Electromagnetic induction heating type gearbox for wind turbine generator

Abstract

The utility model provides an electromagnetic induction heating type gearbox for a wind turbine generator, and relates to the field of wind power generation. The equipment comprises a box body, an oil pump, an oil inlet pipe, an oil outlet pipe and a control box, wherein a Venturi jet pipe, an electromagnetic induction heating assembly, an electromagnetic flow dividing valve, an upper heat insulation plate, a lower heat insulation plate, a printed circuit board heat exchanger, a cooling liquid box and a circulating pump are arranged in the box body. The wind power gear box lubricating oil heating and cooling device can achieve double functions of heating and cooling of wind power gear box lubricating oil, not only improves operation efficiency of a wind power gear box and service life of the lubricating oil, but also reduces maintenance cost and labor intensity. The electromagnetic induction heating assembly efficiently converts electric energy into heat energy through the electromagnetic induction principle, and lubricating oil fed into a heating pipe by an oil pump is directly and evenly heated in a three-section heating mode of preheating, heating and heat preservation. The printed circuit board heat exchanger is adopted to prevent the temperature of the lubricating oil from being too high and ensure that the lubricating oil works at proper temperature in different operation stages of the whole equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of wind power generation, especially relates to a electromagnetic induction heating type gear box for wind turbine generator system. BACKGROUND

[0002] The installation position of the wind power gear box in the wind turbine generator system is usually located in the middle of the cabin. Specifically, the front end of the gear box is connected with the wind wheel through a flange, is responsible for receiving the mechanical energy transmitted by the wind wheel, and converts it into a suitable rotating speed for the generator to work; and the rear end is connected with the generator through a shaft coupling, transmits the converted rotating speed to the generator, and then generates electric energy. Since the working environment of the wind power gear box is relatively harsh, it is often subjected to irregular variable load wind and strong gusts of wind, and also needs to withstand the influence of scorching heat and extreme temperature difference. In a low temperature environment, the lubricating oil in the wind power gear box is prone to solidification or reduced flowability, affecting the normal operation and service life of the gear box, especially the low temperature type unit operating in a low temperature cold region, the lubricating oil of the gear box must be heated to realize the normal start of the system. The purpose of the wind power gear box heater is to provide lubricating oil with appropriate viscosity through heating, thereby improving the flowability of the lubricating oil.

[0003] At present, a sheathed tubular electric heater is usually installed in the wind power gear box, and the sheathed tubular electric heater adopts an electric heating wire heating mode. Since the lubricating oil in the gear box is relatively viscous in a low temperature environment, the flowability is poor, and the edge part and the bottom part of the lubricating oil in the gear box need a long time to be heated when the sheathed tubular electric heater is heated, causing uneven overall heating of the lubricating oil, and the temperature of part of the lubricating oil is too high. When the lubricating oil is heated to a relatively high temperature, the oxidation speed will obviously accelerate, causing the lubricating oil to deteriorate intensively, the additives in the lubricating oil will be gradually consumed, the lubricating, cooling and flowability of the lubricating oil will be reduced, and the amount of sludge and other precipitates will increase, thereby affecting the normal operation of the wind power gear box.

[0004] In addition, after the wind power gear box operates for a period of time, the oil temperature in the gear box will rise, and the cooling system needs to be started to reduce the oil temperature. The cooling system of the wind power gear box is usually installed at the top of the wind power gear box, and is independently installed with the sheathed tubular electric heater. Although the electric heater and the cooling system of the wind power gear box are independently installed, they have the advantages of flexible configuration and adjustment according to actual needs, no mutual influence during maintenance and replacement of parts, and more convenience, but the installation of the two independent systems needs additional installation space, and needs to be controlled respectively during work, the coordination is poor, and the complexity and operation difficulty of the control system are increased. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a electromagnetic induction heating type gear box for wind turbine generator system to solve the problems existing in the prior art pointed out in the above background.

[0006] To achieve the above object, the utility model adopts technical scheme, which is an electromagnetic induction heating type gear box for wind turbine generator unit, including the box, the top of box installs the oil inlet pipe, the oil outlet pipe, is equipped with the upper heat insulation plate, the venturi jet pipe, the electromagnetic induction heating component, the electromagnetic shunt valve in the box, the electromagnetic induction heating component is fixed on the upper surface of upper heat insulation plate, the inlet of electromagnetic induction heating component is connected with the outlet of venturi jet pipe, the outlet of electromagnetic induction heating component is connected with the inlet of electromagnetic shunt valve, one of the outlets of electromagnetic shunt valve is connected with the inlet section lateral suction inlet of venturi jet pipe through the backflow pipe, the other outlet of electromagnetic shunt valve is connected with the oil outlet pipe arranged on the top of box.

[0007] Further, the electromagnetic induction heating component includes a heating pipe, the heating pipe includes a vertical preheating section, a horizontal heating section, and a vertical heat preservation section, the horizontal heating section is in a serpentine structure, and a magnetic induction heating body is arranged outside the straight pipe portion on the vertical preheating section, the horizontal heating section, and the vertical heat preservation section; the magnetic induction heating body includes an induction heating coil, a heat insulation filling layer, and a metal shielding layer, the induction heating coil is uniformly wound outside the heating pipe, and the heat insulation filling layer is arranged between the heating pipe and the metal shielding layer.

[0008] Further, an oil pump and a first temperature sensor are arranged on the oil inlet pipe, a second temperature sensor is arranged on the oil outlet pipe, a control box is arranged on one side of the box, the control box includes a PLC controller and a plurality of electromagnetic switches, each induction heating coil is electrically connected to the PLC controller through a corresponding electromagnetic switch, and the oil pump, the first temperature sensor, and the second temperature sensor are all electrically connected to the PLC controller.

[0009] Further, the box is provided with a lower heat insulation plate, the lower heat insulation plate is located below the upper heat insulation plate, a printed circuit board heat exchanger is arranged on the lower heat insulation plate, the printed circuit board heat exchanger includes a cold-side upper printed circuit board heat exchange sheet, a hot-side printed circuit board heat exchange sheet, and a cold-side lower printed circuit board heat exchange sheet which are stacked and welded from top to bottom, a cooling liquid tank for containing cooling liquid is arranged in the inner cavity of the box below the lower heat insulation plate, an electromagnetic three-way valve is arranged on the oil inlet pipe, one outlet of the electromagnetic three-way valve is connected with the inlet of the venturi jet pipe, the other outlet of the electromagnetic three-way valve is connected with a hot-side inlet formed in the hot-side printed circuit board heat exchange sheet through an input pipe, a hot-side outlet formed in the hot-side printed circuit board heat exchange sheet is connected with the oil outlet pipe through an output pipe, and the connection point between the output pipe and the oil outlet pipe is located between the second temperature sensor and the electromagnetic shunt valve; a circulating pump is arranged in the cooling liquid tank, the circulating pump is connected with a cold-side upper inlet formed in the cold-side upper printed circuit board heat exchange sheet and a cold-side lower inlet formed in the cold-side lower printed circuit board heat exchange sheet through a cooling liquid input pipe, and a cold-side upper outlet formed in the cold-side upper printed circuit board heat exchange sheet and a cold-side lower outlet formed in the cold-side lower printed circuit board heat exchange sheet are both connected with the cooling liquid tank through a cooling liquid output pipe, and the electromagnetic three-way valve and the circulating pump are both electrically connected to the PLC controller.

[0010] Further, the heat side printed circuit board heat exchange sheet is internally and uniformly provided with a plurality of Tesla valve flow channels, the Tesla valve flow channels are communicated with the heat side inlet through heat side secondary branch flow channels, and the Tesla valve flow channels are communicated with the heat side outlet through heat side secondary collecting flow channels.

[0011] Further, the cold side upper printed circuit board heat exchange sheet is uniformly provided with a plurality of cold side upper sawtooth flow channels on the lower surface, the cold side upper sawtooth flow channels are communicated with the cold side upper inlet through cold side upper secondary branch flow channels, and the cold side upper sawtooth flow channels are communicated with the cold side upper outlet through cold side upper secondary collecting flow channels.

[0012] Further, the cold side lower printed circuit board heat exchange sheet is uniformly provided with a plurality of cold side lower sawtooth flow channels on the upper surface, the cold side lower sawtooth flow channels are communicated with the cold side lower inlet through cold side lower secondary branch flow channels, and the cold side lower sawtooth flow channels are communicated with the cold side lower outlet through cold side lower secondary collecting flow channels.

[0013] Further, the cooling liquid output pipe comprises an upper horizontal pipe section, a vertical pipe section and a lower horizontal pipe section, the upper horizontal pipe section penetrates the side wall of the box body, the vertical pipe section is located outside the box body, and the lower horizontal pipe section penetrates into the cold source chamber.

[0014] Preferably, a plurality of horizontal circular heat dissipation fins are uniformly arranged on the vertical pipe section of the cooling liquid output pipe.

[0015] More preferably, a plurality of ventilation holes are arranged in a circular array on the circular heat dissipation fins.

[0016] Due to the adoption of the above technical scheme, the utility model has the beneficial technical effects that:

[0017] 1. The utility model discloses an integrated electromagnetic induction heater for a wind power gear box, which integrates the heating equipment and the cooling system, realizes the heating and cooling double functions of the wind power gear box lubricating oil, improves the operation efficiency of the wind power gear box and the service life of the lubricating oil, reduces the maintenance cost and labor intensity, reduces the operation complexity of the coordination between the heating equipment and the cooling system, simplifies the whole maintenance process, and realizes the stable and efficient operation of the wind power equipment in the harsh environment.

[0018] 2. The center component of the electromagnetic induction heating type gear box for the wind turbine generator set - the electromagnetic induction heating assembly uses the electromagnetic induction principle, uses the induction heating coil to generate eddy current heating around the heating pipe, efficiently converts electric energy into heat energy, preheats, heats and keeps warm in three-stage heating mode, directly heats the lubricating oil pumped into the heating pipe, avoids long heating time of the lubricating oil at the edge and bottom of the wind power gear box oil pool, ensures uniform oil temperature heating, reduces lubricating oil oxidation, prolongs the service life of the lubricating oil, effectively solves the engineering problems of uneven heating of the traditional heater and lubricating oil deterioration caused by high lubricating oil temperature; The Venturi jet pipe and the electromagnetic shunt valve are combined, not only realize the smooth circulation of the return pipeline, effectively adjust the oil flow temperature, but also work with the control box to realize effective control of the heating process, ensure that the entire lubricating oil system can operate in the appropriate temperature range, prolong the lubricating operation cycle, avoid oil quality deterioration and additive loss caused by high temperature overheating, and improve the working efficiency and reliability of the wind power gear box.

[0019] 3. The electromagnetic induction heating type gear box for the wind turbine generator set adopts printed circuit board heat exchanger, first temperature sensor, second temperature sensor, electromagnetic three-way valve, circulating pump, PLC controller and other components, which can not only avoid high temperature of the lubricating oil and ensure that the lubricating oil works at appropriate temperature, but also can quickly respond to dynamic changes of the temperature, and improve the working life and reliability of the wind power gear box. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the electromagnetic induction heating type gear box for the wind turbine generator set of the utility model;

[0021] Figure 2 It is Figure 1 the structural schematic view of the electromagnetic induction heating assembly in

[0022] Figure 3 It is Figure 2 the cross-sectional view of the magnetic induction heating body in

[0023] Figure 4 It is Figure 1 the internal structure schematic view of the heat side printed circuit board heat exchange sheet in

[0024] Figure 5 It is Figure 1 the bottom view of the cold side upper printed circuit board heat exchange sheet in

[0025] Figure 6 It is Figure 1 the top view of the cold side lower printed circuit board heat exchange sheet in

[0026] Figure 7 It is Figure 1Structure diagram of middle circular heat dissipation fin;

[0027] Figure 8 The control principle block diagram of the utility model;

[0028] Fig. 1-Box, 101-Upper heat insulation plate, 102-Lower heat insulation plate, 2-Oil pump, 3-Oil inlet pipe, 4-Venturi jet pipe, 5-Heating pipe, 6-Magnetic induction heating body, 601-Induction heating coil, 602-Thermal insulation filling layer, 603-Metal shielding layer, 7-Electromagnetic shunt valve, 8-Oil outlet pipe, 9-Return pipe, 10-First temperature sensor, 11-Second temperature sensor, 12-Electromagnetic three-way valve, 13-Input pipe, 14-Hot side printed circuit board heat exchange sheet, 1401-Hot side inlet, 1402-Hot side secondary shunt flow channel, 1403-Tesla valve flow channel, 1404-Hot side secondary flow collecting channel, 1405-Hot side outlet, 15-Output pipe, 16-Cold side upper printed circuit board heat exchange sheet, 1601-Cold side upper outlet, 1602-Cold side upper secondary flow collecting channel, 1603-Cold side upper sawtooth flow channel, 1604-Cold side upper secondary shunt flow channel, 1605-Cold side upper inlet, 17-Cold side lower printed circuit board heat exchange sheet, 1701-Cold side lower outlet, 1702-Cold side lower secondary flow collecting channel, 1703-Cold side lower sawtooth flow channel, 1704-Cold side lower secondary shunt flow channel, 1705-Cold side lower inlet, 18-Cooling liquid tank, 19-Circulating pump, 20-Cooling liquid input pipe, 21-Cooling liquid output pipe, 22-Circular heat dissipation fin, 2201-Vent hole, 23-Control box, 2301-PLC controller, 2302-Electromagnetic switch. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following preferred embodiments are used to further explain the utility model in detail.

[0030] Please refer to the accompanying Figures 1-8 As shown in the figure, the electromagnetic induction heating type gear box for wind turbine generator set of the embodiment comprises a box body, an oil inlet pipe and an oil outlet pipe are installed on the top of the box body, an upper heat insulation plate, a Venturi jet pipe, an electromagnetic induction heating assembly and an electromagnetic shunt valve are arranged in the box body, the electromagnetic induction heating assembly is fixed on the upper surface of the upper heat insulation plate, the inlet of the electromagnetic induction heating assembly is connected with the outlet of the Venturi jet pipe, the outlet of the electromagnetic induction heating assembly is connected with the inlet of the electromagnetic shunt valve, one of the outlets of the electromagnetic shunt valve is connected with the side wall suction inlet of the inlet section of the Venturi jet pipe through a return pipe, and the other outlet of the electromagnetic shunt valve is connected with the oil outlet pipe arranged on the top of the box body.

[0031] In the embodiment, the oil inlet pipe and the oil outlet pipe are communicated with the oil pool in the wind power gear box, and the alternating current generated by the wind power generator can be used as the power supply of the electromagnetic induction heating assembly. The electromagnetic induction heating assembly converts the electric energy into heat energy by using the electromagnetic induction principle to heat the lubricating oil. The low-temperature lubricating oil before heating and the lubricating oil after heating are premixed by the Venturi jet pipe to improve the fluidity of the low-temperature lubricating oil before heating by the electromagnetic induction heating assembly.

[0032] Specifically, the electromagnetic induction heating assembly comprises a heating pipe, the heating pipe comprises a vertical preheating section, a horizontal heating section and a vertical heat preservation section, the horizontal heating section is in a serpentine structure, and a magnetic induction heating body is arranged outside the straight pipe portion of the vertical preheating section, the horizontal heating section and the vertical heat preservation section. The magnetic induction heating body comprises an induction heating coil, a heat insulation filling layer and a metal shielding layer, the induction heating coil is uniformly wound outside the heating pipe, and the heat insulation filling layer is arranged between the heating pipe and the metal shielding layer. An oil pump and a first temperature sensor are arranged on the oil inlet pipe, a second temperature sensor is arranged on the oil outlet pipe, a control box is arranged on one side of the box body, the control box comprises a PLC controller and a plurality of electromagnetic switches, each induction heating coil is electrically connected to the PLC controller through a corresponding electromagnetic switch, and the oil pump, the first temperature sensor and the second temperature sensor are electrically connected to the PLC controller.

[0033] In the embodiment, the heating pipe is made of steel material with good thermal conductivity, mechanical strength and corrosion resistance; the induction heating coil is made of copper wire with excellent electrical conductivity, the induction heating coil generates an alternating magnetic field, and the alternating magnetic field generates eddy current in the heating pipe to realize heating; the heat insulation filling layer is made of magnesium oxide with low thermal conductivity and high stability, the metal shielding layer is made of aluminum or steel material, the PLC controller is of a type of Siemens S7-300 series, and the electromagnetic switch is a relay. The electromagnetic induction heating assembly adopts a three-stage heating treatment mode of preheating, heating and heat preservation to uniformly heat the lubricating oil, controls each induction heating coil respectively, improves the accuracy and flexibility of the lubricating oil heating temperature control, and ensures that the lubricating oil works at a suitable temperature. The first temperature sensor and the second temperature sensor collect the temperatures of the lubricating oil before and after heating respectively. The first temperature sensor and the second temperature sensor are both PT100 temperature sensors. The PLC controller controls the working states of the electromagnetic switch, the electromagnetic shunt valve and the oil pump by using the temperature data collected by the first temperature sensor and the second temperature sensor, so that the electromagnetic induction heating assembly heats the lubricating oil to a suitable working temperature.

[0034] Specifically, the box is provided with a lower heat insulation plate, which is located below the upper heat insulation plate, and a printed circuit board heat exchanger is arranged on the lower heat insulation plate, the printed circuit board heat exchanger comprises a cold side upper printed circuit board heat exchange sheet, a hot side printed circuit board heat exchange sheet and a cold side lower printed circuit board heat exchange sheet which are stacked and welded from top to bottom, a cooling liquid tank for containing cooling liquid is arranged in the inner cavity of the box below the lower heat insulation plate, an electromagnetic three-way valve is arranged on the oil inlet pipe, one outlet of the electromagnetic three-way valve is connected with the inlet of the Venturi jet pipe, and the other outlet of the electromagnetic three-way valve is connected with the hot side inlet arranged on the hot side printed circuit board heat exchange sheet through an input pipe, the hot side outlet arranged on the hot side printed circuit board heat exchange sheet is connected with the oil outlet pipe through an output pipe, and the connecting point between the output pipe and the oil outlet pipe is located between the second temperature sensor and the electromagnetic shunt valve; a circulating pump is arranged in the cooling liquid tank, and the circulating pump is connected with the cold side upper inlet arranged on the cold side upper printed circuit board heat exchange sheet and the cold side lower inlet arranged on the cold side lower printed circuit board heat exchange sheet through cooling liquid input pipes, and the cold side upper outlet arranged on the cold side upper printed circuit board heat exchange sheet and the cold side lower outlet arranged on the cold side lower printed circuit board heat exchange sheet are connected with the cooling liquid tank through cooling liquid output pipes.

[0035] In the embodiment, the hot side printed circuit board heat exchange sheet adopts the Tesla valve flow channel with one-way conduction characteristics, guides the smooth flow of lubricating oil, and significantly reduces the energy loss in the flow process. The cold side upper printed circuit board heat exchange sheet and the cold side lower printed circuit board heat exchange sheet adopt the cold side upper sawtooth flow channel and the cold side lower sawtooth flow channel respectively, guide the smooth flow of cooling liquid; the cold side upper sawtooth flow channel and the cold side lower sawtooth flow channel adopt the same sawtooth structure.

[0036] Specifically, in order to facilitate the recycling of the cooling liquid, the cooling liquid output pipe includes an upper horizontal pipe section, a vertical pipe section and a lower horizontal pipe section, the upper horizontal pipe section penetrates the side wall of the box, the vertical pipe section is located outside the box, and the lower horizontal pipe section penetrates into the box. The vertical pipe section reduces the temperature of the cooling liquid by air cooling. In order to further improve the cooling and heat dissipation effect of the vertical pipe section of the cooling liquid output pipe, a plurality of horizontal circular heat dissipation fins are uniformly arranged on the vertical pipe section of the cooling liquid output pipe. In order to further improve the cooling and heat dissipation effect of the vertical pipe section of the cooling liquid output pipe, a plurality of ventilation holes are arranged in a circular array on the circular heat dissipation fins. The ventilation holes can increase the air flow, so that the cold air can easily enter the inside of the fins, exchange heat with the heat source, and take away the heat. This helps to reduce the temperature of the heat source and improve the heat dissipation efficiency.

[0037] The utility model discloses a heating and cooling function integration, not only through the electromagnetic induction heating mode realizes the quick and even heating of lubricating oil, still through printed circuit board heat exchanger to avoid the problem that lubricating oil deteriorates due to the excessively high temperature of lubricating oil with water cooling heat exchange mode, realizes the stable and efficient operation of wind power equipment in the harsh environment.

[0038] The working principle of the utility model is as follows:

[0039] 1. Heat energy generation and heating: when the alternating current generated by the wind driven generator passes through the induction heating coil in the electromagnetic induction heating assembly, an alternating magnetic field is generated, which induces an electric current in the heating pipe, which in turn generates eddy current, and the heating pipe is heated, and the low-temperature lubricating oil in the heating pipe is heated.

[0040] 2. Venturi jet pipe premixing: the lubricating oil heated by the electromagnetic induction heating assembly enters the Venturi jet pipe through the return pipe, and the low-temperature lubricating oil in the oil inlet pipe is premixed and preheated in the Venturi jet pipe, which improves the flowability of the lubricating oil, and the premixing is beneficial to uniform heating.

[0041] 3. Temperature detection and control: the first temperature sensor and the second temperature sensor are equipped, and the temperature data is collected on the oil inlet pipe and the oil outlet pipe respectively and transmitted to the PLC controller. The controller controls the heating process according to the temperature data, adjusts the electromagnetic switch to open or close, so as to control the heating temperature of the electromagnetic induction heating assembly.

[0042] 4. Power allocation of heating process: preheating, heating and holding are adopted in three-stage mode to ensure the smooth progress of the heating process. Through the control of electromagnetic switch, independent power allocation of multiple induction heating coils is realized, and the heating efficiency and heat energy utilization rate are improved.

[0043] 5. Cooling treatment: when the lubricating oil temperature is too high, the PLC controller controls the electromagnetic three-way valve to reverse, so that the high temperature lubricating oil enters the printed circuit board heat exchanger from the input pipe, realizes the function of rapid cooling through the printed circuit board heat exchanger, uses the cooling liquid in the cooling liquid tank as the cooling medium, the circulating pump sends the cooling liquid in the cooling liquid tank into the printed circuit board heat exchanger, the cooling liquid absorbs the heat released by the high temperature lubricating oil, and after cooling by external air cooling, it flows back into the cooling liquid tank, so as to realize the whole cycle heat coverage management of the equipment, improve the working efficiency of the equipment, prevent the lubricating oil from overheating and deterioration, and ensure the stable and efficient operation of the equipment.

[0044] The above is the preferred embodiment of the utility model, which is used to explain the technical scheme of the utility model, and those skilled in the art can make routine modifications, equivalent replacement and improvement within the spirit and principles of the utility model.

Claims

1. An electromagnetic induction heating type gear box for a wind turbine generator, comprising a box body, an oil inlet pipe and an oil outlet pipe mounted on the top of the box body, characterized in that: The box is internally provided with an upper heat insulation plate, a Venturi jet pipe, an electromagnetic induction heating assembly, and an electromagnetic shunt valve.

2. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 1, wherein: The electromagnetic induction heating assembly comprises a heating pipe, which comprises a vertical preheating section, a horizontal heating section, and a vertical heat preservation section.

3. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 2, wherein: The oil inlet pipe is provided with an oil pump and a first temperature sensor, and the oil outlet pipe is provided with a second temperature sensor.

4. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 3, wherein: The box is internally provided with a lower heat insulation plate below the upper heat insulation plate, and the lower heat insulation plate is provided with a printed circuit board heat exchanger.

5. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 4, wherein: The heat side printed circuit board heat exchanger is internally and uniformly provided with a plurality of Tesla valve flow channels, which are communicated with the heat side inlet through heat side secondary shunt flow channels and communicated with the heat side outlet through heat side secondary collecting flow channels.

6. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 4, wherein: The lower surface of the upper cold side printed circuit board heat exchanger is uniformly provided with a plurality of upper cold side sawtooth flow channels, which are communicated with the upper cold side inlet through upper cold side secondary shunt flow channels and communicated with the upper cold side outlet through upper cold side secondary collecting flow channels.

7. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 4, wherein: The upper surface of the cold-side lower printed circuit board heat exchange fin is uniformly provided with a plurality of cold-side lower zigzag flow channels, the cold-side lower zigzag flow channels are communicated with the cold-side lower inlet through cold-side lower secondary branch flow channels, and the cold-side lower zigzag flow channels are communicated with the cold-side lower outlet through cold-side lower secondary collecting flow channels.

8. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 7, wherein: The cooling liquid output pipe comprises an upper horizontal pipe section, a vertical pipe section and a lower horizontal pipe section, the upper horizontal pipe section penetrates through the side wall of the box body, the vertical pipe section is located outside the box body, and the lower horizontal pipe section penetrates into the cold source chamber.

9. An electromagnetic induction heated gearbox for a wind turbine generator as claimed in claim 8, wherein: A plurality of horizontal circular heat dissipation fins are uniformly arranged on the vertical pipe section of the cooling liquid output pipe, and a plurality of ventilation holes are arranged in a circular array on the circular heat dissipation fins.

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