Gearbox, transmission system, wind turbine and heat dissipation system thereof

Abstract

The present disclosure provides a gearbox, a transmission system, a wind turbine generator and a heat dissipation system thereof, the gearbox comprising a housing, an input shaft and a hollow pipe, the input shaft being a hollow shaft and rotatably arranged at a first side of the housing, the hollow pipe having a first end arranged in the input shaft and a second end extending along an axis of the input shaft to a second side of the housing opposite to the first side, both ends of the hollow pipe penetrating the first side and the second side respectively and forming a ventilation channel through the housing, so that the airflow on both sides of the housing can be communicated through the hollow pipe, thereby making it possible for the airflow in the hub and the nacelle cover to be communicated, and the airflow generator for driving the airflow flow is arranged in the nacelle cover, without the need to arrange the airflow generator in the hub, thereby reducing the risk of the airflow generator falling in the hub and improving the heat dissipation reliability of the hub.

Description

Technical Field

[0001] This disclosure pertains to the field of wind power generation technology, and particularly relates to a gearbox, transmission system, wind turbine generator set and its heat dissipation system. Background Technology

[0002] As the concept of green energy gains popularity, wind turbine generators have attracted widespread attention. The hub, a key component connecting the blades and the main shaft, is one of the most important parts of a wind turbine generator.

[0003] Wind turbine generators include a pitch system used to drive the blades to rotate relative to the hub to maximize wind energy utilization. To achieve reliable blade pitch control, the pitch system typically includes a pitch motor, pitch bearings, and a pitch control module. These components are usually located inside the hub. During wind turbine operation, these components generate heat, and cooling measures are typically required to ensure long-term stable operation of the wind turbine generator.

[0004] Currently, wheel hubs typically use air cooling, with vents on the hub and a cooling fan inside to drive airflow into the hub and remove heat. However, since the hub needs to rotate during the operation of the wind turbine, the cooling fan will rotate with the hub, which poses a risk of the cooling fan falling off.

[0005] Improving the heat dissipation reliability of wheel hubs is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The main objective of this disclosure is to provide a gearbox, transmission system, wind turbine generator set and its heat dissipation system to improve the heat dissipation reliability of the hub.

[0007] To achieve the above objectives, this disclosure provides the following technical solution:

[0008] According to one aspect of this disclosure, a gearbox is provided, the gearbox including a housing, an input shaft, and a hollow tube, the input shaft being a hollow shaft and rotatably disposed on a first side of the housing, a first end of the hollow tube being disposed in the input shaft and a second end extending along the axis of the input shaft toward a second side of the housing opposite to the first side, the two ends of the hollow tube respectively penetrating the first side and the second side and forming a ventilation channel penetrating the housing.

[0009] According to an exemplary embodiment of this disclosure, the gearbox further includes a cable bracket disposed in the hollow tube. The cable bracket has a cable mounting hole for mounting a cable. A ventilation hole is formed on the cable bracket and / or between the outer peripheral edge of the cable bracket and the inner wall of the hollow tube. The ventilation hole allows airflow on both sides of the cable bracket within the hollow tube to communicate.

[0010] According to an exemplary embodiment of the present disclosure, the cable bracket is a cylinder with a plurality of axial through holes, the central axis of the cable bracket is parallel to the extension direction of the hollow tube, a portion of the plurality of axial through holes forms the cable mounting hole, and another portion of the plurality of axial through holes forms the ventilation hole.

[0011] According to an exemplary embodiment of this disclosure, a plurality of cable supports are disposed inside the hollow tube, and the plurality of cable supports are spaced apart along the extension direction of the central axis of the hollow tube.

[0012] According to another aspect of this disclosure, a transmission system is provided, the transmission system including a generator and a gearbox as described above, the output shaft of the gearbox being connected to the rotating shaft of the generator.

[0013] According to an exemplary embodiment of the present disclosure, the output shaft of the gearbox is coaxially arranged with the input shaft. The output shaft is a hollow shaft and is rotatably arranged on the second side of the gearbox body. The second end of the hollow tube is located inside the output shaft. The rotating shaft of the generator is a hollow shaft and is connected to the output shaft, so that the hollow tube can communicate with the internal airflow of the rotating shaft and with the external airflow of the transmission system through the rotating shaft.

[0014] According to an exemplary embodiment of the present disclosure, the output shaft of the gearbox is axially parallel to the input shaft and radially offset, such that the hollow tube is radially offset from the output shaft, and the second end of the hollow tube extends outside the gearbox to be able to communicate with the external space airflow of the transmission system.

[0015] According to another aspect of this disclosure, a wind turbine generator set is provided, the wind turbine generator set including a nacelle, a hub, a main shaft, and a transmission system as described above. A first vent is formed on the nacelle; the hub is rotatably disposed on the front side of the nacelle, and the hub is provided with a second vent; the main shaft is connected to the hub, the main shaft being a hollow shaft and communicating with the internal airflow of the hub; the transmission system is disposed within the nacelle, such that the second end of the hollow tube can communicate with the internal airflow of the nacelle; the input shaft of the gearbox is connected to the main shaft and communicates with the airflow, such that the first end of the hollow tube communicates with the internal airflow of the main shaft, thereby the hollow tube communicating with the internal airflow of the hub through the main shaft.

[0016] According to another aspect of this disclosure, a heat dissipation system for a wind turbine generator set is provided. The heat dissipation system includes a heat dissipation channel and an airflow generator. The hub, the main shaft, the hollow tube, and the nacelle are in airflow communication to form at least a portion of the heat dissipation channel. The airflow generator is installed inside the nacelle and is used to drive external airflow to enter from one of a first vent and a second vent and flow through the heat dissipation channel, and to exit through the other of the first vent and the second vent.

[0017] According to an exemplary embodiment of this disclosure, the airflow generator includes a fan or an industrial air conditioner.

[0018] According to an exemplary embodiment of this disclosure, a through hole is provided on the front side of the hub at a position opposite to the end face of the main shaft, the through hole being formed as the second ventilation opening, and / or, the manhole of the hub being formed as the second ventilation opening.

[0019] According to an exemplary embodiment of the present disclosure, the first vent is disposed at the rear of the nacelle cover, and the first vent and / or the second vent is provided with a valve and a filter.

[0020] According to an exemplary embodiment of this disclosure, the heat dissipation system further includes a temperature sensor and a controller. The temperature sensor is used to monitor the internal temperature of the wheel hub and / or the internal temperature of the engine compartment cover. The controller is used to receive the temperature parameters from the temperature sensor and to adjust the opening of the air valve and / or control the airflow of the airflow generator to adjust the airflow of the heat dissipation channel based on the temperature parameters.

[0021] According to an exemplary embodiment of the present disclosure, the wind turbine generator set further includes a flow guiding structure disposed within the main shaft, wherein the inlet of the flow guiding structure is disposed opposite to the end opening of the hollow tube, and the outlet of the flow guiding structure is disposed toward the hub.

[0022] According to an exemplary embodiment of this disclosure, a coupling is provided between the main shaft and the input shaft of the gearbox, and the coupling is provided with a through hole, so that the hollow tube can communicate with the airflow of the guide structure through the through hole.

[0023] According to an exemplary embodiment of this disclosure, the flow guiding structure includes a venturi tube or a flow guiding grid.

[0024] The gearbox, transmission system, wind turbine generator set and its heat dissipation system provided in this disclosure have at least the following beneficial effects: The gearbox provided in this disclosure is provided with a hollow tube, which is a hollow structure and runs through the opposite sides of the gearbox body, so that the airflow on both sides of the gearbox body can be connected through the hollow tube, thereby making it possible for the airflow between the hub and the nacelle cover to be connected. The airflow generator used to drive the airflow is placed in the nacelle cover, instead of placing the airflow generator in the hub, thereby reducing the risk of the airflow generator falling out of the hub and improving the heat dissipation reliability of the hub. Attached Figure Description

[0025] The above and / or other objects and advantages of this disclosure will become clearer from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 A schematic diagram of the structure of a wind turbine generator set provided for a first exemplary embodiment of this disclosure.

[0027] Figure 2 for Figure 1 A schematic diagram of the intermediate gearbox.

[0028] Figure 3 for Figure 1 A schematic diagram of the cable bracket structure.

[0029] Figure 4 for Figure 1 A schematic diagram of the airflow direction in a wind turbine generator set.

[0030] Figure 5 A schematic diagram of the structure of a wind turbine generator set provided for a second exemplary embodiment of this disclosure.

[0031] Figure 6 for Figure 5 A schematic diagram of the gearbox structure.

[0032] Figure 7 for Figure 5 A schematic diagram of the airflow direction in a wind turbine generator set.

[0033] Figure 8 A schematic diagram of the structure of a wind turbine generator set provided for a third exemplary embodiment of this disclosure.

[0034] Explanation of reference numerals in the attached figures:

[0035] 101. Wheel hub; 102. Spindle;

[0036] 103. Bearings; 104. Gearbox;

[0037] 105. Cable bracket; 106. Slip ring;

[0038] 107. Airflow generator; 108. First ventilation opening;

[0039] 109. Cabin canopy; 110. Hollow tube;

[0040] 111. Blade; 112. Second vent;

[0041] 113. Generator; 114. Windproof cap;

[0042] 115. Venturi tube; 116. Coupling;

[0043] 1041. Housing; 1042. Input shaft;

[0044] 1043. Output shaft; 1044. Input shaft bearing;

[0045] 1045. Output shaft bearing; 1046. Hollow tube bearing;

[0046] 1051. Cable mounting hole; 1052. Ventilation hole. Detailed Implementation

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be construed that the embodiments of this disclosure are limited to those described herein. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0048] In current wind turbine generator sets, a fan is typically installed inside the hub to dissipate heat from the hub. The main shaft connected to the hub is usually designed as a hollow structure, allowing the inner cavity of the main shaft to communicate with the hub. However, the connection between the main shaft and the gearbox is usually a sealed structure, which leads to poor airflow inside the main shaft, affecting heat dissipation and ventilation.

[0049] In addition, in desert, Gobi, and arid regions, dust can easily penetrate the wind turbine generator set, causing damage to its internal components. Current turbines often use a positive pressure nacelle, where air is drawn in through a few filtered ducts on the nacelle cover, creating a higher air pressure inside the nacelle than outside. However, the turbine hub, being a constantly moving component, generally struggles to maintain a reliable slightly positive pressure environment. Even with cooling fans installed in the aforementioned manner, both cost and reliability remain unsatisfactory.

[0050] Reference Figures 1 to 4According to a first exemplary embodiment of this disclosure, a wind turbine generator set is provided, comprising a tower (not shown), a nacelle 109, an rotor, and a generator 113. The nacelle 109 can be connected to the tower, for example, but not limited to, the top of the tower. The nacelle 109 can form a nacelle for accommodating various generator components, thereby protecting the generator components of the wind turbine generator set. The rotor is disposed on the front side of the nacelle and may include a hub 101 rotatable relative to the nacelle and a plurality of blades 111 connected to the hub 101. When the blades 111 are subjected to external wind force, they can drive the hub 101 to rotate relative to the nacelle.

[0051] In this embodiment, the hub 101 is rotatably disposed on the front side of the engine compartment cover 109. The hub 101 can be connected to the rotating shaft of the generator 113 via the main shaft 102, so that the rotation of the hub 101 drives the generator 113 to generate electricity. In this embodiment, the generator 113 can be disposed inside the engine compartment cover 109, but is not limited thereto.

[0052] To meet the high-speed requirements of the generator 113, the wind turbine generator set may also include a gearbox 104. In this case, the hub 101 can be connected to the gearbox 104 via the main shaft 102 so that the rotation of the hub 101 can be transmitted to the gearbox 104. Furthermore, the main shaft 102 is connected to the shaft of the generator 113 via the gearbox 104, thereby transmitting the rotation of the hub 101 to the generator 113 for power generation.

[0053] Specifically, the gearbox 104 may include a housing 1041, an input shaft 1042, and an output shaft 1043. The input shaft 1042 and output shaft 1043 are rotatably connected to the housing 1041. The main shaft 102 can be connected to the input shaft 1042, and the generator 113's rotating shaft can be connected to the output shaft 1043. This allows the rotation of the main shaft 102 to be transmitted to the generator 113's rotating shaft via the gearbox 104 for power generation. In this embodiment, by providing the gearbox 104 between the main shaft 102 and the generator 113, the low-speed, high-torque mechanical energy of the impeller can be converted into high-speed, low-torque mechanical energy and transmitted to the generator, which can then use this mechanical energy to generate electricity. In this embodiment, the gearbox 104 may be located inside the nacelle cover 109, but this is not a limitation.

[0054] More specifically, the two ends of the main shaft 102 are connected to the hub 101 and the input shaft 1042 of the gearbox 104, respectively. That is, one end of the main shaft 102 is connected to the hub 101 and the other end is connected to the input shaft 1042 of the gearbox 104, so that the rotation of the hub 101 can be transmitted to the gearbox 104 and then to the generator 113 for power generation.

[0055] As an example, the wind turbine generator provided in this disclosure may be a semi-direct drive wind turbine generator or a doubly-fed wind turbine generator.

[0056] In order to enable the wind turbine to operate continuously and reliably, the wind turbine may also include a heat dissipation system for carrying away and dissipating the heat generated by various components of the wind turbine during operation to the outside of the wind turbine. For example, but not limited to, the heat dissipation system may be used for heat dissipation of the hub 101 and the nacelle, but is not limited thereto.

[0057] Referring again to the accompanying drawings, this disclosure provides a heat dissipation system suitable for wind turbine generator sets, which can employ air cooling for heat dissipation. Specifically, the heat dissipation system may include heat dissipation channels and an airflow generator 107.

[0058] In this embodiment, the gearbox 104 may include a housing 1041 and a hollow tube 110 disposed within the housing 1041. The hollow tube 110 may be a hollow structure and penetrate through opposite first and second sides of the housing 1041 to form part of a heat dissipation channel. An airflow generator 107 may be used to drive airflow through the heat dissipation channel, but is not limited thereto. As an example, the airflow generator 107 may include a fan or an industrial air conditioner, but is not limited thereto. As an example, the hollow tube 110 may be fixed to the input shaft 1042 so that it can rotate with the input shaft 1042 relative to the housing 1041, but is not limited thereto. The connection relationship of the hollow tube 110 will be described in detail below.

[0059] According to another aspect of this disclosure, a gearbox 104 is provided. The gearbox 104 may include a housing 1041, an input shaft 1042, and a hollow tube 110. The input shaft 1042 may be a hollow shaft and rotatably disposed on a first side of the housing 1041. The hollow tube 110 may be disposed in the input shaft 1042 and extend along the axis of the input shaft 1042 toward a second side of the housing 1041 opposite to the first side, such that both ends of the hollow tube 110 pass through the first side and the second side of the housing 1041 respectively and form a ventilation channel through the housing 1041. The ventilation channel may be formed as part of a heat dissipation channel, allowing airflow outside the first side of the housing 1041 to reach outside the second side of the housing 1041 via the hollow tube 110, or allowing airflow outside the second side of the housing 1041 to reach outside the first side of the housing 1041 via the hollow tube 110, thus providing the possibility of airflow communication between the hub 101 and the nacelle cover 109.

[0060] In one exemplary embodiment of this disclosure, the hub 101 can be connected to the input shaft 1042 of the gearbox 104 via the main shaft 102. That is, one end of the main shaft 102 can be connected to the hub 101, and the other end can be connected to the input shaft 1042 of the gearbox 104, so as to transmit the rotation of the impeller to the gearbox 104 via the main shaft 102, and then to the generator 113 for power generation.

[0061] As an example, the spindle 102 can be rotatably connected to the nacelle cover 109 via a bearing 103, for example, but not limited to, the other end of the spindle 102 being disposed within the nacelle cover 109. Figure 1 As shown, but not limited thereto. In this embodiment, the main shaft 102 can be a hollow structure. One end of the main shaft 102 can be connected to the hub 101 and the inner cavity of the main shaft 102 is in airflow communication with the inner cavity of the hub 101. The other end of the main shaft 102 can be connected to the input shaft 1042 of the gearbox 104.

[0062] As an example, the output shaft 1043 of the gearbox 104 can be disposed on the second side of the housing 1041, and the rotating shaft of the generator 113 can be connected to the output shaft 1043 to transmit the rotation of the impeller to the rotating shaft of the generator 113, thereby generating electricity, but this is not a limitation. In this embodiment, the output shaft 1043 of the gearbox 104 is rotatably disposed on the second side of the housing 1041, and the first side and the second side are opposite sides of the housing 1041, but this is not a limitation.

[0063] Under the influence of external wind, the impeller will rotate relative to the nacelle cover 109. During this process, the impeller will drive the main shaft 102 to rotate, and then transmit the rotation to the shaft of the generator 113 through the gearbox 104, so as to realize the generator 113 generating electricity.

[0064] To illustrate this embodiment more clearly, the detailed structure of the gearbox 104 will be described below.

[0065] Gearbox 104 can be classified into coaxial gearboxes and non-coaxial gearboxes according to the arrangement of its input shaft 1042 and output shaft 1043. In a coaxial gearbox, the input shaft 1042 and output shaft 1043 are coaxially arranged, hence it can also be called a tandem gearbox. The structure of a coaxial gearbox is known and will not be described further. In a non-coaxial gearbox, the input shaft and output shaft 1043 are axially parallel but radially offset, meaning they are not coaxial. For example, non-coaxial gearboxes can be further classified into open-type gearboxes, split-flow gearboxes, and hybrid gearboxes. The structure of a non-coaxial gearbox is known and will not be described further.

[0066] Continue to refer to Figure 1 and Figure 2In one exemplary embodiment of this disclosure, the input shaft 1042 and the output shaft 1043 of the gearbox 104 are on the same axis of rotation, so that the gearbox 104 can be a coaxial gearbox.

[0067] Furthermore, the input shaft 1042 of the gearbox 104 can be a hollow structure, and the input shaft 1042 of the gearbox 104 can be connected to the main shaft 102, and the inner cavity of the input shaft 1042 of the gearbox 104 is connected to the inner cavity of the main shaft 102, thereby allowing the hollow tube 110 to be connected to the main shaft 102 for airflow.

[0068] As an example, the other end of the main shaft 102 can be fixedly connected to the input shaft 1042 via a flange. A through hole is provided on the flange, and the end of the hollow tube 110 can be disposed in the through hole so that the inner cavity of the hollow tube 110 and the inner cavity of the main shaft 102 can be connected by airflow, but this is not a limitation.

[0069] The hollow tube 110 can pass through both sides of the gearbox 104, thereby connecting the hub 101, the main shaft 102, and the hollow tube 110 to form at least part of a heat dissipation channel. The airflow generator 107 is used to drive airflow through the heat dissipation channel. With this configuration, the main shaft 102 forms part of the heat dissipation channel, which helps to improve the ventilation and heat dissipation effect.

[0070] As an example, the hollow tube 110 extends beyond the gearbox 104 along the extension direction of the main shaft 102, but is not limited thereto. This disclosure uses an airflow generator 107 to blow airflow into the hub 101, creating a positive pressure environment within the hub 101. This effectively prevents impurities such as salt spray or dust from entering the wind turbine generator, particularly in harsh offshore or onshore dust environments, thereby improving the operational reliability of the wind turbine generator.

[0071] Continue to refer to Figure 2 As an example, the hollow tube 110 may be fixedly connected to the input shaft 1042 of the gearbox 104, but is not limited thereto.

[0072] In this embodiment, the input shaft 1042 is rotatably connected to the first side of the housing 1041 via an input shaft bearing 1044. The first end of the hollow tube 110 can be fastened to the input shaft 1042, allowing the hollow tube 110 to rotate relative to the housing 1041 along with the input shaft 1042; that is, the rotational speed of the hollow tube 110 is the same as the rotational speed of the input shaft 1042. The second end of the hollow tube 110 is rotatably connected to the second side of the housing 1041 via a hollow tube bearing 1046, and the output shaft 1043 is rotatably connected to the second side of the housing 1041 via an output shaft bearing 1045. In this embodiment, the rotational speed of the hollow tube 110 and the rotational speed of the output shaft 1043 can be different, but are not limited thereto.

[0073] return Figure 1 In this embodiment, the shaft of the generator 113 can be configured as a hollow shaft. Specifically, the output shaft 1043 of the gearbox 104 is connected to the shaft of the generator 113, and the output shaft 1043 of the gearbox 104 can be a hollow structure, so that the hollow tube 110 can extend through the output shaft 1043 into the shaft of the generator 113, and pass through the shaft of the generator 113 to communicate with the internal airflow of the nacelle cover 109, so that the hollow tube 110 communicates with the internal airflow of the nacelle cover 109 through the shaft of the generator 113.

[0074] As an example, the shaft of generator 113 and the output shaft 1043 of gearbox 104 can be directly connected without the need for a coupling between the shaft of generator 113 and the output shaft 1043 of gearbox 104.

[0075] In this embodiment, the airflow generator 107 is disposed inside the nacelle cover 109. For example, but not limited to, the airflow generator 107 can be fixed to the housing of the generator 113, and the air outlet of the airflow generator 107 can be arranged facing the end of the rotating shaft of the generator 113. As an example, the air outlet of the airflow generator 107 can be arranged facing the end of the hollow tube 110, so that the air outlet of the airflow generator 107 can blow airflow into the hollow tube 110. The airflow passes through the hollow tube 110, the main shaft 102 and the hub 101 in sequence and then leaves the heat dissipation system from the second vent 112.

[0076] In this embodiment, the shaft of generator 113 is connected to the output shaft 1043 of gearbox 104 and has approximately the same rotational speed. The hollow tube 110 and the input shaft 1042 of gearbox 104 have approximately the same rotational speed. Therefore, the hollow tube 110 and the shaft of generator 113 can have different rotational speeds. In order to protect the cable (described below), the hollow tube 110 extends into the shaft of generator 113, but is not limited thereto.

[0077] This disclosure provides a hollow tube 110 within the gearbox 104, the hollow tube 110 being a hollow structure that penetrates the housing 1041 of the gearbox 104. This allows airflow communication between the generator 113's shaft and the engine compartment shroud 109, enabling the main shaft 102 to communicate with the engine compartment shroud 109 via the hollow tube 110. This, in turn, connects the airflow inside the hub 101 and the engine compartment shroud 109, making it possible for the airflow generator 107, located inside the engine compartment shroud 109, to dissipate heat from the hub 101. This avoids the risk of the airflow generator 107 falling out of the hub 101. Furthermore, in this embodiment, the interconnected airflow between the hub 101 and the engine compartment shroud 109 allows for shared heat dissipation.

[0078] In this embodiment, since the inner cavities of the wheel hub 101 and the engine hood 109 are connected, they can share the airflow generator 107, thereby reducing the number of components in the heat dissipation system. Furthermore, compared to the technical solution where the airflow generator 107 is located inside the wheel hub 101, this embodiment can place the airflow generator 107 inside the engine hood 109, reducing the risk of the airflow generator 107 falling off, thereby improving the reliability of the heat dissipation system.

[0079] In this embodiment, the main shaft 102, the input shaft 1042 and output shaft 1043 of the gearbox 104, and the rotating shaft of the generator 113 can be coaxially arranged. The hollow tube 110 can pass through the gearbox 104 and extend into the rotating shaft of the generator 113, but is not limited thereto. The hollow tube 110 arranged in the gearbox 104 can connect the internal airflow of the main shaft 102 and the engine compartment cover 109, and also connect the airflow of the main shaft 102 and the hub 101. This allows the hub 101, main shaft 102, hollow tube 110, and engine compartment cover 109 to form at least part of a heat dissipation channel. Driven by the airflow generator 107, the airflow can circulate in the heat dissipation channel, thereby carrying away the heat in the engine compartment cover 109 and the hub 101.

[0080] return Figure 1 The airflow generator 107 can be disposed on the side of the generator 113 housing opposite to the gearbox 104. As an example, the airflow generator 107 can be connected to the generator 113 housing, and the air outlet of the airflow generator 107 can communicate with the end face of the hollow tube 110 disposed within the generator 113 shaft to blow airflow into the hollow tube 110 for heat dissipation of the hub 101 or the engine hood 109, but this is not a limitation. If necessary, the airflow generator 107 can also be connected to the engine hood 109 via a bracket, and the air outlet of the airflow generator 107 can be disposed opposite to the end of the hollow tube 110 to blow airflow into the hollow tube 110, but this is not a limitation.

[0081] Reference Figure 1 and Figure 4 In this embodiment, the gearbox 104 is usually equipped with cables, such as, but not limited to, the cables may include power lines, control lines, optical fibers, network cables, sensor lines, etc. of the pitch control cabinet in the hub. The above cables can be set in the hollow tube 110. In order to avoid the above cables from getting tangled or twisted during the operation of the wind turbine, which would affect the reliability of use, the cables can be fixed in the hollow tube 110 by the cable bracket 105, but this is not a limitation.

[0082] Specifically, the gearbox 104 also includes a cable holder 105 disposed within the hollow tube 110, allowing cables to be connected to the hollow tube 110 via the cable holder 105. As an example, the cable holder 105 has cable mounting holes 1051 formed thereon for mounting cables, but this is not a limitation.

[0083] To improve the ventilation of the heat dissipation channel, ventilation holes 1052 are formed on the cable bracket 105, and the ventilation holes 1052 allow the airflow inside the hollow tube 110 located on both sides of the cable bracket 105 to communicate.

[0084] Reference Figure 4 The cable bracket 105 is a cylinder with multiple axial through holes. The central axis of the cable bracket 105 is parallel to the extension direction of the hollow tube 110. A portion of the multiple axial through holes forms a cable mounting hole 1051, and another portion of the axial through holes forms a ventilation hole 1052. As an example, the cable mounting hole 1051 is located in the middle of the cable bracket 105, and there are multiple ventilation holes 1052. The multiple ventilation holes 1052 are arranged circumferentially around the outside of the cable mounting hole 1051, but this is not a limitation.

[0085] The above embodiment uses a cylindrical cable bracket 105 as an example. The diameter of the cable bracket 105 can be the same as the diameter of the hollow tube 110, so that the outer peripheral edge of the cable bracket 105 fits and is fixed to the inner wall of the hollow tube 110. The ventilation hole 1052 is an axial through hole provided on the cable bracket 105. However, it is not limited to this. As long as the airflow on both sides of the cable bracket 105 can be connected, it is within the protection scope of this disclosure.

[0086] In addition, the cable bracket 105 can be configured to have a diameter smaller than that of the hollow tube 110. The cable bracket 105 can be fixed to the hollow tube 110 by means of an external connecting plate. Ventilation holes 1052 can be formed between the circumferential edge of the cable bracket 105 and the inner wall of the hollow tube 110 to improve the ventilation efficiency of the cable bracket 105.

[0087] As an example, the cable bracket 105 can also be configured as a pentagonal star. The five corners of the pentagonal star-shaped cable bracket 105 can be fitted and fixed to the inner wall of the hollow tube 110. In addition to providing axial through holes on the cable bracket 105 to form ventilation holes 1052, the ventilation holes 1052 are formed by adjacent two corners and the inner wall of the hollow tube 110 to increase the ventilation area of ​​the cable bracket 105, but this is not a limitation. In an optional embodiment, the cable bracket 105 can also be configured as an ellipse. In addition to providing axial through holes on the cable bracket 105 to form ventilation holes 1052, a gap can be provided between the circumferential outer edge of the cable bracket 105 and the inner wall of the hollow tube 110. This gap can form ventilation holes 1052, allowing airflow to communicate on both sides of the cable bracket 105, but this is not a limitation.

[0088] Continue to refer to Figure 1 Furthermore, multiple cable supports 105 can be provided inside the hollow tube 110. The multiple cable supports 105 can be arranged at intervals along the extension direction of the central axis of the hollow tube 110, but are not limited thereto.

[0089] To further improve the structural strength of the cable bracket 105, the cable bracket 105 may be made of metal, but is not limited to this.

[0090] As an example, the wind turbine generator set provided in this embodiment may also include a slip ring 106. The slip ring 106 may be arranged outside the generator 113. For example, but not limited to, the slip ring 106 may be fixed to the housing of the generator 113, or fixed to the nacelle cover 109 by a bracket, but not limited thereto.

[0091] Furthermore, the slip ring 106 may include a stator structure and a rotor structure rotatable relative to the stator structure. The stator structure may be fixed to the housing of the generator 113 or fixed to the nacelle cover 109 via a bracket. The rotor structure may be connected to the hollow tube 110 so that it can rotate together with the hollow tube 110. With this configuration, the hollow tube 110 and the cables inside it can rotate synchronously with the rotor structure, effectively preventing rotational friction between the cables and components such as the housing of the generator 113, thereby providing effective protection for the cables. As an example, the rotor structure may be connected to the hollow tube 110 through the housing of the airflow generator 107, but this is not a limitation.

[0092] Continue to refer to Figure 1In this embodiment, in order to utilize external cold air to dissipate heat from the engine compartment and wheel hub, a first ventilation opening 108 is provided in the engine compartment cover 109, and an air valve is provided at the first ventilation opening 108 to regulate the airflow entering the engine compartment cover 109 by adjusting the size of the air valve. As an example, the first ventilation opening 108 is located on the side of the engine compartment cover 109 facing away from the wheel hub 101, that is, the first ventilation opening 108 is located at the rear of the engine compartment cover 109, but this is not a limitation.

[0093] Accordingly, a second vent 112 is provided on the hub 101, and an air valve is provided at the second vent 112. The function of the air valve is the same as that of the air valve at the first vent 108, and will not be described in detail here.

[0094] As an example, a through hole is provided on the front side of the hub 101 at a position opposite to the end face of the main shaft 102, and the through hole is formed as a second ventilation port 112, and / or, the manhole of the hub 101 is formed as a second ventilation port 112.

[0095] In this embodiment, according to the usage requirements of the wind turbine generator set, the first vent 108 can be used as the air inlet of the heat dissipation system, and the second vent 112 can be used as the air outlet of the heat dissipation system. Under the driving action of the airflow generator 107, the airflow can enter the interior of the nacelle cover 109 through the first vent 108, pass through the hollow tube 110, the main shaft 102 and the hub 101 in sequence, and then leave the hub 101 through the second vent 112. The flow direction of the airflow in the nacelle cover 109 and the hub 101 can be referred to Figure 4 The arrow indicates the direction of airflow.

[0096] Specifically, in this embodiment, the generator 113, gearbox 104 and main shaft 102 are all located inside the nacelle cover 109. Therefore, during the operation of the wind turbine generator set, some of the heat generated by the generator 113, gearbox 104 and main shaft 102 will be dissipated into the interior of the nacelle cover 109.

[0097] During the operation of the wind turbine generator set, the cooling system can be activated. Driven by the airflow generator 107, the low-temperature airflow from the outside enters the interior of the nacelle cover 109 through the first vent 108. The high-temperature airflow inside the nacelle cover 109 can enter the hollow tube 110, and then flow through the main shaft 102 and the hub 101 before leaving the wind turbine generator set through the second vent 112. This achieves common heat dissipation of the nacelle cover 109 and the hub 101, thereby improving the heat dissipation efficiency of the wind turbine generator set.

[0098] In this embodiment, low-temperature airflow and high-temperature airflow are relative. As the wind turbine generator operates, the heat generated by the operation of components such as the generator 113 and gearbox 104 will be dissipated into the nacelle cover 109, causing the temperature inside the nacelle cover 109 to rise. Therefore, the airflow temperature inside the nacelle cover 109 is higher than the outside airflow temperature. At this time, the airflow inside the nacelle cover 109 can be defined as high-temperature airflow, and the outside airflow is called low-temperature airflow.

[0099] To further improve the airflow smoothness within the hub ventilation duct, a through hole is provided on the front side of the hub 101. This through hole can be formed as a second ventilation port 112 of the hub 101. The second ventilation port 112 can be positioned facing the end face of the main shaft 102, so that the airflow flowing out through the end face of the main shaft 102 can leave the hub 101 through the second ventilation port 112, thereby preventing the airflow from swirling inside the hub 101 and improving the heat dissipation efficiency of the hub 101.

[0100] In this embodiment, a fairing is fitted on the outside of the hub 101 to protect the hub 101. A fairing ventilation hole is provided on the front side of the fairing, which is arranged opposite to the second ventilation port 112. The airflow can leave the fairing through the fairing ventilation hole, avoiding the airflow after leaving the hub 101 through the second ventilation port 112 from flowing back again, and further improving the heat dissipation efficiency of the heat dissipation system.

[0101] As an example, a windproof cap 114 is connected to the wheel hub 101. The windproof cap 114 can cover the outside of the second vent 112 to prevent external impurities such as rainwater or dust from entering the wheel hub 101, but is not limited to this.

[0102] In an optional embodiment, an exemplary embodiment of this disclosure is provided, in which the hub 101 is also provided with a manhole, which can be used to form a second ventilation opening 112. In this way, ventilation can be carried out using the original structure (manhole) of the hub 101. While meeting the ventilation requirements, there is no need to add too many ventilation openings, thereby ensuring the structural strength of the hub 101 to a certain extent.

[0103] To further prevent impurities in the airflow from entering the wind turbine and affecting its service life, filters are respectively installed at the first vent 108 and the second vent 112 in this embodiment. In this embodiment, the impurities can be external salt spray or dust, but are not limited to these. By installing filters, these impurities in the airflow can be filtered out, purifying the airflow entering the nacelle shroud 109 and improving the service life of the heat dissipation system to some extent. As an example, the filter can be an air filter or a salt spray filter, but is not limited to these. Salt spray filters are more suitable for offshore wind turbines, but are not limited to these applications.

[0104] This embodiment uses the first vent 108 as the air inlet of the heat dissipation system and the second vent 112 as the air outlet of the heat dissipation system as an example for illustration, but it is not limited thereto. Depending on the needs, the first vent 108 can also be used as the air outlet of the heat dissipation system, and correspondingly, the second vent 112 can be used as the air inlet of the heat dissipation system. In this case, the airflow direction within the hood 109 and the wheel hub 101 is as follows: Figure 4 The opposite direction of the middle arrow, but not limited to this.

[0105] In this embodiment, the heat dissipation system includes a heat dissipation channel and an airflow generator 107. The hub 101, main shaft 102, hollow tube 110 and engine hood 109 are connected by airflow to form a heat dissipation channel. The airflow generator 107 is installed inside the engine hood 109 and is used to drive external airflow to enter from one of the first vent 108 and the second vent 112 and flow through the heat dissipation channel, and to flow out through the other of the first vent 108 and the second vent 112, thereby carrying away the heat in the engine hood 109 and the hub 101.

[0106] To further improve the ease of use and automation of the wind turbine generator's cooling system, the cooling system may also include a temperature sensor and a controller. The temperature sensor is used to monitor the internal temperature of the hub 101 and / or the internal temperature of the nacelle cover 109. The controller is used to receive the temperature parameters from the temperature sensor and can adjust the opening of the air valve and / or control the airflow of the airflow generator 107 to adjust the airflow of the cooling channel.

[0107] As an example, the aforementioned temperature sensor is installed inside the wheel hub 101 to monitor the temperature inside the wheel hub 101, or the aforementioned temperature sensor is installed inside the engine compartment cover 109 to monitor the temperature inside the engine compartment cover 109. This temperature sensor can transmit the monitored temperature to a controller, which can control the opening of the air valve based on the real-time monitored temperature to adjust the ventilation volume of the air valve, thereby adjusting the ventilation volume of the heat dissipation channel. Alternatively, the controller can control the airflow of the airflow generator 107 based on the real-time monitored temperature, thereby adjusting the ventilation volume of the heat dissipation channel.

[0108] This embodiment uses the example of temperature sensors being installed in both the wheel hub 101 and the engine hood 109, but it is not limited to this.

[0109] During the operation of the wind turbine generator set, temperature sensors monitor the internal temperature of the hub 101 and / or the internal temperature of the nacelle shroud 109 in real time and transmit the monitored temperatures to the controller. The controller compares the monitored temperature with a preset temperature range. When the monitored temperature exceeds the preset temperature range, the controller can increase the opening of the air valve, thereby increasing the airflow of the air generator 107 and thus increasing the airflow through the heat dissipation channel to accelerate heat dissipation. This temperature control process requires no human intervention, improving the automation level of the heat dissipation system and enhancing its ease of use.

[0110] In this embodiment, the controller can adjust the ventilation volume of the heat dissipation channel by controlling the air volume of the airflow generator 107 or adjusting the opening of the air valve (not shown). As needed, the controller can also simultaneously control the air volume of the airflow generator 107 and the opening of the air valve, all of which are within the protection scope of this disclosure.

[0111] As an example, the controller can be fixed to the inner wall of the nacelle cover 109 or to the tower, but is not limited thereto; the installation location of the controller can be selected as needed.

[0112] In this embodiment, the hub 101 can be cooled by air. A first vent 108 is formed in the engine compartment cover 109, and a second vent 112 is provided on the hub 101. Under the action of the airflow generator 107, airflow can enter the engine compartment cover 109 through the first vent 108, then pass through the hollow tube 110, the main shaft 102, and the hub 101, and then exit the hub 101 through the second vent 112, thereby simultaneously cooling the hub 101 and the engine compartment. In this embodiment, the first vent 108 is used as the air inlet of the cooling system, and the second vent 112 is used as the air outlet of the cooling system.

[0113] In this embodiment, by providing a hollow tube 110 inside the gearbox 104, the hollow tube 110 is connected to the main shaft 102 and the engine compartment cover 109 respectively by airflow. This enables the inner cavity of the engine compartment cover 109 to be connected to the inner cavity of the hub 101 by airflow through the hollow tube 110. Under the action of the airflow generator 107, the airflow can pass smoothly through the heat dissipation channel, thereby simultaneously dissipating heat from the components inside the engine compartment cover 109 and the components inside the hub 101.

[0114] The above embodiments primarily illustrate the use of the airflow generator 107 in cooling mode, where it blows low-temperature airflow into the heat dissipation channel to lower the temperature of the hub 101 and nacelle cover 109, but this is not a limitation. In addition, the airflow generator 107 can also be used in heating mode as needed. When the temperature inside the hub 101 or nacelle cover 109 is below a predetermined temperature range, the airflow generator 107 is activated to blow high-temperature airflow into the heat dissipation channel, keeping the components inside the hub 101 or nacelle cover 109 within the predetermined temperature range, preventing icing, and thus ensuring the reliability of the wind turbine generator operation.

[0115] This disclosure connects the main shaft 102 and the nacelle cover 109 via a hollow tube 110, enabling stable heat dissipation for the hub 101 and the nacelle cover 109, thus avoiding unstable heat dissipation caused by fluctuations in external ambient temperature. In high-temperature environments, the internal temperature of the hub 101 can be reduced by 10℃-15℃, achieving reliable heat dissipation for various components of the wind turbine generator, such as cable cooling, gearbox cooling, main bearing cooling, and impeller cooling. This effectively extends the service life of the components while providing convenient and comfortable operation and maintenance.

[0116] This embodiment uses filters in the first vent 108 and the second vent 112 to prevent external impurities from entering the unit. For example, the air inside the hub of an offshore unit is prevented from coming into contact with corrosive substances such as salt spray and moisture, and the onshore unit is prevented from being damaged by sand and dust. This further improves the operational reliability of the wind turbine.

[0117] The above embodiments are wind turbine generator sets provided according to the first exemplary embodiment of the present disclosure. The gearbox 104 is a coaxial gearbox as an example for description. In addition, the gearbox 104 can also be a non-coaxial gearbox. The following description will be based on the second exemplary embodiment of the present disclosure. The difference in the gearbox 104 will constitute the main difference between the first exemplary embodiment and the second exemplary embodiment.

[0118] Reference Figures 5 to 7 Unlike the first exemplary embodiment, the input shaft 1042 and output shaft 1043 of the gearbox 104 are axially parallel and radially offset, so that the gearbox 104 is formed as a non-coaxial gearbox.

[0119] Reference Figure 6 In this embodiment, the input shaft 1042 of the gearbox 104 is rotatably connected to the first side of the housing 1041 via the input shaft bearing 1044. One end of the hollow tube 110 can be connected to the input shaft 1042 via fasteners, and the other end of the hollow tube 110 extends toward the second side of the housing 1041 and extends through the second side of the housing 1041 to the outside of the housing 1041. The other end of the hollow tube 110 is rotatably connected to the housing 1041 via the hollow tube bearing 1046.

[0120] In an optional embodiment, the output shaft 1043 of the gearbox 104 is axially parallel to and radially offset from the main shaft 102. In this case, the input shaft 1042 of the gearbox 104 and the main shaft 102 are coaxially arranged, forming that the input shaft 1042 and the output shaft 1043 of the gearbox 104 are non-coaxially arranged, thereby making the gearbox 104 a non-coaxial gearbox.

[0121] return Figure 5 The output shaft 1043 of the gearbox 104 is axially parallel to and radially offset from the main shaft 102. The rotating shaft of the generator 113 is connected to the output shaft 1043 of the gearbox 104. The other end of the hollow tube 110 is disposed outside the second side of the gearbox 104 and communicates with the internal airflow of the nacelle cover 109. The airflow generator 107 can drive the airflow into the hollow tube 110, and then drive the airflow into the heat dissipation channel for heat dissipation.

[0122] In this embodiment, since the input shaft 1042 and output shaft 1043 of the gearbox 104 are radially offset, and the hollow tube 110 is disposed inside the input shaft 1042, the shafts of the hollow tube 110 and the generator 113 are offset. At this time, the slip ring 106 is disposed on the second side of the gearbox 104. The stator structure of the slip ring 106 is fixedly connected to the housing 1041 of the gearbox 104, or is fixedly connected directly to the nacelle cover 109. The rotor structure of the slip ring 106 is connected to the hollow tube 110, but is not limited thereto.

[0123] As an example, the airflow generator 107 can be fixed to the housing 1041 of the gearbox 104, and the air outlet of the airflow generator 107 can be arranged opposite to the end of the hollow tube 110 so as to blow airflow into the hollow tube 110, but is not limited thereto.

[0124] Reference Figure 7 In this embodiment, during the operation of the wind turbine generator set, the airflow generator 107 can be activated. Under the action of the airflow generator 107, the external airflow can enter the nacelle cover 109 through the first vent 108, and the airflow inside the hollow tube 110 can enter the hollow tube 110 through the other end, then pass through the main shaft 102 and the hub 101, and then leave the hub 101 through the second vent 112, thereby carrying away the high-temperature airflow inside the nacelle cover 109 and the hub 101. Figure 7 The direction of the arrow in the image can indicate the direction of airflow.

[0125] This embodiment uses the first vent 108 as the air inlet of the heat dissipation system and the second vent 112 as the air outlet of the heat dissipation system as an example for illustration, but it is not limited thereto. Depending on the needs, the first vent 108 can also be used as the air outlet of the heat dissipation system, and correspondingly, the second vent 112 can be used as the air inlet of the heat dissipation system. In this case, the airflow direction within the hood 109 and the wheel hub 101 is as follows: Figure 7 The opposite direction of the middle arrow, but not limited to this.

[0126] Reference Figure 8 Unlike the wind turbine generator set provided in the first exemplary embodiment, the wind turbine generator set provided in the third exemplary embodiment of this disclosure further includes a flow guiding structure for guiding the airflow in the heat dissipation channel to flow in a directional manner, thereby improving the utilization rate of the airflow and thus improving the heat dissipation efficiency of the heat dissipation system. Specifically, the flow guiding structure is disposed within the main shaft 102, with the inlet of the flow guiding structure facing the end opening of the hollow tube 110, and the outlet of the flow guiding structure facing the hub 101, so that the airflow in the hollow tube 110 can flow in a directional manner toward the hub 101.

[0127] As an example, the airflow guiding structure includes a Venturi tube 115, which is disposed within the main shaft 102. The inlet of the Venturi tube 115 is positioned opposite the end opening of the hollow tube 110, and the outlet of the Venturi tube 115 faces the hub 101. This arrangement allows the airflow within the hollow tube 110 to be directionally drawn out by the Venturi tube 115 and transported to the inner cavity of the hub 101. A negative pressure zone is generated at the throat of the Venturi tube 115, causing the airflow flowing out of the hollow tube 110 to be quickly drawn into the Venturi tube 115, preventing airflow leakage and improving airflow utilization. In addition, due to the large internal space of the hub 101, the airflow velocity decreases after entering the hub 101 from the outlet of the Venturi tube 115, allowing the airflow to fully exchange heat with the internal components of the hub 101, thereby carrying away the high-temperature airflow within the hub 101.

[0128] Unlike the first exemplary embodiment, in this embodiment a coupling 116 may be provided between the main shaft 102 and the input shaft 1042 of the gearbox 104. The coupling 116 is provided with a through hole, so that the hollow tube 110 can be connected to the Venturi tube 115 for airflow through the through hole.

[0129] Specifically, the coupling 116 is disposed between the other end of the main shaft 102 and the input shaft 1042 of the gearbox 104, so that the other end of the main shaft 102 is indirectly connected to the input shaft 1042 of the gearbox 104 through the coupling. The coupling 116 is provided with a through hole for the main shaft 102 and the hollow tube 110 to communicate. The hollow tube 110 can pass through the through hole and extend into the main shaft 102, but is not limited thereto.

[0130] In this embodiment, the coupling 116 can compensate for misalignment between the input shaft 1042 of the main shaft 102 and the gearbox 104, thereby protecting the transmission system. Furthermore, during the operation of the wind turbine generator set, the coupling 116 can transmit torque and isolate vibration, thus protecting the main shaft 102 and the gearbox 104, further protecting the transmission system.

[0131] As an example, coupling 116 can be a rigid coupling or a flexible coupling, but is not limited thereto.

[0132] In this embodiment, since a venturi tube 115 is provided inside the main shaft 102, the airflow flowing out of the hollow tube 110 can be directed into the hub 101, thereby effectively preventing the airflow flowing out of the hollow tube 110 from diffusing outward through the coupling 116, thus improving the utilization rate of the airflow, but not limited thereto.

[0133] In this embodiment, the airflow generator 107 is described as being located on the side of the generator 113 facing away from the gearbox 104, but this is not a limitation. As needed, the airflow generator 107 can also be located between the main shaft 102 and the input shaft 1042 of the gearbox 104, but this is not a limitation.

[0134] In this embodiment, the airflow guiding structure includes a venturi tube 115 as an example, which is used to guide the airflow in the heat dissipation channel to flow in a directional direction toward the hub 101. However, it is not limited to this. As needed, the airflow guiding structure can also be a structure such as an airflow guide grille.

[0135] In the description of this disclosure, it should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0136] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0137] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0138] The features, structures, or characteristics described in this disclosure can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the foregoing description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

Claims

1. A gearbox, characterized in that, The gearbox (104) includes a housing (1041), an input shaft (1042), and a hollow tube (110). The input shaft (1042) is a hollow shaft and is rotatably disposed on a first side of the housing (1041). The first end of the hollow tube (110) is disposed in the input shaft (1042), and the second end extends along the axis of the input shaft (1042) toward a second side of the housing (1041) opposite to the first side. The two ends of the hollow tube (110) pass through the first side and the second side respectively and form a ventilation channel through the housing (1041).

2. The gearbox according to claim 1, characterized in that, The gearbox (104) also includes a cable bracket (105), which is disposed in the hollow tube (110). The cable bracket (105) has a cable mounting hole (1051) for mounting cables. A ventilation hole (1052) is formed on the cable bracket (105) and / or between the outer peripheral edge of the cable bracket (105) and the inner wall of the hollow tube (110). The ventilation hole (1052) allows airflow on both sides of the cable bracket (105) inside the hollow tube (110) to communicate.

3. The gearbox according to claim 2, characterized in that, The cable bracket (105) is a cylinder with multiple axial through holes. The central axis of the cable bracket (105) is parallel to the extension direction of the hollow tube (110). A portion of the multiple axial through holes forms the cable mounting hole (1051), and another portion of the multiple axial through holes forms the ventilation hole (1052).

4. The gearbox according to claim 2 or 3, characterized in that, The hollow tube (110) is provided with a plurality of cable supports (105), and the plurality of cable supports (105) are spaced apart along the extension direction of the central axis of the hollow tube (110).

5. A transmission system, characterized in that, The transmission system includes a generator (113) and a gearbox (104) as described in any one of claims 1-4, wherein the output shaft (1043) of the gearbox (104) is connected to the rotating shaft of the generator (113).

6. The transmission system according to claim 5, characterized in that, The output shaft (1043) of the gearbox (104) is coaxially arranged with the input shaft (1042). The output shaft (1043) is a hollow shaft and is rotatably arranged on the second side of the housing (1041). The rotating shaft of the generator (113) is a hollow shaft and is connected to the output shaft (1043). The second end of the hollow tube (110) extends through the output shaft (1043) into the rotating shaft, and the second end of the hollow tube (110) passes through the generator (113), so that the hollow tube (110) is connected to the external space airflow of the transmission system.

7. The transmission system according to claim 5, characterized in that, The output shaft (1043) of the gearbox (104) is axially parallel to the input shaft (1042) and radially offset, such that the hollow tube (110) is radially offset from the output shaft (1043), and the second end of the hollow tube (110) extends outside the housing (1041) so as to be able to communicate with the external space airflow of the transmission system.

8. A wind turbine generator set, characterized in that, The wind turbine generator set includes: A nacelle cover (109) having a first vent (108) formed thereon. A hub (101) is rotatably disposed on the front side of the nacelle cover (109), and the hub (101) is provided with a second vent (112). The main shaft (102) is connected to the hub (101), and the main shaft (102) is a hollow shaft that communicates with the internal airflow of the hub (101); The transmission system as described in any one of claims 5-7 is disposed in the engine compartment cover (109) such that the second end of the hollow tube (110) can communicate with the internal airflow of the engine compartment cover (109), the input shaft (1042) of the gearbox (104) is connected to the main shaft (102) and communicates with the airflow, such that the first end of the hollow tube (110) communicates with the internal airflow of the main shaft (102), thereby the hollow tube (110) communicates with the internal airflow of the hub (101) through the main shaft (102).

9. A cooling system for a wind turbine generator set as described in claim 8, characterized in that, The heat dissipation system includes a heat dissipation channel and an airflow generator (107). The hub (101), the main shaft (102), the hollow tube (110), and the nacelle cover (109) are in airflow communication to form at least a portion of the heat dissipation channel. The airflow generator (107) is installed inside the nacelle cover (109) to drive external airflow to enter and flow through the heat dissipation channel from one of the first vent (108) and the second vent (112), and to exit through the other of the first vent (108) and the second vent (112).

10. The heat dissipation system according to claim 9, characterized in that, The airflow generator (107) includes a fan or an industrial air conditioner.

11. The heat dissipation system according to claim 9, characterized in that, A through hole is provided on the front side of the hub (101) opposite to the end face of the main shaft (102), and the through hole is formed as the second ventilation port (112). A windproof cap (114) is provided on the outside of the second ventilation port (112); and / or, the manhole of the hub (101) is formed as the second ventilation port (112).

12. The heat dissipation system according to claim 9, characterized in that, The first vent (108) is located at the rear of the nacelle cover (109), and the first vent (108) and / or the second vent (112) are provided with a valve and a filter.

13. The heat dissipation system according to claim 12, characterized in that, The heat dissipation system also includes a temperature sensor and a controller. The temperature sensor is used to monitor the internal temperature of the wheel hub (101) and / or the internal temperature of the engine hood (109). The controller is used to receive the temperature parameters of the temperature sensor and can adjust the opening of the air valve according to the temperature parameters, and / or control the air volume of the airflow generator (107) to adjust the air volume of the heat dissipation channel.

14. The heat dissipation system according to any one of claims 9-13, characterized in that, The wind turbine generator set also includes a flow guide structure, which is disposed inside the main shaft (102). The inlet of the flow guide structure is disposed opposite to the end opening of the hollow tube (110), and the outlet of the flow guide structure is disposed towards the hub (101).

15. The heat dissipation system according to claim 14, characterized in that, A coupling (116) is provided between the main shaft (102) and the input shaft (1042) of the gearbox (104). The coupling (116) is provided with a through hole, so that the hollow tube (110) can communicate with the airflow of the guide structure through the through hole.

16. The heat dissipation system according to claim 15, characterized in that, The flow guiding structure includes a venturi tube (115) or a flow guiding grid.

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