A heat dissipation system of a wind turbine generator and the wind turbine generator

Abstract

The application discloses a heat dissipation system of a wind turbine generator and the wind turbine generator. The heat dissipation system of the wind turbine generator comprises a cooling assembly, a heat dissipation refrigeration assembly and a phase change refrigeration device. The cooling assembly is formed with a cooling flow path. A fluid storage container is arranged on the cooling flow path. The fluid flowing through the cooling flow path is used to cool a heating component. The heat dissipation refrigeration assembly can be switched to form a heat dissipation flow path or a refrigeration flow path. One end of the heat dissipation flow path and the refrigeration flow path is communicated with the fluid storage container, and the other end is communicated with an adjustable volume part. The heat dissipation flow path at least flows through an out-cabin radiator. The phase change refrigeration device comprises a solid phase change part and a driving part for driving the phase change of the solid phase change part. The driving part is drivingly connected with a transmission shaft. The solid phase change part is in heat exchange with the refrigeration flow path. The heat dissipation system of the wind turbine generator provided by the application solves the problem that the existing heat dissipation system of the wind turbine generator is difficult to guarantee sufficient heat exchange requirement.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a heat dissipation system for a wind turbine and a wind turbine. Background Technology

[0002] Currently, the mainstream heat dissipation methods for heat-generating devices in the wind power industry are air-cooled contact heat exchange or water-cooled indirect heat exchange. The external cold source used is mainly air cooling, while offshore wind turbines can use seawater as a cold source to provide cooling capacity.

[0003] With the trend of large-megawatt wind turbine generators, the heat dissipation requirements of core heat-generating components such as gearboxes, generators, transformers, and converters are also increasing. Existing heat dissipation systems that utilize air cooling and water cooling are unable to guarantee sufficient heat exchange requirements, while methods such as vapor compression and semiconductor phase change refrigeration require additional input power and are less efficient. Summary of the Invention

[0004] The main objective of this invention is to propose a heat dissipation system and a wind turbine generator set, which aims to solve the problem that existing heat dissipation systems for wind turbine generator sets cannot guarantee sufficient heat exchange requirements.

[0005] To achieve the above objectives, the present invention proposes a heat dissipation system for a wind turbine generator, the wind turbine generator comprising a rotatably mounted drive shaft, blades disposed at the end of the drive shaft, and heat-generating components, the heat dissipation system for the wind turbine generator comprising:

[0006] A cooling assembly is provided with a cooling flow path, and a fluid storage container is provided on the cooling flow path. The fluid flowing through the cooling flow path is used to cool the heat-generating component.

[0007] A heat dissipation and cooling assembly, capable of switching between forming a heat dissipation flow path and a cooling flow path, wherein one end of each flow path is connected to the fluid storage container, and the other end is connected to an adjustable volume section; the heat dissipation flow path passes at least through an external radiator; and...

[0008] A phase change refrigeration device includes a solid phase change unit and a drive unit that drives the solid phase change unit to undergo a phase change. The drive unit is connected to the transmission shaft, and the solid phase change unit exchanges heat with the refrigeration flow path.

[0009] Specifically, the heat dissipation flow path is switched on the heat dissipation and cooling assembly, the volume of the adjustable volume section is increased, and the fluid in the fluid storage container flows through the heat dissipation flow path to the external radiator for heat dissipation, and then flows through the adjustable volume section.

[0010] The cooling flow path is switched on the heat dissipation and cooling assembly. The drive shaft rotates to drive the solid phase change part to undergo phase change cooling, and the volume of the adjustable volume part is reduced. The fluid in the adjustable volume part flows through the cooling flow path to absorb the cold energy of the solid phase change part and then flows back to the fluid storage container.

[0011] Optionally, the heat dissipation and cooling assembly has a first branch and a second branch arranged in parallel. The first branch has a first branch segment and a second branch segment arranged in series. The second branch has a third branch segment and a fourth branch segment arranged in series. The heat dissipation and cooling assembly also has a common flow path segment, which exchanges heat with the solid phase change section.

[0012] The heat dissipation and cooling assembly further includes a first switching device and / or a second switching device. The first switching device is used to switch the first branch segment to connect with the second branch segment or the common flow segment, so that the formed cooling flow path has different cooling flow paths. The second switching device is used to switch the third branch segment to connect with the fourth branch segment or the common flow segment, so that the formed heat dissipation flow path has different heat dissipation flow paths.

[0013] Selecting cooling flow paths with different cooling flow paths and / or combinations of heat dissipation flow paths with different heat dissipation flow paths, so that the heat dissipation system of the wind turbine has different cooling operating modes.

[0014] Optionally, the first switching device includes two first three-way valves, each of which includes three first connecting ports. Two of the first connecting ports of each first three-way valve are respectively connected to the common flow segment and the first branch segment, and the remaining first connecting port is connected to the second branch segment.

[0015] Optionally, the second switching device includes two second three-way valves, each of which includes three second connecting ports. Two of the second connecting ports of each second three-way valve are respectively connected to the common flow segment and the third branch segment, and the remaining second connecting port is connected to the fourth branch segment.

[0016] Optionally, two first directional valves are respectively provided on the portion of the first branch located on both sides of the second branch section, for unidirectional flow of fluid from the adjustable volume section to the fluid storage container; and / or,

[0017] Two second directional valves are respectively provided on the portion of the second branch located on both sides of the fourth branch section, for unidirectional flow of fluid from the fluid storage container to the adjustable volume section.

[0018] Optionally, the heat dissipation and cooling assembly includes a liquid storage tank and a piston rod movably installed inside the liquid storage tank;

[0019] The adjustable volume section includes the portion of the liquid storage cylinder located between the bottom wall of the liquid storage cylinder and the piston rod.

[0020] Optionally, a first eccentric wheel is driven to the transmission shaft, and the first eccentric wheel is driven to the piston rod to drive the piston rod to move.

[0021] Optionally, the adjustable volume section is connected to a gas storage container on its side, and an exhaust valve is provided between the gas storage container and the adjustable volume section.

[0022] Optionally, the drive unit includes a second eccentric wheel drivenly connected to the transmission shaft, and a push rod structure drivenly connected to the second eccentric wheel. The push rod structure has a linear travel and is drivenly connected to the solid phase change unit.

[0023] Optionally, the push rod structure includes:

[0024] The bearing rod, the upper end of which is connected to the second eccentric wheel drive; and,

[0025] The working rod is connected to the lower end of the pressure-bearing rod via a connecting part. Both the pressure-bearing rod and the working rod are movably and spaced within the connecting part to form an oil storage cavity at the interval. The oil storage cavity contains hydraulic oil. The working rod is driven to connect with the solid phase change part.

[0026] Optionally, the oil storage chamber is connected to an oil storage container, and a drain valve is provided between the oil storage container and the oil storage chamber.

[0027] Optionally, when the solid phase change section is subjected to a linear load from the push rod structure, the solid phase change section undergoes a forward phase change and releases latent heat; when the solid phase change section is unloaded from the push rod structure load, the solid phase change section undergoes a reverse phase change and absorbs latent heat, thus generating a cooling effect.

[0028] Optionally, the heat dissipation and cooling assembly includes a liquid storage tank and a piston rod movably installed inside the liquid storage tank. A first eccentric wheel is driven and connected to the transmission shaft, and the first eccentric wheel is driven and connected to the piston rod.

[0029] The piston rod and the push rod structure are located on the same side of the transmission shaft, and the phase difference between the first eccentric wheel and the second eccentric wheel is set at 180°, so that the movement direction of the push rod structure is opposite to that of the piston rod.

[0030] Optionally, a fluid pump is also provided in the cooling flow path, and the outlet of the fluid storage container is connected to the inlet of the fluid pump. The fluid pump is used to drive the fluid in the fluid storage container to flow through the cooling flow path to cool the heat-generating component.

[0031] Optionally, the cooling assembly further includes a heat exchanger disposed in the cooling flow path, the outlet of the fluid pump being connected to the inlet of the heat exchanger, the heat exchanger being disposed corresponding to the heat-generating component, so that after the fluid pump drives the fluid to flow to the heat exchanger, the heat exchanger cools the heat-generating component through the fluid.

[0032] Optionally, multiple heat exchangers are provided, and a cooling capacity distribution device is provided between the multiple heat exchangers and the fluid pump to distribute the fluid flowing through the cooling capacity distribution device to each heat exchanger.

[0033] The present invention also provides a wind turbine generator, the wind turbine generator including the above-mentioned heat dissipation system of the wind turbine generator, the heat dissipation system of the wind turbine generator including at least:

[0034] A cooling assembly is provided with a cooling flow path, and a fluid storage container is provided on the cooling flow path. The fluid flowing through the cooling flow path is used to cool the heat-generating component.

[0035] A heat dissipation and cooling assembly, capable of switching between forming a heat dissipation flow path and a cooling flow path, wherein one end of each flow path is connected to the fluid storage container, and the other end is connected to an adjustable volume section; the heat dissipation flow path passes at least through an external radiator; and...

[0036] A phase change refrigeration device includes a solid phase change unit and a drive unit that drives the solid phase change unit to undergo a phase change. The drive unit is connected to the transmission shaft, and the solid phase change unit exchanges heat with the refrigeration flow path.

[0037] Specifically, the heat dissipation flow path is switched on the heat dissipation and cooling assembly, the volume of the adjustable volume section is increased, and the fluid in the fluid storage container flows through the heat dissipation flow path to the external radiator for heat dissipation, and then flows through the adjustable volume section.

[0038] The cooling flow path is switched on the heat dissipation and cooling assembly. The drive shaft rotates to drive the solid phase change part to undergo phase change cooling, and the volume of the adjustable volume part is reduced. The fluid in the adjustable volume part flows through the cooling flow path to absorb the cold energy of the solid phase change part and then flows back to the fluid storage container.

[0039] In the technical solution provided by this invention, during the cooling process of the heat-generating component, the driving unit drives the solid-state phase change unit to perform phase change cooling, reduces the volume of the adjustable volume unit to increase the pressure, causing the fluid in the adjustable volume unit to flow through the cooling flow path to absorb the cold energy of the solid-state phase change unit, and then flows into the fluid storage container. It then exchanges heat with the heat-generating component through the cooling flow path to cool the heat-generating component. After the fluid cools the heat-generating component, it is necessary to dissipate heat from the heated fluid. The heat dissipation and cooling assembly switches to form a heat dissipation flow path, increases the volume of the adjustable volume unit to reduce the pressure, causing the fluid in the fluid storage container to flow through the heat dissipation flow path to the external radiator for heat dissipation, and then flows into the adjustable volume unit, thereby completing the heat dissipation of the fluid and facilitating fluid recycling. By combining phase change cooling technology, this invention can further improve heat dissipation compared to existing heat dissipation systems that use natural cold sources, thus providing sufficient heat exchange capacity. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an embodiment of the heat dissipation system for a wind turbine provided by the present invention.

[0042] Explanation of icon numbers:

[0043]

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0048] Currently, the mainstream heat dissipation methods for heat-generating devices in the wind power industry are air-cooled contact heat exchange or water-cooled indirect heat exchange. The external cold source used is mainly air cooling, while offshore wind turbines can use seawater as a cold source to provide cooling capacity.

[0049] With the trend of large-megawatt wind turbine generators, the heat dissipation requirements of core heat-generating components such as gearboxes, generators, transformers, and converters are also increasing. Existing heat dissipation systems that utilize air cooling and water cooling are unable to guarantee sufficient heat exchange requirements, while methods such as vapor compression and semiconductor phase change refrigeration require additional input power and are less efficient.

[0050] To address the aforementioned problems, this invention provides a heat dissipation system for a wind turbine and a wind turbine itself. Figure 1 This is a specific embodiment of the heat dissipation system for wind turbine generators provided by the present invention.

[0051] Please see Figure 1The cooling system 100 of the wind turbine includes a cooling component 1, a heat dissipation and refrigeration component 2, and a phase change refrigeration device 3. The cooling component 1 forms a cooling flow path 11, and a fluid storage container 12 is provided on the cooling flow path 11. The fluid flowing through the cooling flow path 11 is used to cool the heat-generating component 6. The heat dissipation and refrigeration component 2 can be switched to form a heat dissipation flow path 22 or a refrigeration flow path 21. One end of the heat dissipation flow path 22 and the refrigeration flow path 21 are both connected to the fluid storage container 12, and the other end is connected to an adjustable volume section 24. The heat dissipation flow path 22 flows through at least the external radiator 25. The phase change refrigeration device 3 includes a solid phase change section 31 and a driving section 32 for driving the phase change of the solid phase change section 31. The drive unit 32 drives and connects to the transmission shaft 4. The solid phase change unit 31 exchanges heat with the cooling flow path 21. The cooling flow path 22 is formed on the heat dissipation and cooling assembly 2, increasing the volume of the adjustable volume part 24. The fluid in the fluid storage container 12 flows through the cooling flow path 22 to the external radiator 25 for heat dissipation, and then flows through the adjustable volume part 24. The cooling flow path 21 is formed on the heat dissipation and cooling assembly 2. The transmission shaft 4 rotates, driving the solid phase change unit 31 to undergo phase change cooling, decreasing the volume of the adjustable volume part 24. The fluid in the adjustable volume part 24 flows through the cooling flow path 21 to absorb the cold energy of the solid phase change unit 31, and then flows back to the fluid storage container 12.

[0052] In the technical solution provided by this invention, during the cooling process of the heating element 6, the driving unit 32 drives the solid-state phase change unit 31 to undergo phase change cooling, reducing the volume of the adjustable volume unit 24 to increase the pressure. This causes the fluid in the adjustable volume unit 24 to flow through the cooling flow path 21, absorb the cooling energy of the solid-state phase change unit 31, and then flow into the fluid storage container 12. The fluid then exchanges heat with the heating element 6 through the cooling flow path 11 to cool the heating element 6. After the fluid has cooled the heating element 6, it is necessary to adjust the pressure. After the fluid is cooled, the cooling component 2 switches to form a cooling flow path 22, and the volume of the adjustable volume section 24 is increased to reduce the pressure so that the fluid in the fluid storage container 12 flows through the cooling flow path 22 to the external radiator 25 for cooling, and then flows through the adjustable volume section 24, thereby completing the cooling of the fluid and facilitating the recycling of the fluid. By combining phase change refrigeration technology, this invention can further improve the heat dissipation compared with the existing cooling system that uses natural cold source refrigeration to provide sufficient heat exchange requirements.

[0053] It is worth mentioning that when the heat dissipation demand is small, the heat dissipation system 100 of the wind turbine provided by the present invention can also adopt the heat dissipation method of natural cold source. The heat dissipation and cooling component 2 switches to form the heat dissipation flow path 22. By increasing the adjustable volume part 24, the fluid in the fluid storage container 12 is driven to flow through the heat dissipation flow path 22 to the external radiator 25 for heat dissipation, and then flows through the adjustable volume part 24. Then, by switching the heat dissipation and cooling component 2 to form the cooling flow path 21, the fluid in the adjustable volume part 24 after heat dissipation is driven to flow through the fluid storage container 12 and then through the cooling flow path 11 to cool the heat-generating component 6.

[0054] Specifically, in this embodiment, when the solid phase change part 31 is subjected to the linear load of the push rod structure 322, the solid phase change part 31 undergoes a forward phase change and releases latent heat; when the solid phase change part 31 is unloaded by the push rod structure 322, the solid phase change part 31 undergoes a reverse phase change and absorbs latent heat, thereby generating a cooling effect. The cooling principle of the solid phase transformation section 31 is as follows: Cooling is achieved by utilizing the latent heat of the martensite-austenite micro-phase transformation. After being driven by a stress load, the solid phase transformation section 31 undergoes a positive phase transformation, changing from a solid austenite phase to a solid martensite phase. During this phase transformation, the latent heat of the solid phase transformation section 31 is released, and the temperature of the solid phase transformation material increases. When the stress on the solid phase transformation section 31 is unloaded, it changes from a martensite phase to an austenite phase, absorbing latent heat and decreasing its temperature, thus achieving a cooling effect. Furthermore, in this embodiment, the solid phase transformation section 31 directly contacts the cooling flow path 21 for heat exchange, which can improve heat exchange efficiency. This heat exchange form can be internal pipe flow heat exchange, external pipe flow heat exchange, sheet-like external flow heat exchange, filament-like external flow heat exchange, etc.

[0055] It should be noted that the material and shape of the solid phase change part 31 used in this invention are not specifically limited. It can be a solid alloy phase change material, such as nickel-titanium based, copper-based, or iron-based alloys. The shape can be sheet-like, tubular, or filament-like. It can also be a material such as natural rubber, as long as it can generate a phase change under the drive of the drive part 32 to achieve the cooling effect. Moreover, this invention does not specifically limit the driving form of the solid phase change part 31. The stress type driving the solid phase change part 31 can be tension or compression. For example, compression is used in this embodiment.

[0056] Considering that the solid-state phase change unit 31 releases latent heat first and then absorbs latent heat for cooling during phase change, the heat dissipation circuit can also exchange heat with the solid-state phase change unit 31, thus forming multiple different cooling modes. In this embodiment, the heat dissipation and cooling assembly 2 has a first branch 211 and a second branch 221 arranged in parallel. The first branch 211 has a first branch segment 2111 and a second branch segment 2112 arranged in series. The second branch 221 has a third branch segment 2211 and a fourth branch segment 2212 arranged in series. The heat dissipation and cooling assembly 2 also has a common flow path segment 23, which exchanges heat with the solid-state phase change unit 31. The heat dissipation and cooling assembly 2 also includes a first cut The first switching device 26 is used to switch the first branch segment 2111 to connect with the second branch segment 2112 or the common flow path segment 23, so that the formed cooling flow path 21 has different cooling flow paths. The second switching device 27 is used to switch the third branch segment 2211 to connect with the fourth branch segment 2212 or the common flow path segment 23, so that the formed heat dissipation flow path 22 has different heat dissipation flow paths. The combination of cooling flow path 21 with different cooling flow paths and / or heat dissipation flow path 22 with different heat dissipation flow paths is selected to enable the cooling system 100 of the wind turbine to have different cooling operating modes.

[0057] Specifically, when the first switching device 26 switches the first branch segment 2111 to connect with the second branch segment 2112, and the second switching device 27 switches the third branch segment 2211 to connect with the fourth branch segment 2212, the cooling system 100 of the wind turbine is in forced cooling mode. The working process is as follows: the adjustable volume section 24 is increased, driving the fluid in the fluid storage container 12 to flow through the fourth branch segment 2212 and the third branch segment 2211, and after being cooled by the external radiator 25, it flows into the adjustable volume section 24. Then the adjustable volume section 24 is decreased, driving the cooled fluid in the adjustable volume section 24 to flow through the first branch segment 2111 and the second branch segment 2112 into the fluid storage container 12, and then flowing through the cooling flow path 11 to cool the heat-generating component 6.

[0058] When the first switching device 26 switches the first branch segment 2111 to connect with the common flow segment 23, and the second switching device 27 switches the third branch segment 2211 to connect with the common flow segment 23, the cooling system 100 of the wind turbine is in solid-state phase change cooling mode. The working process is as follows: the solid-state phase change unit 31 is driven to undergo phase change by the driving unit 32. When the solid-state phase change unit 31 releases latent heat during phase change, the adjustable volume unit 24 is increased, driving the fluid in the fluid storage container 12 to flow through the fourth branch segment 2212 and the common flow segment 23. The fluid absorbs the solid-state phase change when passing through the common flow segment 23. The latent heat released by the solid phase change section 31 is dissipated as the fluid passes through the external radiator 25, and finally flows into the adjustable volume section 24. When the solid phase change section 31 absorbs the latent heat, the adjustable volume section 24 is reduced, driving the cooled fluid in the adjustable volume section 24 to flow through the first branch section 2111 to the common flow section 23. When the fluid passes through the common flow section 23, the solid phase change section 31 absorbs the latent heat to cool the fluid. After cooling, the fluid flows through the fluid storage container 12 and through the cooling flow path 11 to cool the heat-generating component 6. Compared with the heat dissipation method of natural cold source, the cooling effect of the cooled fluid is better.

[0059] The effects of the other two heat dissipation flow path combinations 22 are similar to the two mentioned above, and will not be elaborated on here.

[0060] It should be noted that the present invention does not impose specific limitations on the specific form of the first switching device 26, which can be a reversing valve, an electromagnetic reversing valve, a flow divider valve, or a combination of multiple valves, etc. In this embodiment, the first switching device 26 includes two first three-way valves 261, each of which includes three first connecting ports. Two of the first connecting ports of each first three-way valve 261 are respectively connected to the common flow path section 23 and the first branch section 2111, and the remaining first connecting port is connected to the second branch section 2112. By adjusting the opening and closing of each first connecting port, the flow path can be switched. Moreover, the three-way valve structure is simple and the cost is low.

[0061] Similarly, the present invention does not impose specific limitations on the specific form of the second switching device 27, which can be a reversing valve, a solenoid reversing valve, a flow divider valve, or a combination of multiple valves, etc. In this embodiment, the second switching device 27 includes two second three-way valves 271, each of which includes three second connecting ports. Two of the second connecting ports of each second three-way valve 271 are respectively connected to the common flow path section 23 and the first branch section 2111, and the remaining second connecting port is connected to the second branch section 2112. By adjusting the opening and closing of each second connecting port, the flow path can be switched. Moreover, the three-way valve structure is simple and the cost is low.

[0062] Furthermore, to prevent fluid backflow in the first branch 211, which would affect fluid flow and heat exchange, and to determine the flow direction of the first branch 211, in this embodiment, first directional valves 28 are respectively provided on the portions of the first branch 211 located on both sides of the second branch segment 2112 to unidirectionally guide fluid from the adjustable volume section 24 to the fluid storage container 12. Similarly, second directional valves 29 are respectively provided on the portions of the second branch 221 located on both sides of the fourth branch segment 2212 to unidirectionally guide fluid from the fluid storage container 12 to the adjustable volume section 24. Likewise, to prevent fluid backflow in the second branch 211... The backflow of fluid in 21 affects the flow and heat exchange effect of the fluid, thereby determining the flow direction of the second branch 221. The second branch 221 is provided with a second directional valve 29 on both sides of the fourth branch section 2212 to unidirectionally guide the fluid from the fluid storage container 12 to the adjustable volume section 24. It is worth mentioning that when the first directional valve 28 and the second directional valve 29 are provided at the same time, the flow directions of the first branch 211 and the second branch 221 can be kept opposite, improving the efficiency of fluid flow, thereby improving the overall cooling and heat dissipation efficiency of the wind turbine's heat dissipation system 100.

[0063] To facilitate adjustment of the volume within the adjustable volume section 24, in this embodiment, the heat dissipation and cooling assembly 2 includes a liquid storage cylinder 201 and a piston rod 202 movably installed within the liquid storage cylinder 201. The adjustable volume section 24 includes the portion of the liquid storage cylinder 201 located between the bottom wall of the liquid storage cylinder 201 and the piston rod 202. Thus, the volume of the portion between the bottom wall of the liquid storage cylinder 201 and the piston rod 202 can be changed by moving the piston rod 202, thereby adjusting the volume within the adjustable volume section 24.

[0064] Considering that a driving device is required when adjusting the volume of the adjustable volume section 24, in order to save energy, in this embodiment, a first eccentric wheel 203 is driven to the transmission shaft 4. The first eccentric wheel 203 is driven to the piston rod 202 to drive the piston rod 202. Since the transmission shaft 4 is driven by wind power, which is a clean energy source, there is no need to add an additional driving rod device, thus achieving an energy-saving effect. It can be understood that the component driving the piston rod 202 can also be a first bearing mounted on the first eccentric wheel 203, driven to the piston rod 202 through the first bearing. The first bearing can be a rolling ball bearing, a sliding bearing, etc., to improve transmission efficiency.

[0065] It is understandable that because the first eccentric wheel 203 is driven and connected to the transmission shaft 4, it is difficult to stop the rotation of the eccentric wheel. When it is not necessary to cool the wind turbine, it will still drive the piston rod 202 to move to drive the fluid flow. Therefore, in this embodiment, the adjustable volume part 24 is connected to the gas storage container 204 on the side. An exhaust valve 205 is provided between the gas storage container 204 and the adjustable volume part 24. When it is not necessary to drive the fluid to flow in the flow path, the exhaust valve 205 can be opened to relieve pressure and prevent pressure difference from causing the fluid to flow in the flow path.

[0066] Considering that the solid-state phase change unit 31 requires a stress source as a drive during phase change, traditional solid-state phase change refrigeration requires a motor or universal testing machine as a drive source, making the equipment relatively bulky. In this embodiment, the drive unit 32 includes a second eccentric wheel 321 driven and connected to the transmission shaft 4, and a push rod structure 322 driven and connected to the second eccentric wheel 321. The push rod structure 322 has a linear travel and is driven and connected to the solid-state phase change unit 31. In this way, the power system of the wind turbine is combined with the drive unit 32, eliminating the need for an additional energy-consuming motor or universal testing machine. Only an eccentric transmission component is needed to apply the stress required for phase change to the solid-state phase change material. Furthermore, the force exerted by the solid-state phase change unit 31 during stress unloading can be directly recovered to the transmission shaft 4, further improving the energy-saving effect.

[0067] Furthermore, it is worth mentioning that in some embodiments provided by the present invention, two phase change refrigeration devices 3 can be provided, and the phase difference between the two second eccentric wheels 321 mechanisms in the two phase change refrigeration devices 3 is set at 180°. In this way, when one of the solid phase change parts 31 is subjected to stress load, the other solid phase change part 31 is subjected to stress unloading, which improves the heat exchange efficiency and keeps the force transmitted by the transmission shaft 4 to the motor balanced.

[0068] Considering the significant distance between the second eccentric wheel 321 and the solid-state phase change part 31, which results in a long push rod structure 322 affecting stress transmission efficiency, in this embodiment, the push rod structure 322 includes a pressure-bearing rod 3221 and a working rod 3222. The upper end of the pressure-bearing rod 3221 is driven to connect with the second eccentric wheel 321, and the working rod 3222 is connected to the lower end of the pressure-bearing rod 3221 via a connecting part 3223. Both the pressure-bearing rod 3221 and the working rod 3222 are movably spaced within the connecting part 3223 to form an oil storage cavity 3224 at the interval. The oil storage cavity 3224 contains hydraulic oil, and the working rod 3222 is driven to connect with the solid-state phase change part 31. Thus, by connecting the pressure-bearing rod 3221 and the working rod 3222 with hydraulic oil, the length of the pressure-bearing rod 3221 can be reduced, thereby improving stress transmission efficiency.

[0069] Furthermore, since the second eccentric wheel 321 is driven and connected to the transmission shaft 4, it is difficult to stop the rotation of the eccentric wheel. Even when it is not necessary to drive the solid phase change part 31 to change phase, the push rod structure 322 will still be driven to move, thereby driving the solid phase change part 31 to change phase. Therefore, in this embodiment, the oil storage chamber 3224 is connected to the oil storage container 33, and a drain valve 34 is provided between the oil storage container 33 and the oil storage chamber 3224. When it is not necessary to drive the solid phase change part 31 to change phase, the drain valve 34 can be opened. In this way, after the pressure rod 3221 is driven by the second eccentric wheel 321, the hydraulic oil will flow between the oil storage chamber 3224 and the oil storage container 33, and the stress will not be transmitted to the working rod 3222, and thus the solid phase change part 31 will not be driven to change phase.

[0070] It is worth mentioning that, in this embodiment, the piston rod 202 and the push rod structure 322 are located on the same side of the transmission shaft 4, and the phase difference between the first eccentric wheel 203 and the second eccentric wheel 321 is set at 180°, so that the push rod structure 322 and the piston rod 202 move in opposite directions. This allows the phase change refrigeration device 3 and the heat dissipation refrigeration assembly 2 to work together to dissipate heat. For example, please refer to... Figure 1While the second eccentric wheel 321 drives the push rod mechanism to move downward to compress the solid phase change section 31 and generate latent heat, the first eccentric wheel 203 moves upward to increase the volume of the adjustable volume section 24, thereby driving the fluid from the fluid storage container 12 through the common flow path 23 and the third branch section 2211. During this process, when flowing through the common flow path 23, the fluid exchanges heat with the solid phase change section 31 to absorb the generated latent heat, and after flowing through the external radiator 25, it flows back to the adjustable volume section 24. 1. The push rod mechanism is driven to move upward so that the solid phase change part 31 can absorb latent heat by absorbing stress. At the same time, the first eccentric wheel 203 moves downward to reduce the volume in the adjustable volume part 24, so as to drive the fluid from the adjustable volume part 24 through the first branch section 2111 and the common flow section 23. During the process, when flowing through the common flow section 23, it will exchange heat with the solid phase change part 31 to absorb the generated cold energy, and after flowing through the fluid storage container 12, it will flow through the cooling flow path 11 to cool the heat-generating component 6, thereby improving the cooling efficiency.

[0071] In this embodiment, a fluid pump 13 is also provided on the cooling flow path 11. The outlet of the fluid storage container 12 is connected to the inlet of the fluid pump 13. The fluid pump 13 is used to drive the fluid in the fluid storage container 12 to flow through the cooling flow path 11 to cool the heat-generating component 6. In this way, a greater driving force is provided for the fluid flowing through the cooling flow path 11. Moreover, with this configuration, when the fluid storage container 12 is filled with fluid, the fluid pump 13 can be activated to drive the fluid in the fluid storage container 12 to flow through the cooling flow path 11 to cool the heat-generating component 6, thereby achieving rapid cooling and being able to cope with emergencies.

[0072] Furthermore, considering that the fluid flowing to the heating element 6 also needs to flow back to the fluid storage container 12, in this embodiment, the cooling assembly 1 further includes a heat exchanger 14 disposed in the cooling flow path 11. The outlet of the fluid pump 13 is connected to the inlet of the heat exchanger 14. The heat exchanger 14 is disposed corresponding to the heating element 6 so that after the fluid pump 13 drives the fluid to flow to the heat exchanger 14, the heat exchanger 14 cools the heating element 6 through the fluid. The heat exchanger 14 can cool the heating element 6 to a certain temperature.

[0073] It should be noted that the heat-generating component 6 of the wind turbine unit has multiple components, for example, in this embodiment, see [reference]. Figure 1The heating components 6, from left to right, are a gearbox, a generator, and a transformer. Therefore, in this embodiment, multiple heat exchangers 14 are provided, and multiple heat exchangers 14 can be provided corresponding to multiple heating components 6. A cooling capacity distribution device 15 is provided between the multiple heat exchangers 14 and the fluid pump 13 to distribute the fluid flowing through the cooling capacity distribution device 15 to each heat exchanger 14, so that the cooling method is targeted.

[0074] The present invention also provides a wind turbine generator set, including the above-mentioned wind turbine generator set heat dissipation system 100. The wind turbine generator set includes all the technical features of the above-mentioned wind turbine generator set heat dissipation system 100, and therefore also has the technical effects brought about by all the above-mentioned technical features, which will not be described in detail here.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A heat dissipation system for a wind turbine generator, the wind turbine generator comprising a rotatably mounted drive shaft (4), blades (5) disposed at the end of the drive shaft (4), and a heat-generating component (6), characterized in that, The cooling system of the wind turbine includes: A cooling assembly (1) is formed with a cooling flow path (11), and a fluid storage container (12) is provided on the cooling flow path (11). The fluid flowing through the cooling flow path (11) is used to cool the heat-generating component (6). A heat dissipation and cooling assembly (2) is capable of switching between forming a heat dissipation flow path (22) or a cooling flow path (21). One end of both the heat dissipation flow path (22) and the cooling flow path (21) is connected to the fluid storage container (12), and the other end is connected to the adjustable volume section (24). The heat dissipation flow path (22) flows through at least the external radiator (25). The phase change refrigeration device (3) includes a solid phase change part (31) and a drive part (32) for driving the solid phase change part (31) to change phase. The drive part (32) drives the transmission shaft (4) and the solid phase change part (31) exchanges heat with the refrigeration flow path (21). In this process, the heat dissipation flow path (22) is switched to form on the heat dissipation and cooling assembly (2), the volume of the adjustable volume section (24) is increased, and the fluid in the fluid storage container (12) flows through the heat dissipation flow path (22) to the external radiator (25) for heat dissipation, and then flows through the adjustable volume section (24). The cooling flow path (21) is switched on the heat dissipation and cooling assembly (2). The drive shaft (4) rotates and drives the solid phase change part (31) to perform phase change cooling. The volume of the adjustable volume part (24) is reduced. The fluid in the adjustable volume part (24) flows through the cooling flow path (21) to absorb the cold energy of the solid phase change part (31) and then flows back to the fluid storage container (12). The heat dissipation and cooling assembly (2) has a first branch (211) and a second branch (221) arranged in parallel. The first branch (211) has a first branch segment (2111) and a second branch segment (2112) arranged in series. The second branch (221) has a third branch segment (2211) and a fourth branch segment (2212) arranged in series. The heat dissipation and cooling assembly (2) also has a common flow path segment (23) that exchanges heat with the solid phase change part (31). The heat dissipation and cooling assembly (2) further includes a first switching device (26) and / or a second switching device (27). The first switching device (26) is used to switch the first branch segment (2111) to connect with the second branch segment (2112) or the common flow path segment (23) so that the formed cooling flow path (21) has different cooling flow paths. The second switching device (27) is used to switch the third branch segment (2211) to connect with the fourth branch segment (2212) or the common flow path segment (23) so that the formed heat dissipation flow path (22) has different heat dissipation flow paths. Selecting a combination of cooling flow path (21) with different cooling flow paths and / or heat dissipation flow path (22) with different heat dissipation flow paths, so that the heat dissipation system of the wind turbine has different cooling operating modes.

2. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, The first switching device (26) includes two first three-way valves (261), each of the first three-way valves (261) includes three first connecting ports, two of the first connecting ports of each first three-way valve (261) are respectively connected to the common flow section (23) and the first branch section (2111), and the remaining first connecting port is connected to the second branch section (2112).

3. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, The second switching device (27) includes two second three-way valves (271), each of the second three-way valves (271) includes three second connecting ports, two of the second connecting ports of each second three-way valve (271) are respectively connected to the common flow section (23) and the third branch section (2211), and the remaining second connecting port is connected to the fourth branch section (2212).

4. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, Two first directional valves (28) are respectively provided on the portion of the first branch (211) located on both sides of the second branch section (2112) to unidirectionally guide fluid from the adjustable volume section (24) to the fluid storage container (12); and / or, Two second directional valves (29) are respectively provided on the second branch (221) at the portions on both sides of the fourth branch section (2212) to unidirectionally guide fluid from the fluid storage container (12) to the adjustable volume section (24).

5. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, The heat dissipation and cooling assembly (2) includes a liquid storage tank (201) and a piston rod (202) movably installed inside the liquid storage tank (201); The adjustable volume section (24) includes the portion of the liquid storage cylinder (201) located between the bottom wall of the liquid storage cylinder (201) and the piston rod (202).

6. The heat dissipation system of the wind turbine generator as described in claim 5, characterized in that, A first eccentric wheel (203) is driven to the transmission shaft (4), and the first eccentric wheel (203) is driven to the piston rod (202) to drive the piston rod (202) to move.

7. The heat dissipation system of the wind turbine generator as described in claim 6, characterized in that, The adjustable volume section (24) is connected to a gas storage container (204) on its side, and an exhaust valve (205) is provided between the gas storage container (204) and the adjustable volume section (24).

8. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, The drive unit (32) includes a second eccentric wheel (321) that is driven to be connected to the transmission shaft (4), and a push rod structure (322) that is driven to be connected to the second eccentric wheel (321). The push rod structure (322) has a linear travel and is driven to be connected to the solid phase change unit (31).

9. The heat dissipation system of the wind turbine generator as described in claim 8, characterized in that, The push rod structure (322) includes: The bearing rod (3221) is driven at its upper end to the second eccentric wheel (321); and, The working rod (3222) is connected to the lower end of the pressure rod (3221) via the connecting part (3223). The pressure rod (3221) and the working rod (3222) are both movably spaced within the connecting part (3223) to form an oil storage cavity (3224) at the interval. The oil storage cavity (3224) is filled with hydraulic oil. The working rod (3222) is driven to connect with the solid phase change part (31).

10. The heat dissipation system of the wind turbine generator as described in claim 9, characterized in that, The oil storage chamber (3224) is connected to an oil storage container (33), and a drain valve (34) is provided between the oil storage container (33) and the oil storage chamber (3224).

11. The heat dissipation system of the wind turbine generator as described in claim 8, characterized in that, When the solid phase change part (31) is subjected to the linear load of the push rod structure (322), the solid phase change part (31) undergoes a positive phase change and releases latent heat; when the solid phase change part (31) is unloaded by the push rod structure (322), the solid phase change part (31) undergoes a reverse phase change and absorbs latent heat, thus generating a cooling effect.

12. The heat dissipation system of the wind turbine generator as described in claim 8, characterized in that, The heat dissipation and cooling assembly (2) includes a liquid storage tank (201) and a piston rod (202) movably installed inside the liquid storage tank (201). A first eccentric wheel (203) is driven and connected to the transmission shaft (4), and the first eccentric wheel (203) is driven and connected to the piston rod (202). The piston rod (202) and the push rod structure (322) are located on the same side of the transmission shaft (4), and the phase difference between the first eccentric wheel (203) and the second eccentric wheel (321) is set at 180°, so that the push rod structure (322) and the piston rod (202) move in opposite directions.

13. The heat dissipation system of the wind turbine generator as described in claim 1, characterized in that, A fluid pump (13) is also provided on the cooling flow path (11). The outlet of the fluid storage container (12) is connected to the inlet of the fluid pump (13). The fluid pump (13) is used to drive the fluid in the fluid storage container (12) to flow through the cooling flow path (11) to cool the heat-generating component (6).

14. The heat dissipation system of the wind turbine generator as described in claim 13, characterized in that, The cooling assembly (1) further includes a heat exchanger (14) disposed in the cooling flow path (11). The outlet of the fluid pump (13) is connected to the inlet of the heat exchanger (14). The heat exchanger (14) is disposed corresponding to the heat-generating component (6) so that after the fluid pump (13) drives the fluid to flow to the heat exchanger (14), the heat exchanger (14) cools the heat-generating component (6) through the fluid.

15. The heat dissipation system of the wind turbine generator as described in claim 14, characterized in that, Multiple heat exchangers (14) are provided, and a cooling capacity distribution device (15) is provided between the multiple heat exchangers (14) and the fluid pump (13) to distribute the fluid flowing through the cooling capacity distribution device (15) to each heat exchanger (14).

16. A wind turbine generator set, characterized in that, The wind turbine includes a cooling system (100) as described in any one of claims 1 to 15.

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