Liquid cooling circulating type power grid transformer heat dissipation mechanism

Abstract

The application provides a liquid cooling circulating power grid transformer heat dissipation mechanism, and relates to the technical field of transformers, which comprises a radiator and a water distributor, wherein the radiator comprises a plurality of radiating fins; the water distributor comprises a water supply assembly and a water distribution groove arranged on the wall surface of the radiating fin, the water supply assembly is used for supplying cooling water to the water distribution groove, the length direction of the water distribution groove is horizontally arranged and parallel to the wall surface of the radiating fin, the side wall of the water distribution groove is arranged at intervals from the wall surface of the radiator, and overflow ports are formed on the side wall of the water distribution groove, wherein the overflow ports are uniformly distributed along the length direction of the water distribution groove; the cooling water in the water distribution groove uniformly flows out through the overflow ports, forms an initial liquid film on the wall surface of the radiating fin, and flows down continuously, so as to assist in heat dissipation of the radiating fin, avoid liquid drop rebound and splashing of the cooling water on the wall surface of the radiating fin, and to a certain extent, avoid the cooling water liquid film from converging into a strand when flowing down, improve the effective coverage area of the liquid film, and ensure the auxiliary heat dissipation effect of the radiating fin.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a liquid-cooled circulating heat dissipation mechanism for power grid transformers. Background Technology

[0002] As a core component of the power system, the losses generated by the windings and core of a power transformer during operation are converted into heat. The internal temperature of the equipment directly affects the aging rate and service life of the insulation materials. Therefore, an efficient and reliable heat dissipation and cooling system is a key component in ensuring the safe and stable operation of the transformer. Currently, oil-immersed transformers widely use mineral insulating oil as the heat transfer medium. The flow of the oil carries internal heat to the heat dissipation surface, where it exchanges heat with the external environment. After long-term technological development, several mature cooling methods have been developed. Among them, the oil-immersed self-cooling method relies on the density difference of the oil to form a natural circulation, combined with the oil tank wall, tubular or plate radiators, and natural convection with the air for heat dissipation. It has a simple and reliable structure and is mostly used in small and medium-capacity transformers. The oil-immersed air-cooling method adds a fan to the self-cooling method to accelerate the airflow between the heat dissipation fins and improve the heat dissipation capacity. It is suitable for medium and large-capacity applications. The forced oil circulation air-cooling method adds a submersible oil pump to the oil-immersed air-cooling method to drive the insulating oil to circulate forcibly, resulting in higher heat dissipation efficiency. It is widely used in large power transformers. Forced oil circulation water cooling uses water as a secondary cooling medium. The flow of water carries away the heat from the radiator to assist in heat dissipation, resulting in stronger heat dissipation capacity. It is often used in enclosed environments such as underground substations.

[0003] When using spraying to assist cooling transformer radiators, the cooling water is prone to droplet rebound and splashing when it impacts the radiator wall, making it difficult to form a uniform and continuous initial liquid film on the wall. At the same time, the water flow flowing downward along the radiator wall will gradually contract and converge into streams, reducing the effective coverage area of ​​the liquid film and thus affecting the auxiliary heat dissipation effect on the radiator.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a liquid-cooled circulating power grid transformer heat dissipation mechanism to address the problems existing in current transformer heat dissipation mechanisms.

[0006] The above objectives are achieved through the following technical solutions: A liquid-cooled circulating heat dissipation mechanism for a power grid transformer includes: The radiator includes multiple heat sinks stacked in sequence and having cavities. The cavities of the heat sinks are connected to the inside of the transformer and filled with circulating insulating oil. A water distributor includes a water supply component and a water distribution trough disposed on the wall of a heat sink. The water supply component is used to supply cooling water to the water distribution trough. The water distribution trough is horizontally arranged along its length and parallel to the wall of the heat sink. The side wall of the water distribution trough is spaced apart from the wall of the heat sink, and an overflow port is formed on the side wall of the water distribution trough. The lowest point of the overflow port is higher than the lowest point inside the water distribution trough. Multiple overflow ports are evenly distributed along the length of the water distribution trough.

[0007] Furthermore, at least two water distribution tanks are arranged at intervals, one above the other. In two adjacent water distribution tanks, the upper water distribution tank is equipped with an overflow pipe, and the cooling water in the upper water distribution tank can enter the lower water distribution tank through the overflow pipe. The highest point of the overflow pipe is higher than the lowest point of the overflow port. In all water distribution tanks, the water supply assembly is used to supply cooling water to the uppermost water distribution tank.

[0008] Furthermore, two water distributors are arranged at intervals, one above the other. The sidewalls of all water distribution channels of the upper water distributor are at a first distance from the radiator wall, and the sidewalls of all water distribution channels of the lower water distributor are at a second distance from the radiator wall. The first distance is greater than the second distance. In all water distribution channels of the two water distributors, the water supply assembly supplies cooling water to the water distribution channel located at the top.

[0009] Furthermore, in all the water distribution tanks of the two water distributors, the water supply assembly provides cooling water at a first flow rate to the uppermost water distribution tank; each water distribution tank of the lower water distributor is equipped with a detection module, which is used to obtain the liquid level value of the cooling water in its respective water distribution tank; when the sum of all liquid level values ​​is equal to a preset value, the water supply assembly keeps the first flow rate constant; when the sum of all liquid level values ​​is less than the preset value, the water supply assembly increases the first flow rate; when the sum of all liquid level values ​​is greater than the preset value, the water supply assembly decreases the first flow rate.

[0010] Furthermore, the sidewall of the water distribution trough is provided with guide elements, and multiple guide elements are evenly distributed along the length of the water distribution trough.

[0011] Furthermore, it also includes a fan located on one side of the transformer, which is used to blow air horizontally between two adjacent heat sinks.

[0012] Furthermore, in the same water distribution trough, all guide members consist of a first part and a second part. The first part of the guide member is located at the end of the water distribution trough away from the fan, and its length direction is vertically arranged. The second part of the guide member is located at the end of the water distribution trough closer to the fan, and its length direction forms a first angle with the vertical plane. In all the water distribution troughs of the upper water distributor, the first distance gradually decreases. In all the water distribution troughs of the lower water distributor, the second distance gradually decreases. In the same water distributor, the length direction of the second part of the guide member in the uppermost water distribution trough gradually approaches the fan from top to bottom, while the length direction of the second part of the guide member in the other water distribution troughs gradually moves away from the fan from top to bottom, and the first angle gradually decreases from top to bottom.

[0013] Furthermore, the first included angle of the second part of the guide element in the same water distribution trough gradually decreases from near to far from the fan.

[0014] Furthermore, the width of the overflow port gradually increases from bottom to top.

[0015] Furthermore, within the same water distribution trough, multiple overflow pipes are evenly distributed along the length of the trough.

[0016] The present invention has at least the following beneficial effects: Cooling water in the water distribution tank flows out evenly through multiple overflow outlets, forming a uniform and continuous initial liquid film on the heat sink wall and flowing down to assist in heat dissipation of the heat sink. This prevents cooling water droplets from bouncing and splashing on the heat sink wall, and also prevents the cooling water film from contracting and converging into streams as it flows downwards, thereby increasing the effective coverage area of ​​the liquid film and ensuring the auxiliary heat dissipation effect on the heat sink. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the liquid-cooled circulating power grid transformer heat dissipation mechanism installed on a transformer according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the water distributor. Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a top view of the water distributor; Figure 6 for Figure 5 CC-direction sectional view; Figure 7 for Figure 6 A magnified view of a section at point D; Figure 8 for Figure 6EE-directed sectional view; Figure 9 for Figure 8 A magnified view of a section at point F.

[0018] in: 100. Transformer; 101. Oil tank; 102. Fan; 200. Radiator; 201. Heat sink; 300. Water distributor; 301. Water distribution trough; 302. Overflow outlet; 303. Frame; 304. Water pipe; 305. Water outlet; 306. Overflow pipe; 307. Flow guide. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1 to 9As shown, this embodiment of the invention provides a liquid-cooled circulating power grid transformer heat dissipation mechanism (hereinafter referred to as the heat dissipation mechanism), including a radiator 200 and a water distributor 300. The radiator 200 includes a plurality of heat dissipation fins 201 stacked sequentially and having cavities. The cavities of the heat dissipation fins 201 are connected to the interior of the transformer 100 and filled with circulating insulating oil. The water distributor 300 includes a water supply component and a water distribution trough 301 disposed on the wall of the heat dissipation fins 201. The water supply component is used to supply cooling water to the water distribution trough 301. The length direction of the water distribution trough 301 is horizontally arranged and parallel to the wall of the heat dissipation fins 201. The side wall of the water distribution trough 301 is spaced apart from the wall of the radiator 200, and an overflow port 302 is formed on the side wall of the water distribution trough 301. The lowest point of the overflow port 302 is higher than the lowest point inside the water distribution trough 301. A plurality of overflow ports 302 are evenly distributed along the length direction of the water distribution trough 301.

[0023] Cooling water in the water distribution tank 301 flows out evenly through multiple overflow ports 302, forming a uniform and continuous initial liquid film on the wall of the heat sink 201 and flowing down to assist in heat dissipation of the heat sink 201. This prevents cooling water droplets from bouncing and splashing on the wall of the heat sink 201, and also prevents the cooling water film from contracting and converging into streams as it flows downwards, thereby increasing the effective coverage area of ​​the liquid film and ensuring the auxiliary heat dissipation effect on the heat sink 201.

[0024] The transformer 100 is equipped with components such as an oil conservator 101 and a submersible oil pump. The oil conservator 101 is used to compensate for the volume expansion and contraction of the insulating oil due to temperature changes, and the submersible oil pump is used to drive the insulating oil to circulate between the transformer 100 and the heat sink 201. The structure and working principle of the transformer 100 and the submersible oil pump are existing technologies and will not be described in detail here.

[0025] See also Figure 1 The transformer 100 has heat sinks 200 on both sides. Each heat sink 200 includes multiple stacked heat sink fins 201. These stacked fins 201 are further evenly distributed horizontally to improve the heat dissipation of the insulating oil inside the transformer 100. This arrangement of the heat sink 200 is existing technology and will not be described in detail here. See [link to relevant documentation]. Figures 2 to 4 The water distributor 300 includes a frame 303 and multiple water distribution grooves 301 located on the frame 303. The frame 303 is matched with the heat sink 200 on one side of the transformer 100, so that water distribution grooves 301 are arranged on both sides of the multiple heat sinks 201 located on the same vertical plane to provide auxiliary heat dissipation to the walls on both sides of the heat sinks 201.

[0026] The water supply assembly includes a water pipe 304, the length direction of the water pipe 304 is perpendicular to the wall surface of the heat dissipation fin 201, a plurality of the water pipes 304 may be evenly distributed along the horizontal direction, a plurality of water outlets 305 are evenly distributed on the water pipe 304 along the length direction thereof, and water from the water outlets 305 can exactly fall into the uppermost water distribution tank 301. The water supply assembly further includes structures such as a water storage tank, a regulating valve, and a cooling unit matched with the water pipe 304, which can supply cooling water to the water pipe 304 at a certain flow rate, and the specific structural composition and working principle thereof are all in the prior art, and will not be elaborated herein.

[0027] In one of the embodiments, at least two water distribution tanks 301 are arranged at intervals in the up-down direction. Between two adjacent water distribution tanks 301, the upper water distribution tank 301 is internally provided with an overflow pipe 306, and cooling water in the upper water distribution tank 301 can enter the lower water distribution tank 301 through the overflow pipe 306, where the highest point of the overflow pipe 306 is higher than the lowest point of the overflow port 302. Among all the water distribution tanks 301, the water supply assembly is configured to supply cooling water to the uppermost water distribution tank 301.

[0028] The water supply assembly is only used to supply cooling water to the uppermost water distribution tank 301, and the uppermost water distribution tank 301 always operates to form a liquid film on the wall surface of the heat dissipation fin 201, while the excess cooling water enters the lower water distribution tank 301 through the overflow pipe 306. The operation of the lower water distribution tank 301 can simultaneously form a liquid film on the wall surface of the heat dissipation fin 201, which can compensate for the thickness loss of the liquid film formed by the upper water distribution tank 301 caused by evaporation when the liquid film flows downward. Meanwhile, since at least two uniform and continuous liquid films are formed, the cooling water liquid film is further prevented from shrinking and converging into streams when flowing downward, the effective coverage area of the liquid film is increased, and the auxiliary heat dissipation effect on the heat dissipation fin 201 is ensured.

[0029] Furthermore, as the water supply increases, the effective overflow area of ​​the overflow port 302 increases, resulting in more water overflowing from the overflow port 302 and a thicker liquid film, enabling adaptive adjustment of the liquid film thickness. Further, the width of the overflow port 302 gradually increases from bottom to top. With a larger water supply, the effective overflow area of ​​the overflow port 302 increases even faster, resulting in more water overflowing from the overflow port 302 more and faster. When the water supply increases to the point where the cooling water level in the uppermost water distribution tank 301 is higher than the highest point of the overflow port 302, if only one water tank is installed, the effective overflow area of ​​the overflow port 302 is a constant and at its maximum value. The overflow port 302 loses its ability to adjust the liquid film thickness, and excess cooling water continues to overflow from the overflow port 302, affecting the stability of the liquid film. Therefore, the heat dissipation mechanism of the present invention has at least two layers of water distribution tanks 301 in the same water distributor 300. When the water supply increases, the cooling water level in the uppermost water distribution tank 301 is higher than the highest point of the overflow pipe 306, so that the cooling water in the uppermost water distribution tank 301 enters the lower water distribution tank 301 through the overflow pipe 306, and the lower water distribution tank 301 is activated to form a liquid film. This film can compensate for the thickness loss caused by evaporation when the liquid film formed by the uppermost water distribution tank 301 flows downward. At the same time, the overflow port 302 of the uppermost water distribution tank 301 restores the function of adjusting the thickness of the liquid film, thereby ensuring the stability of the liquid film to a greater extent.

[0030] The number of water distribution troughs 301 is preferably three. See also... Figure 9 Only the two upper water distribution tanks 301 are equipped with overflow pipes 306, allowing the cooling water in the multiple water distribution tanks 301 to flow downwards sequentially. The number of water distribution tanks 301 to be used can be selected according to the actual application. Furthermore, in the same water distribution tank 301, multiple overflow pipes 306 are evenly distributed along the length of the water distribution tank 301.

[0031] In one embodiment, two water distributors 300 are arranged vertically at intervals. The sidewalls of all water distribution channels 301 of the upper water distributor 300 are at a first distance from the wall of the radiator 200, and the sidewalls of all water distribution channels 301 of the lower water distributor 300 are at a second distance from the wall of the radiator 200. The first distance is greater than the second distance. In all the water distribution channels 301 of the two water distributors 300, the water supply assembly supplies cooling water to the uppermost water distribution channel 301.

[0032] When the liquid film formed by the water distribution groove 301 of the upper water distributor 300 flows downward on the wall of the heat sink 201, it may gradually contract and converge into streams, reducing the effective coverage area of ​​the liquid film and thus affecting the auxiliary heat dissipation effect on the heat sink 201. The heat dissipation mechanism of this invention uses two water distributors 300. Because the first distance is greater than the second distance, the sidewalls of all the water distribution grooves 301 of the lower water distributor 300 are closer to the wall of the heat sink 201. Therefore, when the liquid film formed by the upper water distributor 300 gradually contracts and converges into streams, some of the water can be collected by the lower water distributor 300 and reformed into a continuous and uniform liquid film on the lower half of the wall of the heat sink 201. This further improves the uniformity of the liquid film distribution, further prevents the cooling water film from contracting and converging into streams when flowing downward, increases the effective coverage area of ​​the liquid film on the lower half of the wall of the heat sink 201, and ensures the auxiliary heat dissipation effect on the heat sink 201.

[0033] See Figure 1 Two water distributors 300 are arranged vertically at intervals. The upper water distributor 300 is located at the top of the heatsink 201, and the lower water distributor 300 is located in the middle of the heatsink 201. The two water distributors 300 are identical in structure except for their placement and the first and second distances. Two fans 102 can also be arranged vertically at intervals, with each water distributor 300 higher than the fan 102.

[0034] In one embodiment, in all the water distribution tanks 301 of the two water distributors 300, the water supply assembly provides cooling water at a first flow rate to the uppermost water distribution tank 301; each of the water distribution tanks 301 of the lower water distributor 300 is equipped with a detection module, which is used to obtain the liquid level value of the cooling water in its respective water distribution tank 301; when the sum of all liquid level values ​​is equal to a preset value, the water supply assembly keeps the first flow rate constant; when the sum of all liquid level values ​​is less than the preset value, the water supply assembly increases the first flow rate; when the sum of all liquid level values ​​is greater than the preset value, the water supply assembly decreases the first flow rate.

[0035] As the liquid film formed by the upper water distributor 300 flows downwards, it is gradually heated and evaporated by the heat sink 201, causing the liquid film to gradually thin. Therefore, the larger the sum of all liquid level values, the greater the evaporation of the liquid film formed by the upper water distributor 300, the higher the temperature of the heat sink 201, and the higher the temperature of the insulating oil inside the transformer 100. If the auxiliary cooling power of the cooling water is not adjusted in time, it will affect the auxiliary cooling effect on the heat sink 201, further affecting the normal operation of the transformer 100. The heat dissipation mechanism of this invention is equipped with a detection module. When the sum of all liquid level values ​​is equal to a preset value, it indicates that the evaporation of the liquid film formed by the upper water distributor 300 is moderate, and the water supply component keeps the first flow rate constant. When the sum of all liquid level values ​​is less than the preset value, it indicates that the evaporation of the liquid film formed by the upper water distributor 300 is large, and the water supply component increases the first flow rate. In the same water distributor 300, more water distribution tanks 301 can be used to increase the auxiliary cooling power of the cooling water. When the sum of all liquid level values ​​exceeds a preset value, it indicates that the evaporation rate of the liquid film formed by the upper water distributor 300 is relatively small. The water supply component reduces the first flow rate, allowing fewer water distribution tanks 301 to be used within the same water distributor 300, thus reducing the auxiliary cooling power of the cooling water. Compared to adjusting the auxiliary cooling power of the cooling water based on the internal insulating oil temperature of the transformer 100, the heat dissipation mechanism of this invention controls and determines the first flow rate of the water supply component based on the evaporation rate of the liquid film formed by the upper water distributor 300, thereby adjusting the auxiliary cooling power of the cooling water. This method is more representative, and the matching accuracy between the auxiliary cooling power and the operating temperature of the transformer 100 is higher.

[0036] The detection module is a liquid level sensor and is equipped with a processor. All detection modules acquire the liquid level values ​​of cooling water in all water distribution tanks 301 of the lower water distributor 300. The processor sums these liquid level values ​​and compares them with preset values, thereby controlling the water supply components to achieve the process of adjusting the first flow rate.

[0037] In one embodiment, see [link to relevant documentation]. Figure 4 and Figure 7 The side wall of the water distribution trough 301 is provided with a flow guide 307, and multiple flow guides 307 are evenly distributed along the length of the water distribution trough 301.

[0038] When the cooling water in the water distribution tank 301 flows out evenly through multiple overflow ports 302, the guide member 307 can make the overflowing cooling water more even along the length of the water distribution tank 301, thereby improving the uniformity of the liquid film formation.

[0039] The guide member 307 is strip-shaped, and the lower end of the guide member 307 is flush with the bottom surface of the water distribution tank 301, while the upper end of the guide member 307 is flush with the lowest point of the overflow port 302.

[0040] In one embodiment, a fan 102 is also provided on one side of the transformer 100, the fan 102 being used to blow air between two adjacent heat sinks 201 in the horizontal direction.

[0041] The fan 102 blows air horizontally between two adjacent heat sinks 201 to accelerate the airflow in the gap between the two adjacent heat sinks 201, thereby improving the auxiliary heat dissipation effect of the heat sinks 201 in conjunction with the cooling water.

[0042] It is worth noting that the heat dissipation mechanism of the present invention can adopt the corresponding heat dissipation mode according to the different working states of the transformer 100. For example, temperature sensors can be set at different positions inside the transformer 100 to obtain the temperature of the insulating oil at different positions inside the transformer 100 and take its average value as a reference. As the average value increases, different heat dissipation modes can be switched in sequence, including: (1) the fan 102, the submersible pump and the water supply component are all stopped, which is the oil-immersed self-cooling heat dissipation mode; (2) the fan 102 is run alone, which is the oil-immersed air-cooling heat dissipation mode; (3) the fan 102 and the submersible pump are run at the same time, which is the forced oil circulation air-cooling heat dissipation mode; (4) the fan 102, the submersible pump and the water supply component are run at the same time, which is the forced oil circulation air-cooling and water-cooling combined heat dissipation mode. Since the average temperature of the insulating oil has risen to a high value, on the basis of this heat dissipation mode, the first flow rate of the water supply component can be controlled and determined according to the evaporation of the liquid film formed by the water distributor 300 located above, thereby adjusting the auxiliary cooling power of the cooling water.

[0043] In one embodiment, in the same water distribution trough 301, all guide members 307 are composed of a first part and a second part. The first part of the guide member 307 is located at the end of the water distribution trough 301 away from the fan 102, and the length direction of the first part of the guide member 307 is vertically arranged. The second part of the guide member 307 is located at the end of the water distribution trough 301 close to the fan 102, and the length direction of the second part of the guide member 307 forms a first angle with the vertical plane. In all the water distribution troughs 301 of the upper water distributor 300, the first distance gradually decreases. In all the water distribution troughs 301 of the lower water distributor 300, the second distance gradually decreases. In the same water distributor 300, the length direction of the second part of the guide member 307 of the uppermost water distribution trough 301 gradually approaches the fan 102 from top to bottom, and the length direction of the second part of the guide member 307 of the other water distribution troughs 301 gradually moves away from the fan 102 from top to bottom, and the first angle gradually decreases from top to bottom.

[0044] The air blown by fan 102 exerts a blowing force on the liquid film formed on the wall of heat sink 201, causing the liquid film to deviate from its original vertical downward flow direction and flow at an angle away from fan 102. This makes the liquid film more prone to gradually contracting and merging into streams, affecting the uniformity of the liquid film and the heat dissipation effect on heat sink 201. After the cooling water in the water distribution tank 301 of the heat dissipation mechanism of the present invention flows out evenly through multiple overflow ports 302, the cooling water still maintains its original vertical downward flow direction after passing through the first guide member 307. After passing through the second guide member 307, the cooling water deviates from its original vertical downward flow direction and flows at an angle.

[0045] Specifically, when the first flow rate is small, only the uppermost water distribution tank 301 is activated. At this time, the liquid film formed by the uppermost water distribution tank 301 is relatively thin and is greatly affected by the airflow from the fan 102. Therefore, after the cooling water passes through the guide 307 of the second part of the uppermost water distribution tank 301, it will flow at an angle closer to the fan 102, and the angle of inclination needs to be large. When the liquid film formed by the uppermost water distribution tank 301 passes through the airflow from the fan 102, it can counteract the influence of the airflow from the fan 102 and return to the original vertical downward flow direction, ensuring the uniformity of the liquid film and the auxiliary heat dissipation effect on the heat sink 201.

[0046] As the initial flow rate increases, more water distribution troughs 301 are activated, for example, the two uppermost water distribution troughs 301 are activated. At this time, the liquid film formed by the uppermost water distribution trough 301 is thicker and less affected by the wind. If not interfered with, the liquid film will still flow at an angle towards the fan 102 after passing through the air blown by the fan 102. Therefore, the second part of the guide member 307 of the lower water distribution trough 301 is set in the opposite direction with a smaller first included angle, so that the liquid film formed by it flows at an angle away from the fan 102. Furthermore, the tilt angle is relatively small, thereby achieving the following: the liquid film formed by the lower water distribution tank 301 and the liquid film formed by the uppermost water distribution tank 301 interact to correct their respective flow directions, so that the liquid film after the two merge still flows tilted towards the direction closer to the fan 102, but the tilt angle is reduced. When the merged liquid film passes through the air blown out by the fan 102, it can counteract the influence of the air blown out by the fan 102 and return to the original vertical downward flow direction, ensuring the uniformity of the liquid film and the auxiliary heat dissipation effect on the heat sink 201.

[0047] It is worth noting that, since both the first and second distances gradually decrease, the liquid film formed by the upper water distribution tank 301 will not contact the guide member 307 located in the lower water distribution tank 301, and therefore will not change the flow direction of the liquid film formed by the upper water distribution tank 301.

[0048] exist Figure 1In the middle, fan 102 is located to the right of transformer 100, therefore in Figure 7 In the first part, the guide member 307 is located at the left end of the water distribution tank 301, and the guide member 307 is located at the right end of the water distribution tank 301. The number of guide members 307 in the first part is greater than the number of guide members 307 in the second part. Furthermore, considering that the blowing force of the air from the fan 102 on the liquid film gradually decreases from right to left, the number of guide members 307 in the first part is much greater than the number of guide members 307 in the second part. In other words, only a small portion of the guide members 307 on the right side are inclined in the length direction, while most of the guide members 307 on the left side are vertically aligned in the length direction. Additionally, the number of guide members 307 in the second part of adjacent water distribution tanks 301 is equal, and they correspond one-to-one vertically.

[0049] exist Figure 7 In the three water distribution tanks 301 from top to bottom, the second part of the guide member 307 on the first water distribution tank 301 is inclined from top to bottom and from left to right, and the second part of the guide member 307 on the second and third water distribution tanks 301 is inclined from top to bottom and from right to left. At the same vertical position, the first included angle of the second part of the guide member 307 on the three water distribution tanks 301 gradually decreases from top to bottom.

[0050] In one embodiment, the first included angle of the second portion of the guide member 307 of the same water distribution trough 301 gradually decreases from near to far from the fan 102.

[0051] The blowing force exerted by the airflow from fan 102 on the liquid film gradually decreases as it approaches and moves away from fan 102. Therefore, the first included angle of the second part of the heat dissipation mechanism, the airflow guide 307, gradually decreases as it approaches and moves away from fan 102. Figure 7 In the middle, the first included angle of the second part of the guide 307 gradually decreases from right to left, so that the cooling water flows at an angle towards the fan 102 after passing through the second part of the guide 307. And the angle of the cooling water becomes smaller and smaller from the direction of approaching to away from the fan 102, so as to adapt to the blowing force generated by the fan 102 and make the liquid film formed on the wall of the heat sink 201 more uniform.

[0052] The working principle of the heat dissipation mechanism of this invention is as follows: When the fan 102, submersible oil pump, and water supply assembly operate simultaneously, the submersible oil pump drives the insulating oil to circulate forcibly between the transformer 100 and the heat sink 201. The fan 102 blows air horizontally between two adjacent heat sinks 201 to accelerate the airflow in the gap between the two adjacent heat sinks 201. The water supply assembly provides a first flow rate of cooling water through the outlet 305 on the water pipe 304 located in the uppermost water distribution trough 301. The cooling water in the uppermost water distribution trough 301 flows out evenly through multiple overflow ports 302. The guide 307 makes the overflowing cooling water more even along the length of the water distribution trough 301, and forms a uniform and continuous initial liquid film on the wall of the heat sink 201 and flows down to assist in the cooling of the heat sink 201. This avoids the cooling water droplets from bouncing and splashing on the wall of the heat sink 201, and also prevents the cooling water film from contracting and converging into streams as it flows downward, increasing the effective coverage area of ​​the liquid film and ensuring the auxiliary cooling effect on the heat sink 201. The liquid film formed by the upper water distributor 300 flows downward, and some of the water can be collected by the lower water distributor 300 and reformed into a continuous and uniform liquid film on the lower half of the heat sink 201 wall. This further improves the uniformity of the liquid film distribution, further prevents the cooling water film from contracting and converging when flowing downward, and increases the effective coverage area of ​​the liquid film on the lower half of the heat sink 201 wall, ensuring the auxiliary heat dissipation effect of the heat sink 201.

[0053] In the lower water distributor 300, the detection module acquires the real-time liquid level value of the cooling water in its corresponding water distribution tank 301. When the sum of all liquid level values ​​equals a preset value, it indicates that the liquid film evaporation rate formed by the upper water distributor 300 is moderate, and the water supply component keeps the first flow rate constant. When the sum of all liquid level values ​​is less than the preset value, it indicates that the liquid film evaporation rate formed by the upper water distributor 300 is large, and the water supply component increases the first flow rate. In the same water distributor 300, more water distribution tanks 301 can be used to improve the auxiliary cooling power of the cooling water. When the sum of all liquid level values ​​is greater than the preset value, it indicates that the liquid film evaporation rate formed by the upper water distributor 300 is small, and the water supply component decreases the first flow rate. In the same water distributor 300, fewer water distribution tanks 301 can be used to reduce the auxiliary cooling power of the cooling water. Compared to adjusting the auxiliary cooling power of the cooling water based on the internal insulating oil temperature of the transformer 100, the heat dissipation mechanism of this invention controls and determines the first flow rate of the water supply component based on the evaporation rate of the liquid film formed by the upper water distributor 300, thereby adjusting the auxiliary cooling power of the cooling water. This is more representative, and the matching accuracy between the auxiliary cooling power and the operating temperature of the transformer 100 is higher. Moreover, when the water supply component increases the first flow rate, the cooling water level in the uppermost water distribution tank 301 is higher than the highest point of the overflow pipe 306, allowing the cooling water in the uppermost water distribution tank 301 to enter the lower water distribution tank 301 through the overflow pipe 306. This activates the lower water distribution tank 301 to form a liquid film, which can compensate for the thickness loss caused by evaporation when the liquid film formed by the uppermost water distribution tank 301 flows downward. At the same time, the overflow port 302 of the uppermost water distribution tank 301 resumes its function of adjusting the liquid film thickness, thereby ensuring the stability of the liquid film to a greater extent.

[0054] In addition, when the first flow rate is small, only the uppermost water distribution tank 301 is activated. At this time, the liquid film formed by the uppermost water distribution tank 301 is relatively thin and is greatly affected by the airflow from the fan 102. Therefore, after the cooling water passes through the guide 307 of the second part of the uppermost water distribution tank 301, it will flow at an angle closer to the fan 102, and the angle of inclination needs to be large. When the liquid film formed by the uppermost water distribution tank 301 passes through the airflow from the fan 102, it can counteract the influence of the airflow from the fan 102 and return to the original vertical downward flow direction, ensuring the uniformity of the liquid film and the auxiliary heat dissipation effect on the heat sink 201. As the initial flow rate increases, more water distribution troughs 301 are activated, for example, the two uppermost water distribution troughs 301 are activated. At this time, the liquid film formed by the uppermost water distribution trough 301 is thicker and less affected by the wind. If not interfered with, the liquid film will still flow at an angle towards the fan 102 after passing through the air blown by the fan 102. Therefore, the second part of the guide member 307 of the lower water distribution trough 301 is set in the opposite direction with a smaller first included angle, so that the liquid film formed by it flows at an angle away from the fan 102. Furthermore, the tilt angle is relatively small, thereby achieving the following: the liquid film formed by the lower water distribution tank 301 and the liquid film formed by the uppermost water distribution tank 301 interact to correct their respective flow directions, so that the liquid film after the two merge still flows tilted towards the direction closer to the fan 102, but the tilt angle is reduced. When the merged liquid film passes through the air blown out by the fan 102, it can counteract the influence of the air blown out by the fan 102 and return to the original vertical downward flow direction, ensuring the uniformity of the liquid film and the auxiliary heat dissipation effect on the heat sink 201.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A liquid-cooled circulating heat dissipation mechanism for a power grid transformer, characterized in that, include: The radiator includes multiple heat sinks stacked in sequence and having cavities. The cavities of the heat sinks are connected to the inside of the transformer and filled with circulating insulating oil. A water distributor includes a water supply component and a water distribution trough disposed on the wall of a heat sink. The water supply component is used to supply cooling water to the water distribution trough. The water distribution trough is horizontally arranged along its length and parallel to the wall of the heat sink. The side wall of the water distribution trough is spaced apart from the wall of the heat sink, and an overflow port is formed on the side wall of the water distribution trough. The lowest point of the overflow port is higher than the lowest point inside the water distribution trough. Multiple overflow ports are evenly distributed along the length of the water distribution trough.

2. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 1, characterized in that, At least two water distribution tanks are arranged at intervals. In two adjacent water distribution tanks, the upper water distribution tank is equipped with an overflow pipe, and the cooling water in the upper water distribution tank can enter the lower water distribution tank through the overflow pipe. The highest point of the overflow pipe is higher than the lowest point of the overflow outlet. In all water distribution tanks, the water supply assembly is used to supply cooling water to the uppermost water distribution tank.

3. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 2, characterized in that, Two water distributors are arranged at an interval, one above the other. There is a first distance between the side walls of all the water distribution channels of the upper water distributor and the radiator wall, and a second distance between the side walls of all the water distribution channels of the lower water distributor and the radiator wall. The first distance is greater than the second distance. In all the water distribution channels of the two water distributors, the water supply assembly supplies cooling water to the water distribution channel located at the top.

4. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 3, characterized in that, In all the water distribution tanks of the two water distributors, the water supply assembly provides cooling water at a first flow rate to the uppermost water distribution tank; each water distribution tank of the lower water distributor is equipped with a detection module, which is used to obtain the liquid level value of the cooling water in its respective water distribution tank; when the sum of all liquid level values ​​is equal to a preset value, the water supply assembly keeps the first flow rate constant; when the sum of all liquid level values ​​is less than the preset value, the water supply assembly increases the first flow rate; when the sum of all liquid level values ​​is greater than the preset value, the water supply assembly decreases the first flow rate.

5. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 3 or 4, characterized in that, The side wall of the water distribution tank is equipped with guide elements, and multiple guide elements are evenly distributed along the length of the water distribution tank.

6. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 5, characterized in that, It also includes a fan located on one side of the transformer, which is used to blow air horizontally between two adjacent heat sinks.

7. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 6, characterized in that, In the same water distribution tank, all the guide components are composed of a first part and a second part. The first part of the guide component is located at the end of the water distribution tank away from the fan, and the length direction of the first part of the guide component is vertically arranged. The second part of the guide component is located at the end of the water distribution tank closer to the fan, and the length direction of the second part of the guide component forms a first angle with the vertical plane. In all the water distribution channels of the upper water distributor, the first distance gradually decreases; in all the water distribution channels of the lower water distributor, the second distance gradually decreases; in the same water distributor, the length direction of the second part of the guide member of the uppermost water distribution channel gradually approaches the fan from top to bottom, and the length direction of the second part of the guide member of the other water distribution channels gradually moves away from the fan from top to bottom, and the first included angle gradually decreases from top to bottom.

8. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 7, characterized in that, The first included angle of the second part of the guide component in the same water distribution tank gradually decreases from near to far from the fan.

9. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 2, characterized in that, The width of the overflow port gradually increases from bottom to top.

10. The liquid-cooled circulating power grid transformer heat dissipation mechanism according to claim 2, characterized in that, In the same water distribution tank, multiple overflow pipes are evenly distributed along the length of the water distribution tank.

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