Evaporative cooling type wind driven generator stator cooling device

Abstract

The invention belongs to the technical field of wind driven generator stator cooling systems, and discloses an evaporative cooling type wind driven generator stator cooling device. The evaporative cooling type wind driven generator stator cooling device comprises a stator assembly, a heat conduction assembly and a condenser. The stator assembly comprises a stator iron core and a stator groove, and the stator iron core is obliquely arranged and located in the stator groove. The heat conduction assembly obliquely penetrates through the stator groove and makes contact with the stator iron core for heat conduction, and the inclination angle of the heat conduction assembly is the same as that of the stator iron core. The heat conduction assembly can be divided into a plurality of heat conduction modules, and the plurality of heat conduction modules respectively correspond to the stator iron cores at different positions. The condenser and each heat conduction module can form a cooling circulation loop, a cooling medium flows in the cooling circulation loop, and the multiple cooling circulation loops are mutually independent. The evaporative cooling type wind driven generator stator cooling device is good in cooling effect.

Description

Technical Field

[0001] The invention relates to the technical field of wind generator stator cooling systems, and in particular to an evaporative cooling type wind generator stator cooling device. Background Art

[0002] The stator cooling system of a wind turbine generator is a key part to ensure efficient and stable operation of the generator. It is mainly used to control the stator temperature and prevent overheating damage. It can be divided into air cooling, liquid cooling and evaporative cooling according to the cooling method. Among them, evaporative cooling has significant advantages over air cooling and liquid cooling and is widely used. The evaporative cooling wind turbine stator cooling system is an efficient cooling technology that uses the phase change of the cooling medium (liquid to gas) to absorb heat, thereby effectively reducing the stator temperature and ensuring the stable operation of the generator at high power density. At present, the evaporative cooling wind turbine stator cooling system is usually tilted at the same angle as the wind turbine, so that the cooling medium in the system can achieve self-circulation. However, it is also because of this that it is easy to cause uneven distribution of the cooling medium in the circulation loop, which ultimately leads to poor temperature uniformity of the stator.

[0003] Therefore, there is an urgent need to propose an evaporative cooling wind turbine stator cooling device to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an evaporative cooling type wind generator stator cooling device, which has a good cooling effect.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An evaporative cooling type wind turbine stator cooling device comprises:

[0007] A stator assembly, the stator assembly comprising a stator core and a stator slot, the stator core being arranged obliquely, and the stator core being located in the stator slot;

[0008] A heat-conducting component, the heat-conducting component obliquely penetrates the stator slot and contacts the stator core for heat conduction, the inclination angle of the heat-conducting component is the same as the inclination angle of the stator core, the heat-conducting component can be divided into a plurality of heat-conducting modules, and the plurality of heat-conducting modules respectively correspond to different positions of the stator core;

[0009] The condenser and each of the heat transfer modules can form a cooling circulation loop, in which a cooling medium flows, and the multiple cooling circulation loops are independent of each other.

[0010] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, the number of the condensers is the same as the number of the heat transfer modules, and a single condenser is used in each cooling cycle.

[0011] As an optional technical solution for an evaporative cooling wind turbine stator cooling device, the number of the heat conduction modules is N times the number of the condensers, and N heat conduction modules share one condenser, where N≥2.

[0012] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, the number of the heat conduction modules is eight.

[0013] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, the number of the condensers is four, and every two heat conduction modules share one condenser.

[0014] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, each of the cooling circulation loops further includes a gear pump, and the heat conduction module, the condenser and the gear pump are connected in sequence.

[0015] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, each group of the cooling circulation loops further includes a liquid storage tank, and the liquid storage tank is located between the condenser and the gear pump.

[0016] As an optional technical solution of the evaporative cooling wind turbine stator cooling device, each of the cooling circulation loops further includes a liquid return pipe, and the liquid return pipe is located between the heat conduction module and the gear pump.

[0017] As an optional technical solution for the evaporative cooling wind turbine stator cooling device, each of the cooling circulation loops further includes an air collecting pipe, and the air collecting pipe is located between the condenser and the heat conduction module.

[0018] As an optional technical solution for the evaporative cooling type wind turbine stator cooling device, the collecting pipe is connected to the condenser and the heat conduction module respectively through a ventilation joint.

[0019] Beneficial effects of the present invention:

[0020] The evaporative cooling type wind turbine stator cooling device provided by the present invention includes a stator assembly, a heat conduction assembly and a condenser. The stator core in the stator assembly is arranged obliquely, and the stator core is located in the stator slot. The heat conduction assembly is obliquely arranged in the stator slot at the same angle as the stator core, and is in contact with the stator core for heat conduction. The heat conduction assembly can be divided into a plurality of heat conduction modules, and the plurality of groups of heat conduction modules correspond to the stator core at different positions, respectively, to conduct heat for the corresponding stator core. The condenser and each heat conduction module can form a cooling circulation loop, and the refrigerant flows in the cooling circulation loop. The gaseous refrigerant is condensed by the condenser and becomes a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant evaporates through the heat conduction module to absorb heat and take away the heat of the stator core to become a gaseous refrigerant and return to the condenser, and the stator assembly is cooled in a cycle. The multiple cooling circulation loops are independent of each other, and each cooling circulation loop is responsible for the cooling demand of the stator core at the corresponding position, which can avoid the problem of uneven distribution of the circulating loop refrigerant caused by the tilted setting of the stator core, and ultimately improve the cooling effect of the evaporative cooling wind turbine stator cooling device on the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a top view of an evaporative cooling type wind turbine stator cooling device provided by an embodiment of the present invention;

[0022] Figure 2 It is one of the cooling circulation loops in the evaporative cooling wind generator stator cooling device provided in the embodiment of the present invention.

[0023] In the figure:

[0024] 110, stator core; 210, heat conduction module; 300, condenser; 301, first condenser; 302, second condenser; 303, third condenser; 304, fourth condenser; 400, gear pump; 500, liquid storage tank; 600, liquid return pipe; 700, gas collecting pipe. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] This embodiment provides an evaporative cooling type wind turbine stator cooling device, which has a good cooling effect.

[0030] Specifically, Figure 1 and Figure 2 As shown, the evaporative cooling type wind turbine stator cooling device includes a stator assembly, a heat conduction assembly and a condenser 300. The stator assembly includes a stator core 110 and a stator slot, the stator core 110 is tilted, and the stator core 110 is located in the stator slot. The heat conduction assembly is tilted and penetrates the stator slot, and contacts the stator core 110 for heat conduction, and the inclination angle of the heat conduction assembly is the same as the inclination angle of the stator core 110. The heat conduction assembly can be divided into a plurality of heat conduction modules 210. For example, the heat conduction modules 210 can be two, a group, four or seven, etc., and the plurality of heat conduction modules 210 correspond to the stator core 110 at different positions. The condenser 300 and each heat conduction module 210 can form a cooling circulation loop, in which the cooling medium flows, and the plurality of cooling circulation loops are independent of each other.

[0031] Based on the above design, the stator core 110 in the stator assembly is tilted, and the stator core 110 is located in the stator slot. The heat-conducting component is tilted and penetrated in the stator slot at the same angle as the stator core 110, and contacts and conducts heat with the stator core 110. The heat-conducting component can be divided into a plurality of heat-conducting modules 210, and the plurality of heat-conducting modules 210 correspond to the stator core 110 at different positions, respectively, and conduct heat for the corresponding stator core 110. The condenser 300 and each heat-conducting module 210 can form a cooling circulation loop, and the refrigerant flows in the cooling circulation loop. The gaseous refrigerant is condensed by the condenser 300 and becomes a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant evaporates through the heat-conducting module 210, absorbs heat, and takes away the heat of the stator core 110, and becomes a gaseous refrigerant and returns to the condenser 300, and the cooling of the stator assembly is realized by circulating in sequence. The multiple cooling circulation loops are independent of each other, and each cooling circulation loop is responsible for the cooling demand of the stator core 110 at the corresponding position, which can avoid the problem of uneven distribution of the circulating loop refrigerant due to the tilted setting of the stator core 110, and ultimately improve the cooling effect of the evaporative cooling wind turbine stator cooling device on the stator core 110.

[0032] It should be noted that the cooling medium needs to be selected to have a moderate boiling point, good insulation, high chemical stability and environmental protection. For example, the cooling medium can be deionized water, fluorinated liquid, silicone oil or nanofluid.

[0033] It should also be noted that the condenser 300 is located above the heat-conducting component, and the inclination of the heat-conducting component (each heat-conducting module 210 is inclined) means that it is equivalent to being inclined at a certain angle in the horizontal direction, usually 3 degrees to 5 degrees. Specifically, the inlet end of the heat-conducting module 210 is located below the outlet end, so that the cooling medium can be collected at the inlet end of the heat-conducting module 210 after entering the heat-conducting module 210, and gradually flow to the outlet end of the heat-conducting module 210, extending the time the cooling medium stays in the heat-conducting module 210, which can not only enable the cooling medium to fully absorb the heat of the stator core 110 and ensure the heat absorption efficiency, but also reserve a flow channel for the evaporation and gasification of the cooling medium at the outlet end of the heat-conducting module 210, ensure the smooth outflow of the gaseous cooling medium, avoid the gaseous cooling medium from being retained on the top of the heat-conducting module 210 and then liquefied, and ensure the heat dissipation efficiency of the cooling medium.

[0034] Optionally, the number of condensers 300 is the same as the number of heat transfer modules 210, and one condenser 300 is used alone in each cooling cycle, that is, one condenser 300 is responsible for one cooling cycle, which has high working efficiency.

[0035] Optionally, the number of heat transfer modules 210 is N times the number of condensers 300, and N heat transfer modules 210 share one condenser 300, N ≥ 2, that is, the cooling medium in N cooling circulation loops all enters and exits the same condenser 300, saving costs. Exemplarily, N is 2, 3, 4 or 5. Further, the number of heat transfer modules 210 is eight, and the number of condensers 300 can be four, two or one.

[0036] In this embodiment, the number of the heat transfer modules 210 is eight, and the number of the condensers 300 is four, that is, each condenser 300 corresponds to two cooling circulation loops.

[0037] Specific as Figure 1 As shown, the four condensers 300 are respectively a first condenser 301, a second condenser 302, a third condenser 303 and a fourth condenser 304. The first condenser 301, the second condenser 302, the third condenser 303 and the fourth condenser 304 are respectively responsible for Figure 1 Circulating cooling of the cooling medium in the two cooling circulation loops at the upper left, lower left, upper right and lower right in the middle.

[0038] Optionally, each cooling circulation loop also includes a gear pump 400, and the heat conduction module 210, the condenser 300 and the gear pump 400 are connected in sequence to improve the circulation effect of the cooling circulation loop; each cooling circulation loop is separately provided with a gear pump 400, and each cooling circulation loop can control the gear pump 400 in its own loop according to its own needs to control its own loop circulation.

[0039] Furthermore, each cooling circulation loop also includes a liquid storage tank 500, which is located between the condenser 300 and the gear pump 400. The liquid storage tank 500 is used to store the liquid cooling medium flowing out of the condenser 300 to ensure that the gaseous cooling medium can continuously enter the condenser 300, so that the condenser 300 can work uninterruptedly to ensure the heat dissipation efficiency.

[0040] Furthermore, each cooling circulation loop also includes a liquid return pipe 600, which is located between the heat conduction module 210 and the gear pump 400, so that the cooling medium can fully flow into the heat conduction module 210 to ensure uniform heat dissipation of the stator core 110 at the corresponding position.

[0041] Continue as Figure 2 As shown, each cooling cycle loop also includes an air collecting pipe 700, which is located between the condenser 300 and the heat conduction module 210. The gaseous cooling medium flows out of the heat conduction module 210 and enters the condenser 300 through the air collecting pipe 700, so that the gaseous cooling medium can flow evenly to the condenser 300, which is beneficial to ensure the working stability of the condenser 300.

[0042] Furthermore, the gas collecting pipe 700 is connected to the condenser 300 and the heat conducting module 210 respectively through the ventilation joint, so as to ensure that the gaseous cooling medium flows into and out of the gas collecting pipe 700 smoothly.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An evaporative cooling wind turbine stator cooling device, characterized in that: include: A stator assembly, the stator assembly comprising a stator core (110) and a stator slot, the stator core (110) being arranged obliquely, and the stator core (110) being located in the stator slot; a heat-conducting component, the heat-conducting component obliquely passes through the stator slot and contacts the stator core (110) for heat conduction, the inclination angle of the heat-conducting component being the same as the inclination angle of the stator core (110), the heat-conducting component being capable of being divided into a plurality of heat-conducting modules (210), the plurality of heat-conducting modules (210) respectively corresponding to portions of the stator core (110) at different positions; The condenser (300) and each of the heat transfer modules (210) can form a cooling circulation loop, in which a cooling medium flows, and the plurality of cooling circulation loops are independent of each other.

2. The evaporative cooling type wind turbine stator cooling device according to claim 1, characterized in that: The number of the condensers (300) is the same as the number of the heat transfer modules (210), and one condenser (300) is used alone in each cooling circulation loop.

3. The evaporative cooling type wind turbine stator cooling device according to claim 1, characterized in that: The number of the heat conduction modules (210) is N times the number of the condensers (300), and the N heat conduction modules (210) share one condenser (300), where N≥2.

4. The evaporative cooling type wind turbine stator cooling device according to claim 3, characterized in that: The number of the heat conduction modules (210) is eight.

5. The evaporative cooling type wind turbine stator cooling device according to claim 4, characterized in that: The number of the condensers (300) is four, and every two heat conduction modules (210) share one condenser (300).

6. The evaporative cooling type wind turbine stator cooling device according to claim 1, characterized in that: Each cooling circulation loop further comprises a gear pump (400), and the heat conduction module (210), the condenser (300) and the gear pump (400) are connected in sequence.

7. The evaporative cooling wind turbine stator cooling device according to claim 6, characterized in that: Each group of the cooling circulation loops further includes a liquid storage tank (500), and the liquid storage tank (500) is located between the condenser (300) and the gear pump (400).

8. The evaporative cooling wind turbine stator cooling device according to claim 6, characterized in that: Each of the cooling circulation loops further comprises a liquid return pipe (600), and the liquid return pipe (600) is located between the heat conduction module (210) and the gear pump (400).

9. The evaporative cooling type wind turbine stator cooling device according to claim 1, characterized in that: Each of the cooling circulation loops further comprises an air collecting pipe (700), wherein the air collecting pipe (700) is located between the condenser (300) and the heat transfer module (210).

10. The evaporative cooling wind turbine stator cooling device according to claim 9, characterized in that: The gas collecting pipe (700) is respectively connected to the condenser (300) and the heat conduction module (210) through a ventilation joint.

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