facing the heat sink assembly 71. By adding a fan to dissipate heat from the heat sink assembly 71, the air velocity around the heat sink assembly 71 is increased, effectively improving the heat dissipation efficiency of the heat sink assembly 71. Furthermore, if the fan's outlet faces the hub 3, it can assist the first blade assembly 6 in directing the hot airflow that has exchanged heat with the heat sink assembly 71 from the heat dissipation port 11 toward the ring body 811, thereby improving heat transfer efficiency and enhancing the effect of melting ice and snow on the blades 4. If the fan's outlet faces away from the hub 3, the fan can assist the second blade assembly 10 in dissipating heat from the heat sink assembly 71, thereby enhancing the heat dissipation efficiency of the lubricating oil within the heat sink section 722. The cooled lubricating oil not only provides better lubrication for the components within the gearbox 5 but also reduces the resistance to relative motion between the components, thereby reducing the loss of kinetic energy due to this resistance, allowing more kinetic energy to be transferred to the generator, thereby effectively improving the generator's power generation efficiency. The fan may be an existing fan, and the fan may be powered by an external power supply or a battery, which is not specifically limited here.

[0041] See also Figure 4 In one embodiment, the heat dissipation assembly 71 includes a heat dissipation plate 711 and a plurality of heat dissipation fins 712. One side of the heat dissipation plate 711 is connected to the heat dissipation section 722, and the other side of the heat dissipation plate 711 is connected to the plurality of heat dissipation fins 712. The plurality of heat dissipation fins 712 extend along the axial direction of the main shaft 2, and the plurality of heat dissipation fins 712 are arranged in sequence at intervals along a direction perpendicular to the axial direction of the main shaft 2. By setting up multiple cooling fins 712, the contact area between the cooling assembly 71 and the air is increased, thereby improving the cooling efficiency of the cooling assembly 71, thereby improving the cooling effect of the lubricating oil in the cooling section 722. The cooled lubricating oil can not only provide better lubrication effect for the components in the gear box 5, but also reduce the resistance to relative movement between the components, reduce the loss of kinetic energy caused by this part of the resistance, and transfer more kinetic energy to the generator, thereby effectively improving the power generation efficiency of the generator; and each first cooling fin 712 extends along the axial direction of the main shaft 2, and multiple cooling fins 712 are arranged in sequence at intervals along the direction perpendicular to the axial direction of the main shaft 2, which enables a cooling air duct extending along the axial direction of the main shaft 2 to be formed between two adjacent cooling fins 712, which facilitates the passage of airflow, thereby effectively enhancing the heat dissipation capacity of the cooling assembly 71.

[0042] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A gearbox cooling system for a wind turbine generator set, comprising a nacelle (1), a main shaft (2), a hub (3), blades (4), a gearbox (5) and a generator, wherein the gearbox (5) and the generator are both arranged in the nacelle (1), the blades (4) are arranged on the hub (3), one end of the main shaft (2) is connected to the hub (3), the other end of the main shaft (2) is connected to the input shaft of the gearbox (5), and the output shaft of the gearbox (5) is connected to the input shaft of the generator, characterized in that The gearbox cooling system (100) for a wind turbine generator set further comprises: a first fan blade assembly (6), the first fan blade assembly (6) being located in the nacelle (1), the first fan blade assembly (6) being connected to the main shaft (2) so that the main shaft (2) can drive the first fan blade assembly (6) to rotate, the air outlet side of the first fan blade assembly (6) facing the hub (3) when rotating synchronously with the main shaft (2), and a plurality of heat dissipation openings being provided at one end of the nacelle (1) facing the hub (3); A heat dissipation mechanism (7), the heat dissipation mechanism (7) comprising a heat dissipation component (71), a cooling circulation pipeline (72), and an oil pump (73) arranged on the cooling circulation pipeline (72); the cooling circulation pipeline (72) comprising an oil inlet section (721), a heat dissipation section (722), and an oil return section (723) which are connected in sequence; an end of the oil inlet section (721) away from the heat dissipation section (722) is connected to the bottom of the gear box (5); the heat dissipation component (71) and the heat dissipation section (72) are connected to each other. 2) is connected, and the heat dissipation component (71) is arranged on the air outlet side when the first fan blade component (6) and the main shaft (2) rotate synchronously, and is used to reduce the temperature of the heat dissipation section (722); the end of the oil return section (723) away from the heat dissipation section (722) is connected to the gear box (5), and the oil pump (73) is used to drive the lubricating oil flowing into the oil inlet section (721) to flow through the heat dissipation section (722) and the oil return section (723) in sequence and then flow into the gear box (5); The heat dissipation port faces the air outlet side when the first fan blade assembly (6) rotates synchronously with the main shaft (2); A heat-conducting mechanism (8), the heat-conducting mechanism (8) is located outside the cabin (1), the heat-conducting mechanism (8) comprises a heat-conducting ring (81) and a heat-conducting member (82) connected to each other, the heat-conducting ring (81) is connected to a side of the blade (4) close to the hub (3), the heat dissipation port faces the heat-conducting ring (81), the heat-conducting member (82) is attached to the blade (4) and extends along the length direction of the blade (4), and the heat-conducting ring (81) and the heat-conducting member (82) are both made of heat-conducting material.

2. The gearbox cooling system for a wind turbine generator set according to claim 1, wherein: The gearbox cooling system (100) for a wind turbine generator set further comprises a switching mechanism (9) and a second blade assembly (10), wherein the second blade assembly (10) is located in the nacelle (1), the first blade assembly (6) and the second blade assembly (10) are arranged on opposite sides of the heat dissipation assembly (71) along the axial direction of the main shaft (2), the first blade assembly (6) and the second blade assembly (10) are both detachably connected to the main shaft (2), the air outlet side of the second blade assembly (10) when rotating synchronously with the main shaft (2) faces a direction away from the hub (3), and the first blade assembly (6) and the second blade assembly (10) are arranged on opposite sides of the heat dissipation assembly (71) along the axial direction of the main shaft (2). The components (10) are all connected to the switching mechanism (9) in a transmission manner. The switching mechanism (9) can drive the second blade assembly (10) to separate from the main shaft (2) and simultaneously drive the first blade assembly (6) to connect to the main shaft (2) so that the first blade assembly (6) and the main shaft (2) rotate synchronously. Alternatively, the switching mechanism (9) can drive the first blade assembly (6) to separate from the main shaft (2) and simultaneously drive the second blade assembly (10) to connect to the main shaft (2) so that the second blade assembly (10) and the main shaft (2) rotate synchronously. A ventilation hole is provided at one end of the cabin (1) away from the hub (3).

3. The gearbox cooling system for a wind turbine generator set according to claim 2, wherein: The first fan blade assembly (6) includes a first bearing (61), a first sleeve (62) and a plurality of first fan blades (63). The first sleeve (62) is detachably connected to the main shaft (2). The plurality of first fan blades (63) are arranged on the outer wall of the first sleeve (62) at intervals along the circumference of the first sleeve (62). The first sleeve (62) is sleeved on the outer wall of the first bearing (61). The inner hole of the first bearing (61) is for the main shaft (2) to pass through. The inner hole of the first bearing (61) is coaxially arranged with the main shaft (2) and has a clearance fit. The two-blade assembly (10) includes a second bearing (101), a second sleeve (102), and a plurality of second blades (103). The second sleeve (102) is detachably connected to the main shaft (2). The plurality of second blades (103) are arranged on the outer wall of the second sleeve (102) at intervals along the circumference of the second sleeve (102). The second sleeve (102) is sleeved on the outer wall of the second bearing (101). The inner hole of the second bearing (101) is for the main shaft (2) to pass through. The inner hole of the second bearing (101) is coaxially arranged with the main shaft (2). and clearance fit; the switching mechanism (9) includes a driving assembly (91), a transmission assembly (92) and a guide assembly (93), the guide assembly (93) extending along the axial direction of the main shaft (2), the guide assembly (93) being connected to the nacelle (1), the inner ring of the first bearing (61) and the inner ring of the second bearing (101) being movably mounted on the guide assembly (93), so that the inner ring of the first bearing (61) and the inner ring of the second bearing (101) can move relative to the guide assembly (93) along the axial direction of the main shaft (2), the driving assembly The component (91) is connected to the inner ring of the first bearing (61) and the inner ring of the second bearing (101) through the transmission component (92); the driving component (91) can drive the first sleeve (62) to connect with the main shaft (2) and simultaneously drive the second sleeve (102) to separate from the main shaft (2); or the driving component (91) can drive the first sleeve (62) to separate from the main shaft (2) and simultaneously drive the second sleeve (102) to connect with the main shaft (2) through the transmission component (92).

4. The gearbox cooling system for a wind turbine generator set according to claim 3, wherein: The first sleeve (62) includes a first sleeve body (621) and a first insertion section (622) connected to each other, and a plurality of the first blades (63) are evenly spaced along the circumference of the first sleeve body (621), and the first sleeve body (621) is sleeved on the outer wall of the first bearing (61); the second sleeve (102) includes a second sleeve body (1021) and a second insertion section (1022) connected to each other, and a plurality of the second blades (103) are evenly spaced along the circumference of the second sleeve body (1021), and the second sleeve body (1021) is sleeved on the outer wall of the first bearing (61); ) is sleeved on the outer wall of the second bearing (101); the main shaft (2) includes a shaft body (21) and a first positioning block (211) and a second positioning block (212) arranged on the side wall of the shaft body (21); one end of the shaft body (21) is connected to the wheel hub (3), and the other end of the shaft body (21) is connected to the input shaft of the gear box (5); the inner hole of the first bearing (61) is for the shaft body (21) to pass through, the inner hole of the first bearing (61) is coaxially arranged with the shaft body (21) and has a clearance fit, and the inner hole of the second bearing (101) is for the The shaft (21) passes through, and the inner hole of the second bearing (101) is coaxially arranged with the shaft (21) and has clearance fit; the first positioning block (211) is located on the side of the first blade assembly (6) away from the second blade assembly (10), and the first positioning block (211) is provided with a first slot (2111) for the first insertion section (622) to be inserted; the second positioning block (212) is located on the side of the second blade assembly (10) away from the first blade assembly (6), and the second positioning block (212) is provided with a first slot (2111) for the second insertion section (1 022) is inserted into the second slot (2121), the driving component (91) can drive the first insertion section (622) to be inserted into the first slot (2111) through the transmission component (92), and at the same time drive the second insertion section (1022) to be disengaged from the second slot (2121); or, the driving component (91) can drive the first insertion section (622) to be disengaged from the first slot (2111) through the transmission component (92), and at the same time drive the second insertion section (1022) to be inserted into the second slot (2121).

5. The gearbox cooling system for a wind turbine generator set according to claim 3, wherein: The transmission assembly (92) includes a fixed seat (921), a first elastic member (922), a second elastic member (923), a first pull rope (924) and a second pull rope (925), and the driving assembly (91) includes a driving motor (911), one end of the first pull rope (924) is connected to the inner ring of the first bearing (61), and the other end of the first pull rope (924) is wound around the rotating shaft of the driving motor (911) along the first direction, and one end of the second pull rope (925) is connected to the inner ring of the second bearing (101), and one end of the second pull rope (925) is wound around the rotating shaft of the driving motor (911) along the second direction. The first direction and the second direction are arranged in opposite directions around the rotating shaft of the driving motor (911); the fixing seat (921) is arranged between the first fan blade assembly (6) and the second fan blade assembly (10); one end of the first elastic member (922) is connected to the inner ring of the first bearing (61), and the other end of the first elastic member (922) is connected to the fixing seat (921); one end of the second elastic member (923) is connected to the inner ring of the second bearing (101), and the other end of the second elastic member (923) is connected to the fixing seat (921).

6. The gearbox cooling system for a wind turbine generator set according to claim 3, wherein: The guide assembly (93) includes a main guide rod (931), the inner ring of the first bearing (61) is provided with a first slide groove (611), the inner ring of the second bearing (101) is provided with a second slide groove (1011), the first slide groove (611) and the second slide groove (1011) are both slidably matched with the main guide rod (931), and the notches of the first slide groove (611) and the second slide groove (1011) are both arranged to face the ground.

7. The gearbox cooling system for a wind turbine generator set according to claim 6, wherein: The guide assembly (93) further includes an auxiliary guide rod (932), the inner ring of the first bearing (61) further includes a first guide groove (612), the inner ring of the second bearing (101) further includes a second guide groove (1012), the first guide groove (612) and the second guide groove (1012) both slide in cooperation with the auxiliary guide rod (932), the number of the auxiliary guide rods (932) is multiple, the number of the first guide grooves (612) and the number of the auxiliary guide rods (932) are consistent and are arranged in a one-to-one correspondence, the number of the second guide grooves (1012) and the number of the auxiliary guide rods (932) are consistent and are arranged in a one-to-one correspondence, the multiple first guide grooves (612) are arranged in sequence along the circumference of the first bearing (61), and the multiple second guide grooves (1012) are arranged in sequence along the circumference of the second bearing (101).

8. The gearbox cooling system for a wind turbine generator set according to any one of claims 1 to 7, characterized in that: The heat-conducting ring (81) comprises a ring body (811) and a connecting piece (812), one end of the connecting piece (812) is connected to the blade (4), and the other end of the connecting piece (812) is connected to the ring body (811), and a distance d between the ring body (811) and one end of the nacelle (1) facing the hub (3) along the axial direction of the main shaft (2) is 15 mm ≤ d ≤ 50 mm.

9. The gearbox cooling system for a wind turbine generator set according to any one of claims 1 to 7, characterized in that: The gearbox cooling system (100) for a wind turbine generator set further comprises a fan, the fan being located in the nacelle (1), the fan being arranged corresponding to the heat dissipation component (71), and the air outlet side of the fan being directed toward the heat dissipation component (71).

10. The gearbox cooling system for a wind turbine generator set according to any one of claims 1 to 7, characterized in that: The heat dissipation assembly (71) comprises a heat dissipation plate (711) and a plurality of heat dissipation fins (712); one side of the heat dissipation plate (711) is connected to the heat dissipation section (722); the other side of the heat dissipation plate (711) is connected to the plurality of heat dissipation fins (712); the plurality of heat dissipation fins (712) extend along the axial direction of the main shaft (2); and the plurality of heat dissipation fins (712) are sequentially spaced apart in a direction perpendicular to the axial direction of the main shaft (2).

Images