A separate liquid cooling structure installed on a carbon brush box

Abstract

The application discloses an independent liquid cooling structure installed on a carbon brush box, and particularly relates to the technical field of carbon brushes of wind power generation brush holders, and relates to a cooling cavity mechanism used for being attached and installed on the side surface of the carbon brush; and a circulating heat dissipation mechanism in sealed communication with the cooling cavity mechanism. The application adopts a closed phase change heat dissipation principle, relies on the process that the cooling liquid absorbs heat when being gasified in liquid phase and releases heat when being liquefied in gas phase to realize heat transfer, and the heat exchange efficiency is much higher than that of conventional air convection. The internal liquid storage cavity is vacuum sealed, the phase change boiling point of the cooling liquid can be reduced, the heat dissipation circulation can be started when the temperature rise amplitude of the carbon brush is small, the concentrated heat generated by the superposition of the friction heat and the Joule heat of the carbon brush can be quickly led out, and the continuous accumulation of heat in the local carbon brush is avoided.

Description

Technical Field

[0001] This invention relates to the field of carbon brush technology for wind power brush holders, and particularly to an independent liquid cooling structure mounted on a carbon brush box. Background Technology

[0002] In the operating system of wind power generation equipment, the slip ring and carbon brush assembly are the core components for realizing the transmission of electrical energy between rotating and stationary parts, and are also an indispensable key part of the excitation circuit of the wind turbine. When the unit is operating normally, the carbon brush end face and the slip ring surface always maintain a sliding contact state. The frictional heat generated by their relative motion, combined with the Joule heat generated by the large current flowing through the carbon brush body, will cause the carbon brush temperature to rise rapidly.

[0003] If this heat cannot be dissipated in a timely and effective manner, it will not only increase the contact resistance of the carbon brush and reduce its conductivity, but also accelerate the wear of the carbon brush and shorten the service life of the components. In severe cases, it may also cause malfunctions such as poor contact and sparking, directly affecting the operational stability and overall power generation efficiency of the wind turbine.

[0004] Currently, the common approach to heat dissipation in the collector ring compartment is forced air cooling. Simply put, this involves installing cooling fans on the side walls or rear of the collector ring compartment. The fans drive the airflow within the compartment, carrying away the accumulated heat through air convection. However, air itself has a low thermal conductivity, limiting the overall heat exchange capacity. Carbon brushes, being small, concentrated heat-generating components, have a high heat flux density due to the combination of frictional and Joule heat. Relying solely on air convection makes it difficult to quickly dissipate the heat, easily leading to continuous heat accumulation in localized areas of the carbon brush. This keeps the carbon brush operating at high temperatures for extended periods, hindering the improvement of power transmission efficiency and increasing the frequency and cost of unit maintenance. Summary of the Invention

[0005] The main objective of this invention is to provide an independent liquid cooling structure installed on a carbon brush box, which can effectively solve the problems mentioned above.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An independent liquid cooling structure mounted on a carbon brush cartridge includes:

[0008] A cooling chamber mechanism is used to fit and install itself on the side of the carbon brush, conduct the frictional heat and Joule heat generated by the operation of the carbon brush, and store coolant to complete the liquid phase vaporization process.

[0009] A circulating heat dissipation mechanism is sealed and connected to the cooling chamber mechanism. It is used to export the vaporized coolant and liquefy it, and then return the liquefied coolant to the cooling chamber mechanism to form an autonomous closed heat dissipation cycle.

[0010] The cooling chamber mechanism includes:

[0011] A base plate is fitted to the side of the carbon brush to directly conduct the heat generated by the carbon brush.

[0012] A lid, which is sealed and installed on the base plate, together with the base plate, forming a closed internal liquid storage cavity;

[0013] A capillary pump is installed in the internal liquid storage cavity of the base plate and is used to drive the coolant to circulate between the cavity and the circulating heat dissipation mechanism by capillary force.

[0014] The injection pipe is connected to the internal liquid storage cavity and is used to inject coolant into the cavity;

[0015] The circulating heat dissipation mechanism includes:

[0016] A gas pipe, one end of which is connected to the upper part of the internal liquid storage cavity, is used to transport the vaporized coolant.

[0017] A liquid pipe, one end of which is connected to the lower part of the internal liquid storage cavity, is used to transport the liquefied coolant back into the cavity;

[0018] The heat sink has an air inlet end connected to the other end of a gas pipe and a liquid outlet end connected to the other end of a liquid pipe, forming a gas-liquid circulation path for the coolant.

[0019] The heat sink is disposed on the outer surface of the heat sink to increase the heat dissipation area and to liquefy the gaseous coolant inside the heat sink.

[0020] Preferably, the base plate is made of aluminum material by CNC machining and T heat treatment, and the base plate has a groove cavity inside for accommodating the capillary pump.

[0021] Preferably, the cover is made of high-strength plastic material to prevent heat from escaping from the internal liquid storage cavity.

[0022] Preferably, the heat dissipation pipe is made of aluminum tubing, and the heat dissipation fins are made of aluminum plates.

[0023] Preferably, both the gas tube and the liquid tube are made of polytetrafluoroethylene.

[0024] Preferably, the capillary pump is a capillary core structure made of diatomaceous earth sintering.

[0025] Preferably, the internal liquid storage cavity is filled with a perfluoroether-based non-conductive coolant, and the cavity is in a vacuum-sealed state.

[0026] Preferably, the base plate and the cover are locked together with screws and sealed with sealant, and the injection tube, gas tube and liquid tube are connected and fixed to their corresponding connecting parts by sealing screws and sealant.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This invention adopts the closed-loop phase change heat dissipation principle, relying on the process of heat absorption by liquid phase vaporization and heat release by gas phase liquefaction of coolant to achieve heat transfer. Its heat exchange efficiency is much higher than that of conventional air convection. Combined with the vacuum-sealed internal liquid storage cavity, the phase change boiling point of the coolant can be reduced, and the heat dissipation cycle can be started when the carbon brush temperature rise is small, quickly dissipating the concentrated heat generated by the superposition of carbon brush friction heat and Joule heat, and avoiding the continuous accumulation of heat in the local area of ​​the carbon brush.

[0029] 2. The cooling structure of this invention is an independent unit design, which can be directly attached to the side of the carbon brush in the carbon brush box without the need for large-scale modification of the original brush holder and slip ring structure. Each set of carbon brushes can be independently configured with a heat dissipation unit, which can achieve precise heat dissipation of the heat-generating parts of the carbon brush. At the same time, the structure uses the capillary force generated by the sintered capillary core of diatomaceous earth as the circulation driving force, without the need for additional power pump and external power supply, which simplifies the overall structure and avoids the safety risks of electrical components in the slip ring chamber. Attached Figure Description

[0030] Figure 1 This is a schematic plan view of the overall structure of the present invention;

[0031] Figure 2 This is an axonometric view of the overall structure of the present invention.

[0032] In the diagram: 1. Base plate; 2. Capillary pump; 3. Cover; 4. Injection tube; 5. Liquid tube; 6. Heat dissipation tube; 7. Gas tube; 8. Heat sink. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] This solution is mainly used for carbon brush heat dissipation in wind power generation brush holders. During the operation of wind power generation equipment, the continuous friction between the carbon brush and the collector ring generates frictional heat. At the same time, the large current flowing through the carbon brush generates Joule heat. Both types of heat are difficult to dissipate effectively inside the collector ring chamber, which can easily cause power transmission obstruction and thus affect the overall power generation efficiency.

[0035] Existing heat dissipation methods mostly involve installing cooling fans on the side or rear of the collector ring compartment, relying on airflow to remove heat. However, the brush holder structure is complex, and air cannot circulate effectively in many gaps inside, making it impossible to form targeted heat dissipation for the carbon brush body, resulting in an unsatisfactory overall cooling effect.

[0036] This solution is an independent liquid cooling structure installed on the carbon brush box. It can be directly attached to the side of the carbon brush and directly and precisely dissipates heat from the carbon brush through a closed phase change heat dissipation cycle of liquid phase vaporization and gas phase liquefaction. It does not rely on the air flow inside the chamber and has a higher heat dissipation efficiency than traditional air cooling solutions. It can effectively solve the problem of reduced power transmission efficiency caused by heat accumulation on the carbon brush.

[0037] Example 1, as Figure 1 and Figure 2 As shown, an independent liquid cooling structure installed on a carbon brush box includes two main parts: a cooling chamber mechanism and a circulating heat dissipation mechanism. The cooling chamber mechanism is used to fit and install on the side of the carbon brush, directly conduct the frictional heat and Joule heat generated by the carbon brush during operation, and store coolant to complete the liquid phase vaporization process.

[0038] The circulating heat dissipation mechanism is sealed and connected to the cooling chamber mechanism. It is used to export the vaporized coolant and liquefy it, and then return the liquefied coolant to the cooling chamber mechanism to form an autonomous closed heat dissipation cycle.

[0039] Specifically, before implementing this cooling structure, the staff first attaches and fixes the cooling chamber mechanism to the side of the carbon brush inside the carbon brush box, so that the heat-conducting surface of the cooling chamber mechanism is in full contact with the side wall of the carbon brush to ensure heat conduction efficiency. Then, the circulating heat dissipation mechanism is arranged in the ventilation and heat dissipation area of ​​the collector ring chamber to ensure that the heat dissipation components can be in full contact with the outside air. Subsequently, coolant is injected into the cooling chamber mechanism through the liquid injection component, and vacuum sealing treatment is completed to build a stable and sealed environment for the closed heat dissipation cycle.

[0040] During operation, the heat generated by the carbon brushes is continuously conducted to the cooling chamber, causing the internal coolant to absorb the heat and undergo a phase change and vaporization. The gaseous coolant flows into the circulating heat dissipation mechanism, which dissipates the heat carried by the gaseous coolant to the outside air by increasing the heat dissipation area, causing the gaseous coolant to liquefy back into a liquid state. The liquefied coolant then flows back into the cooling chamber under the action of driving force, absorbing the heat conducted by the carbon brushes again. This process repeats continuously to form a self-heating cycle, achieving stable cooling of the carbon brushes.

[0041] When applied to carbon brush boxes of different specifications, the base plate size of the cooling chamber mechanism can be adjusted according to the carbon brush size. The pipe length and heat dissipation scale of the circulating heat dissipation mechanism can also be flexibly configured according to heat dissipation requirements, adapting to the carbon brush heat dissipation requirements of wind power generation equipment of different power, effectively improving the applicability and practicality of this structure.

[0042] Example 2, based on Example 1, further explains the cooling chamber mechanism and the circulating heat dissipation mechanism. In Example 2, the cooling chamber mechanism includes:

[0043] Base plate 1 is attached to the side of the carbon brush to directly conduct the heat generated by the carbon brush.

[0044] The cover 3 is sealed and installed on the base plate 1, and together with the base plate 1, it forms a closed internal liquid storage cavity.

[0045] Capillary pump 2 is installed in the liquid storage cavity inside the base plate 1 and is used to drive the coolant to circulate between the cavity and the circulating heat dissipation mechanism by capillary force.

[0046] Injection pipe 4 is connected to the internal liquid storage cavity and is used to inject coolant into the cavity.

[0047] The base plate 1 mentioned above is made of 6061 aluminum material, CNC machined and T6 heat treated. The base plate 1 has a groove cavity inside to accommodate the capillary pump 2. The cover 3 is made of high-strength plastic material to prevent the heat of the internal liquid storage cavity from escaping outward, reduce cold loss and improve heat utilization efficiency.

[0048] Specifically, the heat generated by the carbon brush is directly conducted to the base plate 1 through the side wall. The base plate 1, with its high thermal conductivity of aluminum, quickly transfers the heat to the coolant in the internal liquid storage cavity. The cover 3 is sealed to the base plate 1 to form a closed cavity, which provides a phase change storage space for the coolant and reduces the heat loss to the outside of the cavity through the low thermal conductivity of the plastic material, ensuring that the heat is preferentially absorbed by the coolant and improving the heat dissipation efficiency.

[0049] In the above, the injection pipe 4 is the injection channel of the cavity. After the coolant is injected and the vacuum pumping is completed, the injection pipe 4 is sealed to form a vacuum seal in the internal liquid storage cavity, thereby reducing the phase change boiling point of the coolant and improving the phase change heat dissipation response speed under low temperature conditions.

[0050] Furthermore, the circulating heat dissipation mechanism includes:

[0051] Gas pipe 7, one end of which is connected to the upper part of the internal liquid storage cavity, is used to transport the vaporized coolant.

[0052] Liquid pipe 5, one end of which is connected to the lower part of the internal liquid storage cavity, is used to transport the liquefied coolant back into the cavity.

[0053] The heat pipe 6 has an air inlet end connected to the other end of the gas pipe 7 and a liquid outlet end connected to the other end of the liquid pipe 5, forming a gas-liquid circulation path for the coolant.

[0054] Heat sink 8 is disposed on the outer surface of heat pipe 6 to increase the heat dissipation area and to liquefy the gaseous coolant inside heat pipe 6.

[0055] The heat pipe 6 mentioned above is made of 6063 aluminum tube, and the heat sink 8 is made of aluminum plate. It can quickly conduct heat inside the pipe to the outside air. The gas pipe 7 and the liquid pipe 5 are both made of polytetrafluoroethylene, which has good temperature resistance, corrosion resistance and sealing performance, and is suitable for the transportation needs of gas and liquid two-phase coolant.

[0056] Furthermore, the capillary pump 2 is a capillary core structure made of diatomaceous earth sintering, which can provide driving force for coolant circulation through capillary force, eliminating the need for an additional power pump and realizing a powerless autonomous closed-loop circulation, simplifying the structure while improving operational reliability.

[0057] Furthermore, the internal liquid storage cavity is filled with a perfluoroether-based non-conductive coolant, and the cavity is in a vacuum-sealed state. This ensures that the coolant has insulating properties, preventing electrical interference to the power transmission of the carbon brush. It also lowers the boiling point of the coolant through the vacuum environment, allowing the carbon brush to trigger thermal phase change heat dissipation at a lower temperature rise, thus improving the heat dissipation response speed.

[0058] Furthermore, the base plate 1 and the cover 3 are locked together with screws and sealed with sealant. The liquid injection pipe 4, gas pipe 7 and liquid pipe 5 are connected and fixed to their corresponding connecting parts by sealing screws and sealant, ensuring the sealing performance of the entire circulation loop, preventing coolant leakage and vacuum failure, and ensuring long-term operational stability.

[0059] Specifically, when the carbon brush continuously generates heat and the base plate 1 conducts the heat to the internal liquid storage cavity, the liquid coolant in the cavity absorbs the heat and boils and vaporizes. The gaseous coolant rises to the upper part of the cavity and flows into the heat dissipation pipe 6 through the gas pipe 7. The heat dissipation fins 8 on the outer wall of the heat dissipation pipe 6 greatly increase the contact area with the air, quickly dissipating the heat of the gaseous coolant to the external environment, causing the gaseous coolant to cool down and recondense into a liquid state.

[0060] In the above process, the liquefied coolant flows into the liquid pipe 5 along the heat dissipation pipe 6. Driven by the capillary force generated by the capillary pump 2, it flows back to the lower part of the internal liquid storage cavity of the base plate 1, where it absorbs the heat conducted by the carbon brush again and vaporizes, thus completing a complete closed heat dissipation cycle.

[0061] In the above, the capillary pump 2 serves as the core of the circulation, relying on capillary force to drive the coolant to circulate continuously without the need for an external power source or power components. This reduces structural complexity, avoids safety hazards of electrical components in the collector ring chamber, and improves the operational reliability and environmental adaptability of the device.

[0062] As described above, this cooling structure is an independent modular design that can be directly installed on the existing carbon brush box without requiring significant modifications to the original brush holder and slip ring structure. It is easy to install and maintain. Each carbon brush can be configured with an independent cooling structure, and each heat dissipation unit does not interfere with each other. It can provide precise heat dissipation for a single carbon brush, solving the problem that traditional air cooling cannot cover local areas of the carbon brush.

[0063] It should be noted that the screw sealing process, coolant filling and vacuuming process, and heat sink installation and fixing method used in this invention are all conventional design methods in the field, and will not be described in detail here.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An independent liquid cooling structure mounted on a carbon brush box, characterized in that, include: A cooling chamber mechanism is used to fit and install itself on the side of the carbon brush, conduct the frictional heat and Joule heat generated by the operation of the carbon brush, and store coolant to complete the liquid phase vaporization process. A circulating heat dissipation mechanism is sealed and connected to the cooling chamber mechanism. It is used to export the vaporized coolant and liquefy it, and then return the liquefied coolant to the cooling chamber mechanism to form an autonomous closed heat dissipation cycle. The cooling chamber mechanism includes: The base plate (1) is attached to the side of the carbon brush and is used to directly conduct the heat generated by the carbon brush. The cover (3) is sealed and installed on the base plate (1), and together with the base plate (1) forms a closed internal liquid storage cavity; The capillary pump (2) is installed in the liquid storage cavity inside the base plate (1) and is used to drive the coolant to circulate between the cavity and the circulating heat dissipation mechanism by capillary force. The injection pipe (4) is connected to the internal liquid storage cavity and is used to inject coolant into the cavity; The circulating heat dissipation mechanism includes: Gas pipe (7), one end of which is connected to the upper part of the internal liquid storage cavity, for conveying the vaporized coolant; Liquid pipe (5), one end of which is connected to the lower part of the internal liquid storage cavity, is used to transport the liquefied coolant back into the cavity; The heat sink (6) has an air inlet end connected to the other end of the gas pipe (7) and a liquid outlet end connected to the other end of the liquid pipe (5), forming a gas-liquid circulation path for the coolant. Heat sink (8) is disposed on the outer surface of heat dissipation pipe (6) to increase the heat dissipation area and to dissipate and liquefy the gaseous coolant in heat dissipation pipe (6).

2. The independent liquid cooling structure according to claim 1, characterized in that: The base plate (1) is made of 6061 aluminum material by CNC machining and T6 heat treatment. The base plate (1) has a groove cavity inside for accommodating the capillary pump (2).

3. The independent liquid cooling structure according to claim 1, characterized in that: The cover (3) is made of high-strength plastic material to prevent the heat of the internal liquid storage cavity from escaping.

4. The independent liquid cooling structure according to claim 1, characterized in that: The heat sink (6) is made of 6063 aluminum tube, and the heat sink (8) is made of aluminum plate.

5. The independent liquid cooling structure according to claim 1, characterized in that: Both the gas tube (7) and the liquid tube (5) are made of polytetrafluoroethylene.

6. The independent liquid cooling structure according to claim 1, characterized in that: The capillary pump (2) is a capillary core structure made of diatomaceous earth sintering.

7. The independent liquid cooling structure according to claim 1, characterized in that: The internal liquid storage cavity is filled with a perfluoroether-based non-conductive coolant, and the cavity is in a vacuum-sealed state.

8. The independent liquid cooling structure according to claim 1, characterized in that: The base plate (1) and the cover (3) are locked together by screws and sealed with sealant. The injection tube (4), gas tube (7) and liquid tube (5) are connected and fixed to their corresponding connecting parts by sealing screws and sealant.

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