Cooling device for stator of wind driven generator

Abstract

The invention belongs to the technical field of wind power generation, and discloses a wind driven generator stator cooling device which comprises a heat conduction structure and a condenser, a stator is arranged in a stator groove, the heat conduction structure comprises a first heat conduction pipe and a second heat conduction pipe, and the first heat conduction pipe and the second heat conduction pipe are arranged in parallel and both penetrate through the stator groove; the first heat-conducting pipe is arranged at the bottom of the stator groove, the second heat-conducting pipe is arranged at the top of the stator groove, and the stator is arranged between the first heat-conducting pipe and the second heat-conducting pipe. The condenser is located above the heat conduction structure in the vertical direction, the condenser and the heat conduction structure form a circulation loop, and refrigerants flow in the circulation loop. The wind driven generator stator cooling device can reduce local heat accumulation of the stator, optimize temperature distribution of the stator, improve heat dissipation uniformity of the cooling device, further prevent deformation or stress concentration of a stator iron core caused by overlarge temperature difference between different parts of the stator, and ensure structural strength and stability of a motor.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind power generator stator cooling device. Background Art

[0002] During the operation of a wind turbine, the stator winding is the main component that generates a lot of heat. Especially when running at high load, the increase in winding temperature may cause aging of the insulation material, affecting the reliability and long-term stability of the motor. Therefore, the design of the cooling system in a wind turbine is directly related to the working efficiency and service life of the generator.

[0003] During the operation of the stator, due to the different current distribution and cooling effect, traditional cooling solutions such as air cooling and water cooling cannot effectively cool the top of the stator teeth, and the temperature of the stator slot is too high compared to other parts of the stator core. The large temperature difference causes the stator core to deform or generate stress concentration, affecting the mechanical structure of the motor, resulting in reduced operating stability of the motor or even failure.

[0004] Therefore, there is an urgent need for a wind turbine stator cooling device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a wind turbine stator cooling device, which can optimize the temperature distribution of the stator slots, reduce local heat accumulation, and ensure the uniformity and stability of the cooling system.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A wind turbine stator cooling device is provided, wherein the stator is arranged in a stator slot, and comprises:

[0008] A heat-conducting structure, the heat-conducting structure comprising a first heat-conducting pipe and a second heat-conducting pipe, the first heat-conducting pipe and the second heat-conducting pipe are arranged in parallel and both penetrate the stator slot, the first heat-conducting pipe is arranged at the bottom of the stator slot, the second heat-conducting pipe is arranged at the top of the stator slot, and the stator is arranged between the first heat-conducting pipe and the second heat-conducting pipe;

[0009] A condenser is located above the heat-conducting structure in a vertical direction. The condenser and the heat-conducting structure form a circulation loop in which a refrigerant flows.

[0010] As an optional solution for the wind turbine stator cooling device, the heat-conducting structure is arranged obliquely in the vertical direction, and the inlet end of the heat-conducting structure is located below the outlet end.

[0011] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes a liquid storage tank, and the liquid storage tank is connected between the output end of the condenser and the heat conduction structure.

[0012] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes a liquid return pipe, and the liquid return pipe is connected between the liquid storage tank and the heat conduction structure.

[0013] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes a first three-way joint, and three passages of the first three-way joint are respectively connected to the liquid return pipe, the first heat conduction pipe and the second heat conduction pipe.

[0014] As an optional solution for the wind turbine stator cooling device, the first three-way joint is configured as a Teflon three-way drainage tube.

[0015] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes an air collecting pipe, and the air collecting pipe is connected between the outlet end of the heat conducting structure and the condenser.

[0016] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes a second three-way joint, and three passages of the second three-way joint are respectively connected to the air collecting pipe, the first heat conducting pipe and the second heat conducting pipe.

[0017] As an optional solution for the wind turbine stator cooling device, the second three-way joint is configured as a Teflon three-way drainage pipe.

[0018] As an optional solution of the wind turbine stator cooling device, the wind turbine stator cooling device further includes a heat recovery structure, and the heat recovery structure is connected to the condenser.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a wind turbine stator cooling device, wherein a first heat conducting pipe and a second heat conducting pipe are respectively arranged at the bottom and the top of a stator slot, and the stator is arranged between the first heat conducting pipe and the second heat conducting pipe, so that both ends of the stator can dissipate heat to the heat conducting structure at the same time, and refrigerants in the first heat conducting pipe and the second heat conducting pipe absorb heat and flow toward a condenser, and then flow back to the heat conducting structure after releasing heat in the condenser, so as to complete the cyclic heat dissipation of different parts of the stator, reduce the local heat accumulation of the stator, optimize the temperature distribution of the stator, improve the uniformity of the cooling device, and thus prevent the deformation of the stator core or the stress concentration caused by excessive temperature difference between different parts of the stator, thereby ensuring the structural strength and stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a wind turbine stator cooling device provided by the present invention;

[0022] Figure 2 It is a partial schematic diagram of the wind turbine stator cooling device provided by the present invention;

[0023] Figure 3 It is a cross-sectional view of the stator structure and the heat conducting structure.

[0024] In the figure:

[0025] 100. stator structure; 110. stator; 120. stator slot;

[0026] 200, heat conduction structure; 210, first heat conduction pipe; 220, second heat conduction pipe;

[0027] 300, condenser; 400, liquid storage tank; 500, liquid return pipe; 600, first three-way joint; 700, gas collecting pipe; 800, second three-way joint. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] like Figures 1 to 3 As shown, the wind turbine stator cooling device of this embodiment includes a heat-conducting structure 200 and a condenser 300. The stator structure 100 includes a stator 110 and a stator slot 120. The stator 110 is arranged in the stator slot 120. The heat-conducting structure 200 includes a first heat-conducting pipe 210 and a second heat-conducting pipe 220. The first heat-conducting pipe 210 and the second heat-conducting pipe 220 are arranged in parallel and both pass through the stator slot 120. The first heat-conducting pipe 210 is arranged at the bottom of the stator slot 120, the second heat-conducting pipe 220 is arranged at the top of the stator slot 120, and the stator 110 is arranged between the first heat-conducting pipe 210 and the second heat-conducting pipe 220. Preferably, the first heat pipe 210 and the second heat pipe 220 are made of high thermal conductivity materials, and the first heat pipe 210 and the second heat pipe 220 are attached to the inner wall of the stator slot 120, and the stator 110 is attached to the first heat pipe 210 and the second heat pipe 220, so as to ensure the heat transfer efficiency. The condenser 300 is located above the heat-conducting structure 200 in the vertical direction, and the condenser 300 and the heat-conducting structure 200 form a circulation loop, and the refrigerant flows in the circulation loop.

[0033] Based on the above design, in the wind turbine stator cooling device, the first heat pipe 210 and the second heat pipe 220 are respectively arranged at the bottom and the top of the stator slot 120, and the stator is arranged between the first heat pipe 210 and the second heat pipe 220, so that both ends of the stator can dissipate heat to the heat conducting structure 200 at the same time. The refrigerant in the first heat pipe 210 and the second heat pipe 220 absorbs heat and flows toward the condenser 300, and then flows back to the heat conducting structure 200 after releasing heat in the condenser 300, so as to complete the cyclic heat dissipation of different parts of the stator 110, reduce the local heat accumulation of the stator 110, optimize the temperature distribution of the stator 110, and improve the uniformity of the heat dissipation of the cooling device, thereby preventing the temperature difference between different parts of the stator 110 from being too large, causing the stator core to deform or generate stress concentration, and ensuring the structural strength and stability of the motor. Compared with air-cooling devices, the wind turbine stator cooling device reduces the stator core vibration problem caused by uneven airflow or excessive wind speed, helps to protect the fixity of the core, and reduces the looseness between the core layers, thereby improving the performance and efficiency of the generator.

[0034] It can be understood that the second heat pipe 220 is arranged on the top of the stator slot 120, which can effectively form a cooling barrier and significantly inhibit the transfer of heat generated by the stator to the rotor side, thereby optimizing the thermal management performance of the entire generator system, further optimizing the heat transfer path, and improving the cooling effect.

[0035] It should be noted that wind turbines are usually installed at high altitudes or at sea. These environmental conditions make their regular maintenance work extremely difficult, especially in severe climatic conditions and far from land. Therefore, it is necessary to ensure the long-term operation stability and good maintainability of the wind turbine cooling system. The wind turbine stator cooling device proposed in this embodiment utilizes the phase change characteristics of the refrigerant. When the refrigerant absorbs the heat transferred by the stator 110 in the heat-conducting structure 200, it evaporates to form gas and enters the condenser 300. In the absence of external energy supply, heat is transferred through natural circulation, reducing the use of components in the cooling device, thereby reducing the dependence on complex external power supply and maintenance operations. It can not only effectively improve the efficiency of cooling and heat dissipation, but also greatly reduce the production and subsequent maintenance costs, improve the sustainability of the cooling device, and help reduce the probability of failure in long-term use, ensuring the stability and reliability of the wind turbine.

[0036] In this embodiment, the first heat pipe 210 and the second heat pipe 220 can be replaced with pipes of different shapes, specifications and materials according to specific application requirements. For example, the cross-sectional shape of the first heat pipe 210 and the second heat pipe 220 can be circular, oval, square or other shapes that meet the heat dissipation requirements; their specifications can be adjusted or changed in size according to the heat conduction requirements and the installation space of the equipment to adapt to different technical requirements. In addition, the materials of the first heat pipe 210 and the second heat pipe 220 can also be selected from different metal materials, alloy materials, ceramic materials or composite materials according to factors such as the use environment, temperature range, thermal conductivity and corrosion resistance, so as to improve the overall thermal conductivity efficiency and system stability.

[0037] Optionally, the heat-conducting structure 200 is tilted in the vertical direction, and the inlet end of the heat-conducting structure 200 is located below the outlet end, so that the refrigerant can be gathered at the inlet end after entering the heat-conducting structure 200 and gradually flow to the outlet end, thereby extending the residence time of the refrigerant in the first heat-conducting pipe 210 and the second heat-conducting pipe 220, so that the refrigerant can fully absorb the heat of the stator and ensure the heat absorption efficiency, and reserve a flow channel for the evaporation and gasification of the refrigerant at the outlet end of the heat-conducting structure 200, thereby ensuring the smooth outflow of the refrigerant gas and avoiding the refrigerant gas from being liquefied after being retained at the top of the first heat-conducting pipe 210 and the second heat-conducting pipe 220, thereby ensuring the heat dissipation efficiency of the refrigerant.

[0038] Furthermore, the wind turbine stator cooling device also includes an air collecting pipe 700, which is connected between the outlet end of the heat-conducting structure 200 and the condenser 300. After the refrigerant gas flows out of the heat-conducting structure 200, it flows to the condenser 300 through the air collecting pipe 700, so that the refrigerant gas can flow evenly to the condenser 300, which is beneficial to ensure the stable operation of the condenser 300.

[0039] Furthermore, the wind turbine stator cooling device also includes a second three-way joint 800, and the three passages of the second three-way joint 800 are respectively connected to the gas collecting pipe 700, the first heat conducting pipe 210 and the second heat conducting pipe 220, ensuring that the refrigerant gas flows evenly from the first heat conducting pipe 210 and the second heat conducting pipe 220 into the gas collecting pipe 700.

[0040] Optionally, the second three-way connector 800 is configured as a Teflon three-way drainage tube. The drainage tube is made of Teflon material, has excellent high-temperature stability, and can work continuously and reliably in extreme temperature environments. In addition, Teflon has good aging resistance and can maintain its physical and chemical properties without significant changes during long-term use, thereby adapting to application requirements of long-term exposure to harsh working environments. In addition, the Teflon drainage tube also has a certain plasticity, which enables it to effectively accommodate certain matching errors when connecting the hollow heat conduction pipe with the return pipe and the gas collecting pipe, further improving the applicability and installation convenience of the system. Preferably, the outside of the Teflon three-way drainage tube is covered with a stainless steel braided mesh, which enhances its pressure resistance and ensures stable operation under high pressure conditions.

[0041] Furthermore, the wind turbine stator cooling device further includes a liquid storage tank 400, which is connected between the output end of the condenser 300 and the heat-conducting structure 200. The liquid storage tank 400 is used to store the liquid refrigerant flowing out of the condenser 300, ensuring that the refrigerant gas can continuously enter the condenser 300, so that the condenser 300 can work uninterruptedly and ensure the heat dissipation efficiency.

[0042] Furthermore, the wind turbine stator cooling device also includes a liquid return pipe 500, which is connected between the liquid storage tank 400 and the heat conduction structure 200, so that the refrigerant can fully flow into the first heat conduction pipe 210 and the second heat conduction pipe 220 to ensure uniform heat dissipation of the stator.

[0043] Furthermore, the wind turbine stator cooling device further comprises a first three-way joint 600, and the three passages of the first three-way joint 600 are respectively connected to the liquid return pipe 500, the first heat conducting pipe 210 and the second heat conducting pipe 220. Optionally, the first three-way joint 600 is configured as a Teflon three-way drainage pipe. The first three-way joint 600 can be configured with reference to the second three-way joint 800, and will not be described in detail here.

[0044] Furthermore, the wind turbine stator cooling device further includes a heat recovery structure, which is connected to the condenser 300. The heat absorbed by the refrigerant during the stator cooling process can be converted into usable thermal energy through the heat recovery structure. For example, the thermal energy can be used to heat other components of the wind turbine or to assist the heating system, thereby improving the energy utilization rate of the overall system, reducing energy waste, and improving the comprehensive economic benefits of the wind turbine.

[0045] 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, other different forms of changes or modifications can be made based on the above description. 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. A wind turbine stator cooling device, wherein the stator (110) is arranged in a stator slot (120), characterized in that: include: A heat-conducting structure (200), the heat-conducting structure (200) comprising a first heat-conducting pipe (210) and a second heat-conducting pipe (220), the first heat-conducting pipe (210) and the second heat-conducting pipe (220) being arranged in parallel and both passing through the stator slot (120), the first heat-conducting pipe (210) being arranged at the bottom of the stator slot (120), the second heat-conducting pipe (220) being arranged at the top of the stator slot (120), and the stator (110) being arranged between the first heat-conducting pipe (210) and the second heat-conducting pipe (220); A condenser (300), the condenser (300) is located above the heat-conducting structure (200) in the vertical direction, and the condenser (300) and the heat-conducting structure (200) form a circulation loop, in which a refrigerant flows.

2. The wind turbine stator cooling device according to claim 1, characterized in that: The heat-conducting structure (200) is arranged obliquely in the vertical direction, and the inlet end of the heat-conducting structure (200) is located below the outlet end.

3. The wind turbine stator cooling device according to claim 1, characterized in that: The wind turbine stator cooling device further comprises a liquid storage tank (400), wherein the liquid storage tank (400) is connected between the output end of the condenser (300) and the heat-conducting structure (200).

4. The wind turbine stator cooling device according to claim 3, characterized in that: The wind turbine stator cooling device further comprises a liquid return pipe (500), wherein the liquid return pipe (500) is connected between the liquid storage tank (400) and the heat conduction structure (200).

5. The wind turbine stator cooling device according to claim 4, characterized in that: The wind turbine stator cooling device further comprises a first three-way joint (600), wherein three passages of the first three-way joint (600) are respectively connected to the liquid return pipe (500), the first heat conduction pipe (210) and the second heat conduction pipe (220).

6. The wind turbine stator cooling device according to claim 5, characterized in that: The first three-way connector (600) is configured as a Teflon three-way drainage tube.

7. The wind turbine stator cooling device according to claim 1, characterized in that: The wind turbine stator cooling device further comprises an air collecting pipe (700), wherein the air collecting pipe (700) is connected between the outlet end of the heat conducting structure (200) and the condenser (300).

8. The wind turbine stator cooling device according to claim 7, characterized in that: The wind turbine stator cooling device further comprises a second three-way joint (800), wherein three passages of the second three-way joint (800) are respectively connected to the gas collecting pipe (700), the first heat conducting pipe (210) and the second heat conducting pipe (220).

9. The wind turbine stator cooling device according to claim 8, characterized in that: The second three-way connector (800) is configured as a Teflon three-way drainage tube.

10. The wind turbine stator cooling device according to claim 1, characterized in that: The wind turbine stator cooling device further comprises a heat recovery structure, and the heat recovery structure is connected to the condenser (300).

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