Cooling system for converter of wind generating set and converter

Abstract

The invention relates to a cooling system for a converter of a wind generating set and the converter, the cooling system comprises a shell, a turbulent flow assembly and a cooling assembly, the shell is provided with a containing cavity, the containing cavity is provided with a first cavity and a second cavity which are communicated in the first direction, the first cavity is configured to be capable of containing a liquid cooling medium, and the second cavity is configured to be capable of containing a liquid cooling medium; the turbulent flow assembly is connected to the first cavity of the shell and used for guiding a cooling medium to flow in the first cavity and conduct heat exchange with the converter, and the cooling assembly is connected to the second cavity of the shell and used for converting part of the cooling medium into cooling liquid drops and enabling the cooling liquid drops to flow back to the first cavity. According to the cooling system, corrosion of the cooling medium to the internal structure of the cooling system can be reduced, meanwhile, the heat exchange efficiency of the cooling system is improved, and the cooling effect of the converter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and particularly to a cooling system and an inverter for a wind turbine generator set. Background Art

[0002] The inverter of a wind turbine generator set is a device that converts the electrical energy with non-standard frequency and non-standard voltage generated by the generator of the wind turbine generator set into the electrical energy with the frequency and voltage required by the power grid. With the development of the large-scale of the unit, the inverter is continuously increased in capacity and the power density is increased, which makes the heat flux density of each device in the inverter increase. Therefore, a cooling system needs to be set up to take away the heat generated by the inverter in time.

[0003] Evaporative cooling is an effective method for cooling electronic devices. In the prior art, the evaporative cooling method has been applied to including high-power inverters to utilize the latent heat of vaporization of a low-boiling-point cooling medium to achieve heat exchange of the inverter. However, the cooling medium in the cooling system will repeatedly perform an evaporation-condensation cycle, which will cause corrosion or blockage of the cooling system after long-term operation, seriously affecting the heat exchange capacity. Summary of the Invention

[0004] The present application provides a cooling system and an inverter for a wind turbine generator set, which can reduce the corrosion of the internal structure of the cooling system by the cooling medium while improving the heat exchange efficiency of the cooling system and the cooling effect of the inverter.

[0005] On the one hand, according to an embodiment of the present application, a cooling system for an inverter of a wind turbine generator set is proposed. The cooling system includes: a housing having a receiving cavity, the receiving cavity including a first cavity and a second cavity connected in communication along a first direction, the first cavity being configured to be capable of accommodating a liquid cooling medium; a flow disturbing component connected to the first cavity of the housing, the flow disturbing component being used for guiding the cooling medium to flow in the first cavity and performing heat exchange with the inverter; a cooling component connected to the second cavity of the housing, the cooling component being used for converting a part of the cooling medium into coolant droplets and flowing back to the first cavity.

[0006] According to an aspect of an embodiment of the present application, the flow disturbing component includes a first pump body, a suction pipeline and a return pipeline. The suction pipeline and the return pipeline are respectively connected to the first cavity of the housing. The first pump body is arranged between the suction pipeline and the return pipeline and is used for driving the cooling medium to circulate in a loop formed by the first cavity, the suction pipeline and the return pipeline.

[0007] According to an aspect of an embodiment of the present application, the first pump body is located on a side of the first cavity away from the second cavity and is spaced from the first cavity in the first direction.

[0008] According to an aspect of an embodiment of the present application, the diameter of the suction pipeline is larger than the diameter of the return pipeline.

[0009] According to one aspect of an embodiment of the present application, the first pump body includes more than two pump stations, which are arranged at intervals between the suction pipe and the return pipe and are used to pressurize the cooling medium in the loop.

[0010] According to one aspect of an embodiment of the present application, it also includes: a mounting bracket for mounting the inverter, the mounting bracket is mounted in the first cavity of the shell and can be configured to be immersed in the cooling medium; and the mounting angle between the mounting bracket and the shell is fixed or adjustable.

[0011] According to one aspect of an embodiment of the present application, it also includes a substrate, which is disposed in the accommodating cavity and separates the first cavity from the second cavity to form a third cavity, and the third cavity is used to accommodate the converter.

[0012] According to one aspect of an embodiment of the present application, the shell includes an inner shell and an outer shell arranged outside the inner shell, the inner shell forms a accommodating chamber, and the outer shell and the inner shell are configured to form a low-pressure chamber, wherein the pressure of the low-pressure chamber is lower than the pressure of the accommodating chamber.

[0013] According to one aspect of the embodiment of the present application, the cooling component is configured as a condenser, which is disposed in the second cavity; and the condenser is configured to condense the cooling medium evaporated to the second cavity from a gaseous state to form a plurality of cooling droplets.

[0014] According to one aspect of an embodiment of the present application, the cooling component includes a nozzle, a connecting pipe and a second pump body. The nozzle is arranged in the second cavity of the shell. One end of the connecting pipe is connected to the nozzle, and the other end is connected to the cooling medium of the first cavity through the second pump body, so as to draw part of the cooling medium of the first cavity into the second cavity and disperse it by the nozzle to form multiple cooling droplets.

[0015] According to one aspect of the embodiment of the present application, the connecting pipe is configured as a condenser.

[0016] According to one aspect of the embodiment of the present application, it also includes an external heat exchanger, which is connected to the cooling component.

[0017] According to one aspect of an embodiment of the present application, the converter is arranged in a nacelle of the wind turbine generator set, and the external heat exchanger is arranged outside the nacelle and supported on the nacelle body of the nacelle; and / or, the tower of the wind turbine generator set encloses a hollow cavity, the converter is arranged in the hollow cavity and is located at one end of the tower away from the nacelle along a first direction, and the external heat exchanger is arranged outside the hollow cavity.

[0018] On the other hand, according to an embodiment of the present application, a converter is provided, which includes the cooling system of the above embodiment and a first electronic device and a second electronic device disposed in the cooling system; the first electronic device exchanges heat with the cooling medium in the first cavity, and the second electronic device is disposed in the second cavity and located on the dripping path of the coolant droplets.

[0019] According to an aspect of an embodiment of the present application, the first electronic device is an IGBT module, and the second electronic device is at least one of a circuit breaker, a reactor, a capacitor, a connection bar, and a fuse.

[0020] According to an aspect of an embodiment of the present application, the first electronic device includes a heat generating part and a heat conducting part disposed on the heat generating part, and the contact area between the heat conducting part and the cooling medium in the first cavity is larger than the contact area between the heat generating part and the heat conducting part.

[0021] The cooling system and the converter for a wind turbine generator provided by the embodiments of the present application, the cooling system includes a housing and a cooling component, the housing has a first cavity and a second cavity, the first cavity is filled with a cooling medium, after the cooling medium exchanges evaporation heat with the converter, it flows back to the first cavity under the action of the cooling component and forms an evaporation-condensation cycle. To reduce the corrosion of the cooling medium after long-term operation, the cooling system further includes a flow disturbing component, the flow disturbing component is connected to the first cavity of the housing and is configured to guide the cooling medium to flow in the first cavity, so that the cooling medium in the first cavity is in an active state. Compared with the situation where the cooling medium is static, on the one hand, it can reduce the corrosion of the cooling medium on the internal structure of the cooling system, and on the other hand, since the heat transfer capacity of heat convection is greater than that of heat conduction and radiation, it can also improve the heat exchange efficiency of the cooling system and improve the cooling effect of the converter. Description of the Drawings

[0022] Hereinafter, the features, advantages, and technical effects of the exemplary embodiments of the present application will be described with reference to the drawings.

[0023] Figure 1 is a schematic structural diagram of a converter according to an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of the flow disturbing component of the cooling system according to an embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of a converter according to another embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of a first electronic device according to an embodiment of the present application;

[0027] Figure 5 is a schematic structural diagram of a first electronic device according to another embodiment of the present application;

[0028] Figure 6 It is a schematic structural diagram of a converter according to another embodiment of the present application;

[0029] Figure 7 It is a schematic structural diagram of a converter according to another embodiment of the present application;

[0030] Figure 8 It is a schematic structural diagram of a wind turbine according to an embodiment of the present application;

[0031] Figure 9 It is a schematic structural diagram of a wind turbine according to another embodiment of the present application.

[0032] In the drawings:

[0033] 10 - Cooling system; 20 - First electronic device; 210 - Heating part; 220 - Heat conduction part; 30 - Second electronic device; 40 - Cabin; 50 - Tower;

[0034] 1 - Housing; 11 - Inner housing; 12 - Outer housing; 2 - Turbulence component; 21 - First pump body; 211 - Pump station; 22 - Suction pipeline; 23 - Return pipeline; 3 - Cooling component; 31 - Nozzle; 32 - Connecting pipeline; 33 - Second pump body; 4 - Mounting bracket; 5 - Substrate; 6 - External heat exchanger;

[0035] S1 - First chamber; S2 - Second chamber; S3 - Third chamber;

[0036] X - Second direction; Z - First direction.

[0037] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. Detailed implementation manners

[0038] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only provided to better understand the present application by showing examples of the present application. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessarily obscuring the present application; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0039] The orientation terms used in the following description are all the directions shown in the figures, and do not limit the cooling system and the converter for a wind turbine generator set of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] An embodiment of the present application provides a converter, which includes a cooling system for the converter and a plurality of electronic devices disposed in the cooling system. The cooling system cools the plurality of electronic devices to ensure the performance of the high-power converter.

[0041] The evaporation cooling method currently adopted by the converter usually utilizes the heat exchange between the electronic device and the cooling medium in the cooling system. By evaporating the cooling medium into a gaseous state, the latent heat of vaporization is utilized to achieve the heat exchange of the electronic device.

[0042] In view of the usage environment requirements of the converter in the wind turbine generator set, antifreeze containing ethylene glycol is often added to the cooling medium. During long-term operation, ethylene glycol will continuously decompose, generating acidic substances, etc., causing corrosion or blockage of the cooling system and seriously affecting the heat exchange capacity. Therefore, in order to overcome the above defects, an embodiment of the present application also provides a new cooling system. This cooling system can be used for converters of various models, especially for the converters of wind turbine generator sets, and can be integrated with the converter to form a whole, or can be produced or sold as an independent component.

[0043] Please refer to Figures 1 to 2 , the cooling system 10 provided by the embodiment of the present application includes a housing 1, a flow disturbance component 2, and a cooling component 3. The housing 1 has a receiving cavity, and the receiving cavity includes a first cavity S1 and a second cavity S2 that are connected in a first direction Z. The first cavity S1 is configured to be able to accommodate a liquid cooling medium. The flow disturbance component 2 is connected to the first cavity S1 of the housing 1. The flow disturbance component 2 is used to guide the cooling medium to flow in the first cavity S1 and exchange heat with the converter. The cooling component 3 is connected to the second cavity S2 of the housing 1. The cooling component 3 is used to convert part of the cooling medium into coolant droplets and return them to the first cavity S1.

[0044] The cooling system 10 of the embodiment of the present application includes a housing 1 and a cooling component 3. The housing 1 has a first cavity S1 and a second cavity S2. A cooling medium is accommodated in the first cavity S1. After the cooling medium exchanges heat by evaporation with the converter, under the action of the cooling component 3, it returns from the second cavity S2 to the first cavity S1 and forms an evaporation-condensation cycle.

[0045] To reduce the corrosion of the cooling medium after long-term operation, the cooling system 10 further includes a flow disturbance component 2. The flow disturbance component 2 is connected to the first chamber S1 of the housing 1 and is configured to guide the cooling medium to flow in the first chamber S1, so that the cooling medium in the first chamber S1 is in an active state. Compared with the case where the cooling medium is static, on the one hand, it can reduce the corrosion of the internal structure of the cooling system 10 by the cooling medium, extend the service life of the components in the cooling system 10, and reduce the influence of the cooling medium on the heat exchange capacity of the cooling system 10. On the other hand, since the heat transfer capacity of heat convection is greater than that of heat conduction and radiation, by guiding the cooling medium in the first chamber S1 to flow relative to the converter through the flow disturbance component 2, the heat exchange efficiency of the cooling system 10 can also be improved, thereby further improving the cooling effect of the converter.

[0046] It can be understood that since the cooling component 3 will convert part of the cooling medium into coolant droplets and drip from the second chamber S2, there is cooling medium in both the first chamber S1 and the second chamber S2. Therefore, in some alternative embodiments, multiple electronic devices of the converter can be divided into a first electronic device 20 and a second electronic device 30. The first electronic device 20 exchanges heat with the liquid cooling medium in the first chamber S1, and the second electronic device 30 is disposed in the second chamber and on the dripping path of the coolant droplets, so as to realize the heat exchange of multiple electronic devices of the converter and ensure the cooling effect of the converter.

[0047] Among them, the multiple electronic devices of the converter of the wind turbine mainly include a circuit breaker, a reactor, an IGBT module, a capacitor, etc. The multiple electronic devices are connected to form a power loop to convert the electrical energy with non-standard frequency and non-standard voltage generated by the generator of the wind turbine into electrical energy with the frequency and voltage required by the power grid.

[0048] Among the multiple electronic devices, the IGBT module is the core device of the converter. During its operation, it will frequently turn on and off, generating a large amount of heat loss and a large heat flux density. It is the main source of the power loss of the converter. Moreover, the IGBT module itself has a requirement for the junction temperature. The junction temperature affects the service life of the device or even directly damages it, thus reducing the safety and reliability of the equipment. Therefore, the cooling of the IGBT module is very crucial and directly determines the operation stability and reliability of the converter.

[0049] Therefore, in some alternative embodiments, the first electronic device 20 is an IGBT module, and the second electronic device 30 is other power electronic devices different from the IGBT module, such as at least one of a circuit breaker, a reactor, a capacitor, a connection bar, and a fuse. Thus, the electronic devices can be arranged according to the cooling requirements of each electronic device in the converter to improve the cooling effect of the converter.

[0050] The following takes the example that multiple electronic devices of the converter are separately arranged in the first electronic device 20 and the second electronic device 30 and respectively exchange heat with the cooling medium in the first chamber S1 and the second chamber S2 to illustrate the specific structures of the components in the cooling system 10.

[0051] Regarding the housing 1 of the cooling system 10, it includes a first chamber S1 and a second chamber S2 that are connected and communicated along the first direction Z. Considering the effect of gravity, the first direction Z can be set as the vertical direction. The first chamber S1 is arranged below the housing 1 along the vertical direction, and the second chamber S2 is arranged above the housing 1 along the vertical direction, so as to facilitate the evaporation-condensation cycle of the cooling medium in the housing 1 between the first chamber S1 and the second chamber S2.

[0052] As an example, it can be that the lower part area of the housing 1 forms the first chamber S1, and the upper part area of the housing 1 forms the second chamber S2. It can also be that the housing 1 includes a first sub-housing and a second sub-housing with a certain height difference. The first sub-housing forms the first chamber S1, the second sub-housing forms the second chamber S2, and the first sub-housing and the second sub-housing are connected and communicated through a pipeline. Among them, the specific setting method of the housing 1 can be adjusted according to the converter structure, as long as the accommodation chamber can be divided into the connected first chamber S1 and second chamber S2.

[0053] Please refer to Figure 1 and Figure 2 , since the cooling medium in the housing 1 will perform an evaporation cooling cycle between the first chamber S1 and the second chamber S2, in some alternative embodiments, the housing 1 includes an inner housing 11 and an outer housing 12 sleeved on the inner housing 11. The inner housing 11 forms the accommodation chamber, and the space between the outer housing 12 and the inner housing 11 is configured to be able to form a low-pressure chamber, and the pressure in the low-pressure chamber is less than the pressure in the accommodation chamber.

[0054] By setting the nested inner housing 11 and outer housing 12, a low-pressure chamber can be formed between the inner housing 11 and the outer housing 12, so that the evaporation cooling medium leaked from the accommodation chamber can be collected through the low-pressure chamber and then conveyed back to the cooling system 10 again to avoid the loss of the cooling medium.

[0055] To ensure the collection effect of the low-pressure chamber, the pressure in the low-pressure chamber is also less than the external environmental pressure. Therefore, the evaporation cooling medium leaked from the accommodation chamber and the air overflowing from the external environment are collected in the low-pressure chamber at the same time. Thus, the cooling system 10 may further include a gas separator for recovering the evaporation cooling medium in the low-pressure chamber to only convey the evaporation cooling medium back to the cooling system 10 again, thereby realizing the recycling of the cooling medium and reducing costs.

[0056] Regarding the flow disturbing component 2 in the cooling system 10, which needs to guide the relative flow of the cooling medium in the first chamber S1, the flow disturbing component 2 can be set in at least the following two forms:

[0057] In the first form, the spoiler assembly 2 includes a rotating shaft and helical fins (not shown in the figure) mounted on the rotating shaft. The rotating shaft is disposed in the first chamber S1 and can rotate about a rotation axis along the first direction Z. That is, the spoiler assembly 2 can be configured as a helical fin structure to stir the cooling medium in the first chamber S1 through the helical fins, so that the cooling medium in the first chamber S1 becomes turbulent and is in an active state.

[0058] Please refer to Figure 1 and Figure 2 , in the second form, the spoiler assembly 2 includes a first pump body 21, a suction pipe 22 and a return pipe 23. The suction pipe 22 and the return pipe 23 are respectively connected to the first chamber S1 of the housing 1. The first pump body 21 is disposed between the suction pipe 22 and the return pipe 23 and is used to drive the cooling medium to circulate in a loop formed by the first chamber S1, the suction pipe 22 and the return pipe 23. That is, the spoiler assembly 2 can also be configured as the first pump body 21, the suction pipe 22 and the return pipe 23 externally connected to the housing 1. The first pump body 21 sucks the cooling medium in the first chamber S1 to promote the cooling medium in the first chamber S1 to convect relative to the housing 1 and make it in an active state.

[0059] Optionally, the suction pipe 22 and the return pipe 23 can be respectively connected to both sides of the first chamber S1 along the second direction X, and the second direction X intersects with the first direction Z, so that the cooling medium can flow unidirectionally in the first chamber S1 to improve the convection efficiency.

[0060] Since the cooling medium in the first chamber S1 will reach the boiling point after heat exchange with the first electronic device 20, in order to avoid the occurrence of cavitation of the first pump body 21 when the first pump body 21 pushes the cooling medium and the cooling medium undergoes a phase change, in some optional embodiments, the first pump body 21 is located on the side of the first chamber S1 away from the second chamber S2 and is spaced from the first chamber S1 in the first direction Z.

[0061] That is, the first pump body 21 is disposed below the housing 1 and placed at a sufficiently low position to use gravity to increase the pressure of the cooling medium flowing to the first pump body 21, so that the boiling point of the cooling medium at the first pump body 21 is increased to reduce the cavitation risk and extend the service life of the cooling system 10.

[0062] Furthermore, the diameter of the suction pipe 22 is larger than the diameter of the return pipe 23.

[0063] On the basis of placing the first pump body 21 at a sufficiently low position, the diameter of the suction pipe 22 can be increased to reduce the pressure loss during the process of the cooling medium in the first chamber S1 entering the first pump body 21, so that the pressure at the first pump body 21 can be substantially equal to the static pressure of the cooling medium, thereby reducing the risk of cavitation. In addition, the diameter of the return pipe 23 can be reduced to facilitate the return of the cooling medium to the first chamber S1, thereby improving the reliability of the operation of the spoiler assembly 2.

[0064] In some optional embodiments, the first pump body 21 includes more than two pump stations 211, which are arranged at intervals between the suction pipe 22 and the return pipe 23 and are used to pressurize the cooling medium in the loop. In addition to placing the first pump body 21 at a sufficiently low position, the number of pump stations 211 can be increased, for example, more than two pump stations 211 are arranged to ensure the pressure of the cooling medium in the loop, so as to further reduce the risk of cavitation.

[0065] As an example, when two pumping stations 211 are provided, the pumping station 211 close to the suction pipe 22 of the two pumping stations 211 can be defined as the first pumping station, and the pumping station 211 close to the return pipe 23 can be defined as the second pumping station. At this time, in order to ensure the pressure of the cooling medium in the loop, the distance between the first pumping station and the first cavity S1 can be greater than the distance between the second pumping station and the first cavity S1 in the first direction Z, that is, the second pumping station is located on the side of the first pumping station, so that in the process of the cooling medium flowing back from the first pumping station to the first cavity S1, the pressure of the cooling medium can be further increased by the second pumping station, so that it is more convenient to flow the cooling medium back to the first cavity S1, thereby improving the reliability of the operation of the spoiler assembly 2.

[0066] It is understandable that the number of pump stations 211 includes but is not limited to two, and the layout of the pump station 211 can also be adjusted according to the space in the wind turbine and the structure of the inverter, that is, it can ensure that the first pump body 21 does not cavitation during the convection of the cooling medium.

[0067] See also Figure 1 and Figure 2 In order to achieve heat exchange between the first electronic device 20 and the cooling medium in the first cavity S1, in some optional embodiments, the housing 1 further includes a substrate 5, which is disposed in the accommodating cavity and is separated on the side of the first cavity S1 away from the second cavity S2 to form a third cavity S3, and the third cavity S3 is used to accommodate the first electronic device 20. That is, the first electronic device 20 can be disposed in the third cavity S3 and attached to the substrate 5, and the heat of the first electronic device 20 is transferred to the cooling medium in the first cavity S1 through the substrate 5. The above-mentioned attachment method can reduce the influence of the flow of the cooling medium in the first cavity S1 on the first electronic device 20, and the reliability of the first electronic device 20 is higher.

[0068] Please refer to Figure 3 , in some alternative embodiments, the cooling system 10 further includes a mounting bracket 4 for mounting the inverter. The mounting bracket 4 is mounted in the first chamber S1 of the housing 1 and immersed in the cooling medium. That is, the first electronic device 20 can also be directly immersed in the cooling medium through the mounting bracket 4. In the above immersion method, the first electronic device 20 can directly transfer heat to the cooling medium, and the cooling effect is better.

[0069] Optionally, the mounting angle between the mounting bracket 4 and the housing 1 is fixed or adjustable. By adjusting the mounting angle of the mounting bracket 4, after the first electronic device 20 is mounted on the mounting bracket 4, the inclination angle of the contact surface between the first electronic device 20 and the cooling medium can be adjusted, so as to adjust the heat transfer coefficient between the first electronic device 20 and the cooling medium, thereby verifying the heat transfer capacity of the first electronic device 20 at different inclination angles to achieve a better heat transfer effect.

[0070] Please refer to Figure 4 and Figure 5 , when the first electronic device 20 is immersed in the cooling medium, in addition to adjusting the mounting angle of the mounting bracket 4, in some alternative embodiments, the first electronic device 20 includes a heating part 210 and a heat conducting part 220 provided on the heating part 210. The contact area between the heat conducting part 220 and the cooling medium in the first chamber S1 is larger than the contact area between the heating part 210 and the heat conducting part 220.

[0071] The surface of the first electronic device 20 can be modified into different surface forms, so as to form different forms of the heat conducting part 220, so as to increase the contact area between the first electronic device 20 and the cooling medium to achieve a better heat transfer effect.

[0072] Among them, the heat conducting part 220 can be set as a plurality of convex points protruding relative to the heating part 210. For example, the convex points can be set as at least one of a cone, a cylinder and a hemisphere. The cone includes but is not limited to a regular triangular pyramid and a regular quadrangular pyramid. The cylinder includes but is not limited to a cube and a cuboid. By verifying the heat transfer capacity of the heat conducting part 220 with different structures, the surface form of the first electronic device 20 can be adjusted to achieve a better heat transfer effect.

[0073] Regarding the cooling component 3 in the cooling system 10, it is required to convert the cooling medium into a plurality of coolant droplets and return them to the first chamber S1. The cooling component 3 can be set in at least the following two forms:

[0074] Please refer to Figures 1 to 5 , in some alternative embodiments, the cooling component 3 is set as a condenser. The condenser is arranged in the second chamber S2, and the condenser is configured to be able to condense the cooling medium evaporated into the second chamber S2 from a gaseous state to form a plurality of coolant droplets.

[0075] When the cooling component 3 is set as a condenser, the working principle of the cooling system 10 is as follows: The cooling medium in the first chamber S1 exchanges heat with the first electronic device 20, and part of the cooling medium reaches the boiling point temperature, is transformed into vaporized cooling medium and rises into the second chamber S2. When the vaporized cooling medium contacts the condenser, it condenses into multiple coolant droplets. Among them, the surfaces of the multiple coolant droplets serve as heat exchange contact surfaces. Part of the coolant droplets absorb the heat of the second electronic device 30 and the vaporized cooling medium and turn back into gas again, and another part of the coolant droplets flow back into the first chamber S1, thereby forming a cooling cycle to realize the cooling of the first electronic device 20 and the second electronic device 30 while realizing the recycling of the cooling medium and reducing costs.

[0076] It can be understood that an external heat exchanger 6 may also be included. The external heat exchanger 6 may be a component of the cooling system 10, or may be additionally provided to be connected to the cooling component 3 of the cooling system 10 after the cooling system 10 is set up. When the cooling component 3 is set as a condenser, by connecting the external heat exchanger 6 to the condenser, a coolant flow pipe is formed inside the condenser for allowing an external cooling liquid or cooling gas to flow through, thereby taking away the heat inside the housing 1.

[0077] Please refer to Figure 6 and Figure 7 , in some other alternative embodiments, the cooling component 3 includes a nozzle 31, a connecting pipe 32 and a second pump body 33. The nozzle 31 is arranged in the second chamber S2 of the housing 1. One end of the connecting pipe 32 is connected to the nozzle 31, and the other end is connected to the cooling medium in the first chamber S1 through the second pump body 33 to suck part of the cooling medium in the first chamber S1 to the nozzle 31 and disperse it to form multiple coolant droplets.

[0078] When the cooling component 3 is set as the nozzle 31, the connecting pipe 32 and the second pump body 33, the working principle of the cooling system 10 is as follows: Part of the cooling medium in the first chamber S1 exchanges heat with the first electronic device 20 and is transformed into vaporized cooling medium, and another part of the cooling medium is sucked by the second pump body 33 to the nozzle 31 located in the second chamber S2, and the cooling medium is dispersed by the nozzle 31 to form multiple coolant droplets. Among them, the surfaces of the multiple coolant droplets serve as heat exchange contact surfaces. Part of the coolant droplets absorb the heat of the second electronic device 30 and the vaporized cooling medium and turn back into gas again, and another part of the coolant droplets flow back into the first chamber S1, thereby forming a cooling cycle to realize the cooling of the first electronic device 20 and the second electronic device 30 while realizing the recycling of the cooling medium and reducing costs.

[0079] It should be noted that when the cooling component 3 includes a nozzle 31, a connecting pipe 32, and a second pump body 33, the first electronic device 20 also has two installation forms. It can be installed in the third cavity S3 and attached to the substrate 5, or it can be immersed in the cooling medium in the first cavity S1 through the mounting bracket 4. The above embodiments can be combined with each other without conflict.

[0080] It can be understood that since the cooling medium in the first cavity S1 exchanges heat with the first electronic device 20, it is necessary to cool the cooling medium in the connecting pipe 32 before a part of the cooling medium in the first cavity S1 is pumped to the nozzle 31.

[0081] In some alternative embodiments, the connecting pipe 32 is configured as a condenser tube. The condenser tube includes an outer tube and an inner tube. The inner tube is used to pass the cooling medium in the first cavity S1, and the outer tube is formed with a coolant flow pipe for allowing an external cooling liquid or cooling gas to flow through, thereby taking away the heat of the cooling medium in the first cavity S1.

[0082] Furthermore, the cooling system 10 further includes an external heat exchanger 6, and the external heat exchanger 6 is connected to the connecting pipe 32. Among them, according to the setting structure of the connecting pipe 32, the external heat exchanger 6 has the following two setting methods.

[0083] When the connecting pipe 32 is configured as a flexible hose, the external heat exchanger 6 can be directly arranged between the connecting pipes 32, and the cooling medium in the first cavity S1 flows through the external heat exchanger 6 to cool the cooling medium. When the connecting pipe 32 is configured as a condenser tube, the external heat exchanger 6 can be connected to the outer tube and inject a cooling liquid or cooling gas into the outer tube.

[0084] Please refer to Figure 8 and Figure 9 , in some alternative embodiments, the converter is arranged in the nacelle 40 of the wind turbine generator, the external heat exchanger 6 is arranged outside the nacelle 40 and supported on the nacelle body of the nacelle 40, and / or, the tower 50 of the wind turbine generator encloses a hollow cavity, the converter is arranged in the hollow cavity and is located at one end of the tower 50 away from the nacelle 40 along the first direction Z, and the external heat exchanger 6 is arranged outside the hollow cavity.

[0085] That is, the external heat exchanger 6 can be arranged outside the wind turbine generator to reduce the occupation of the internal space of the wind turbine generator while ensuring the heat exchange effect of the converter. According to different types of wind turbine generators, such as the E-TOP type wind turbine generator, the converter is arranged in the nacelle 40 of the wind turbine generator, so the external heat exchanger 6 can be supported on the nacelle body of the nacelle 40. For non-E-TOP type wind turbine generators, the converter is arranged at the bottom of the tower 50 of the wind turbine generator, so the external heat exchanger 6 can be arranged outside the tower 50 and supported on the foundation.

[0086] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cooling system (10) for a converter of a wind turbine generator, characterized in that, the cooling system (10) includes: a housing (1) having an accommodation cavity, the accommodation cavity including a first cavity (S1) and a second cavity (S2) communicating with each other along a first direction (Z), the first cavity (S1) being configured to accommodate a liquid cooling medium; a flow disturbing component (2) connected to the first cavity (S1) of the housing (1), the flow disturbing component (2) being used to guide the cooling medium to flow in the first cavity (S1) and perform heat exchange with the converter; a cooling component (3) connected to the second cavity (S2) of the housing (1), the cooling component (3) being used to convert part of the cooling medium into coolant droplets and return them to the first cavity (S1).

2. The cooling system (10) according to claim 1, characterized in that, the flow disturbing component (2) includes a first pump body (21), a suction pipeline (22) and a return pipeline (23), the suction pipeline (22) and the return pipeline (23) are respectively connected to the first cavity (S1) of the housing (1), the first pump body (21) is arranged between the suction pipeline (22) and the return pipeline (23) and is used to drive the cooling medium to circulate in a loop formed by the first cavity (S1), the suction pipeline (22) and the return pipeline (23).

3. The cooling system (10) according to claim 2, characterized in that, the first pump body (21) is located on a side of the first cavity (S1) away from the second cavity (S2) and is spaced from the first cavity (S1) in the first direction (Z).

4. The cooling system (10) according to claim 3, characterized in that, the diameter of the suction pipeline (22) is larger than the diameter of the return pipeline (23).

5. The cooling system (10) according to claim 2, characterized in that, the first pump body (21) includes two or more pump stations (211), the two or more pump stations (211) are spaced and arranged between the suction pipeline (22) and the return pipeline (23) and are used to pressurize the cooling medium in the loop.

6. The cooling system (10) according to claim 1, characterized in that, further includes: a mounting bracket (4) for mounting the converter, the mounting bracket (4) is mounted in the first cavity (S1) of the housing (1) and is configured to be able to be immersed in the cooling medium; and the mounting angle between the mounting bracket (4) and the housing (1) is fixed or adjustable.

7. The cooling system (10) according to claim 1, characterized in that, further includes a substrate (5), the substrate (5) is arranged in the accommodation cavity and separates and forms a third cavity (S3) on a side of the first cavity (S1) facing away from the second cavity (S2), the third cavity (S3) is used to accommodate the converter.

8. The cooling system (10) according to claim 1, characterized in that, The housing (1) includes an inner housing (11) and an outer housing (12) sleeved outside the inner housing (11). The inner housing (11) forms the accommodation cavity, and a low-pressure cavity is configured to be formed between the outer housing (12) and the inner housing (11), wherein the pressure of the low-pressure cavity is less than the pressure of the accommodation cavity.

9. The cooling system (10) according to claim 1, characterized in that the cooling component (3) is arranged as a condenser, the condenser is arranged in the second cavity (S2); and the condenser is configured to be able to condense the cooling medium evaporated into the second cavity (S2) from a gaseous state to form a plurality of the coolant droplets.

10. The cooling system (10) according to claim 1, characterized in that the cooling component (3) includes a nozzle (31), a connecting pipe (32) and a second pump body (33), the nozzle (31) is arranged in the second cavity (S2) of the housing (1), one end of the connecting pipe (32) is connected to the nozzle (31), and the other end is connected to the cooling medium in the first cavity (S1) through the second pump body (33) to suck part of the cooling medium in the first cavity (S1) into the second cavity (S2) and disperse it through the nozzle (31) to form a plurality of the coolant droplets.

11. The cooling system (10) according to claim 10, characterized in that the connecting pipe (32) is arranged as a condensing pipe.

12. The cooling system (10) according to any one of claims 1-11, characterized in that it further includes an external heat exchanger (6), and the external heat exchanger (6) is connected to the cooling component (3).

13. The cooling system (10) according to claim 12, characterized in that the converter is arranged in the nacelle (40) of the wind turbine generator set, the external heat exchanger (6) is arranged outside the nacelle (40) and supported on the nacelle body of the nacelle (40); and / or, a hollow cavity is formed by enclosing the tower (50) of the wind turbine generator set, the converter is arranged in the hollow cavity and is located at one end of the tower (50) away from the nacelle (40) along the first direction (Z), and the external heat exchanger (6) is arranged outside the hollow cavity.

14. A converter, characterized in that it includes the cooling system (10) according to any one of claims 1 to 13 and a first electronic device (20) and a second electronic device (30) arranged in the cooling system (10); the first electronic device (20) is configured to be able to perform heat exchange with the cooling medium in the first cavity (S1), and the second electronic device (30) is arranged in the second cavity (S2) and is located on the dripping path of the coolant droplets.

15. The converter according to claim 14, characterized in that the first electronic device (20) is an IGBT module, and the second electronic device (30) is at least one of a circuit breaker, a reactor, a capacitor, a connection row and a fuse.

16. The converter according to claim 14, characterized in that The first electronic device (20) is immersed in the first cavity (S1). The first electronic device (20) includes a heating part (210) and a heat conducting part (220) disposed on the heating part (210). The contact area of the heat conducting part (220) with the cooling medium in the first cavity (S1) is larger than the contact area of the heating part (210) with the heat conducting part (220).

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