Integral blade type oil-immersed transformer and temperature control method

Abstract

According to the integral blade type oil-immersed transformer and the temperature control method, a plurality of propeller type rotating blades with the outer diameter not smaller than 1 / 2 of the minimum size of the cross section of the box body in the vertical direction are arranged in the transformer box body, and transformer oil is driven to form circulating oil flow during rotation; the turbulence effect in an oil cavity is enhanced through axial eddy generated by the large-size blades, oil products in different areas in the box body are promoted to integrally flow in a turbulent mode, the heat exchange and soaking process of upper and lower layers and high and low temperature areas is accelerated, and the heat dissipation efficiency is improved; and the defoaming rods are arranged between the adjacent propeller type rotating blades, and the defoaming vertical rods are densely and vertically arranged on the surfaces of the defoaming rods, so that bubbles generated at the rotating tails or edges of the blades can be broken, the bridging discharge risk caused by bubble aggregation in a high-voltage and high-magnetic-field environment is effectively eliminated, the burning accident of the transformer is avoided, and the operation safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to an integral blade-type oil-immersed transformer and a temperature control method. Background Art

[0002] Traditional oil-immersed transformer oil circulation relies primarily on natural convection caused by temperature differences in the oil flow, or forced oil circulation driven by a submersible oil pump. However, both methods have significant shortcomings. Natural convection, due to its weak driving force, results in poor cooling, which can lead to increased copper and iron losses in the transformer and reduced operating efficiency. Furthermore, insufficient heat dissipation requires increasing the size of the equipment and oil consumption, further increasing manufacturing costs and resource consumption. While forced oil circulation with a submersible oil pump significantly improves cooling efficiency, its fixed and typically high operating speed creates excessive oil pressure and velocity, which can easily cause air bubbles to be drawn into the transformer oil, leading to bridging discharges, insulation breakdown, or burnout, threatening operational reliability. Furthermore, traditional oil circulation methods struggle to address uneven heat distribution within the enclosure, dead zones, and impurity deposits in the oil. When the transformer is subjected to vibration or maintenance disturbances, these deposits can re-enter the oil flow, contaminating the insulating oil and causing winding insulation degradation or lead connector failure. Some improvement plans use micro-pipes to connect different areas of the box to promote oil flow exchange, but it is still difficult to achieve rapid and uniform distribution of heat inside the box, and local overheating may still occur.

[0003] Traditional oil circulation methods have significant shortcomings in cooling efficiency, flow uniformity and bubble suppression. There is an urgent need for a new technology that takes into account efficient heat dissipation, flow uniformity and bubble control to improve the safety and economy of transformer operation. Summary of the Invention

[0004] The present invention aims to solve the problems of insufficient oil circulation, poor heat dissipation and difficulty in adapting to high-temperature environments in traditional oil-immersed transformers, and adopts an integrated blade-type oil circulation and bubble suppression collaborative design scheme. A plurality of large-sized propeller-type rotating blades with an outer diameter not less than 1 / 2 of the minimum dimension of the vertical cross-section of the transformer are arranged inside the transformer box. When the blades rotate, the transformer oil is driven to form a vertical circulating oil flow. The circumferential vortex generated by the large-sized blades is used to enhance the turbulence effect in the oil cavity, promote the overall turbulent flow of oil products in different areas of the box, accelerate the heat exchange and heat equalization process, and significantly improve the heat dissipation efficiency; at the same time, defoaming rods are arranged between adjacent propeller-type rotating blades, and the surface of the defoaming rods is densely arranged with vertical defoaming rods, which can effectively break up the bubbles generated at the tail or edge of the rotating blade, eliminate the risk of bridging discharge caused by bubble aggregation in high voltage and high magnetic field environments, avoid transformer burning accidents, ensure operation safety, and achieve a coordinated improvement of efficient heat dissipation and operation reliability. The technical solutions provided by this application are as follows: In one aspect, the present application provides an integral blade-type oil-immersed transformer, comprising: The box body has an oil cavity formed therein for containing transformer oil; A plurality of propeller-type rotating blades are provided in the housing, with an outer diameter not less than 1 / 2 of the minimum dimension of the vertical cross section of the housing, and are used to drive the transformer oil to form a vertical circulating oil flow in the oil cavity; The defoaming rod is arranged between two adjacent propeller-type rotating blades, and its surface is densely arranged with vertical defoaming vertical rods, which are used to break and eliminate bubbles generated at the tail or blade edge due to the rotation of the propeller-type rotating blade.

[0005] In an exemplary embodiment, the ratio of the length of the defoaming rod to the outer diameter of the propeller-type rotating blade is 1.05-1.4:1.

[0006] In an exemplary embodiment, a laminar flow baffle is provided at the bottom of the box body, a preset distance is maintained between the laminar flow baffle and the bottom surface of the box body to form a flow guide gap, and a plurality of through holes are provided through the surface of the laminar flow baffle.

[0007] In an exemplary embodiment, it further includes a diverter plate, an oblique guide plate, a solid baffle plate and a collection tank; wherein: The diverter plate is horizontally arranged below the laminar flow baffle plate, with a preset distance between the diverter plate and the laminar flow baffle plate, and a filter structure is provided at the junction of the plate surface with the oblique guide plate and the corresponding part of the collection tank; The solid baffle is arranged below the filter structure to block the oil flow; One end of the oblique guide plate is fixedly connected to the diverter plate, and the other end extends obliquely upward along the laminar flow baffle plate, for guiding the transformer oil to flow obliquely upward along its surface; The collecting tank is arranged below the diverter plate, and the top opening thereof is used for collecting impurities.

[0008] In an exemplary embodiment, it further includes an expandable body and an anti-dead angle baffle. The expandable body is arranged at the bottom corner area of ​​the box body, is made of rubber material, is connected to the gas refrigeration cycle system, and is controllably expanded by introducing SF6 gas; The anti-dead angle baffle is arranged above the expandable body, and a plurality of discharge holes are provided on the surface of the plate body for guiding the transformer oil accumulated at the bottom of the box to be discharged in a directional manner and enter the circulating oil flow when the expandable body expands.

[0009] In an exemplary embodiment, an arc-shaped guide plate is provided at the top corner area of ​​the box body facing away from the expandable body, and a surface of the arc-shaped guide plate close to the propeller-type rotating blade is provided with a trumpet-shaped guide ridge expanding outward along the direction of oil flow.

[0010] In an exemplary embodiment, the length of the diverter plate along the length direction of the laminar flow baffle is no more than one quarter of the total length of the laminar flow baffle.

[0011] In an exemplary embodiment, the tail portion of the laminar flow baffle is arranged to be tilted upward along the oil flow direction, and a trumpet-shaped flow guide ridge expanding outward along the flow direction is provided on the upper surface of the laminar flow baffle.

[0012] In an exemplary embodiment, the longitudinal section of the through hole is in the shape of an inverted trapezoid or an inverted cone, and the diameter of the upper opening is larger than the diameter of the lower opening.

[0013] On the other hand, the present application also provides a temperature control method for an integral blade-type oil-immersed transformer, comprising the following steps: Real-time monitoring of transformer oil temperature and ambient temperature; Dynamically adjust the motor speed based on the preset transformer oil temperature, the real-time monitored transformer oil temperature and the ambient temperature, wherein the preset transformer oil temperature is divided into three levels: the first level is 20°C ≤ T < 60°C, the second level is 60°C ≤ T < 65°C, and the third level is T ≥ 65°C; When the real-time monitored transformer oil temperature reaches the third level or the ambient temperature exceeds a preset ambient temperature threshold, the solar-powered drive motor is started, and the propeller-type rotating blades are controlled to operate at a speed higher than a preset speed reference value; When the transformer oil temperature is monitored in real time and is within the first and second ranges, the solar-powered drive motor is started, and the speed of the propeller-type rotating blade is controlled not to exceed the preset speed reference value; When the real-time monitored transformer oil temperature is lower than the first threshold or the solar energy storage is lower than the preset capacity threshold, it switches to passive cooling mode, and uses the expandable body to assist in heat dissipation of the corners of the box, while achieving circulating oil flow to suppress dead corner deposition.

[0014] By adopting the above technical solution, the present application provides an integral blade-type oil-immersed transformer and a temperature control method, which have the following beneficial effects: 1. By installing multiple large-sized propeller-type rotating blades with an outer diameter not less than 1 / 2 of the minimum vertical cross-section of the transformer box, the transformer oil is driven to form an efficient circulation flow inside the radiator and oil tank, significantly enhancing the turbulence effect in the oil cavity, promoting the overall circulation of the oil, accelerating the heat exchange and heat equalization process between the upper and lower layers and between high and low temperature areas, greatly improving the heat dissipation efficiency, effectively reducing the operating temperature of the transformer, and ensuring the safe and stable operation of the equipment; 2. The propeller-type rotating blades adopt an integral design and are directly built into the transformer box. The structure is simple and compact, with little impact on the overall size of the box. There is no need to significantly modify the original structure of the transformer. It can be directly applied to existing transformer equipment, with low modification cost and convenient implementation. 3. Defoaming rods are installed between adjacent propeller-type rotating blades. The surface of the defoaming rods is densely arranged with vertical defoaming rods, which can effectively break up the bubbles generated at the tail of the rotating blades, eliminate the risk of bubble bridging discharge in high voltage and high magnetic field environments caused by bubble accumulation during oil circulation, avoid insulation breakdown or burning accidents, and improve the safety of transformer operation; 4. Solar panels are used to power the propeller-type rotating blades, achieving energy self-sufficiency without the need for external power supply, reducing operating energy consumption and carbon emissions, complying with green environmental protection requirements, and improving the economy and sustainability of the system; 5. The motor speed is adjusted based on the internal temperature of the transformer and the ambient temperature feedback to achieve precise control under multi-level temperature differences. This can not only achieve more precise temperature regulation, but also promote oil self-cleaning, effectively prevent impurity deposition, extend the service life of the transformer, and improve operational reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 Schematic diagram of the integral blade type oil-immersed transformer provided in the embodiment of the present application Figure 1 ; Figure 2 Schematic diagram of the integral blade type oil-immersed transformer provided in the embodiment of the present application Figure 2 ; Figure 3 Schematic diagram of the integral blade type oil-immersed transformer provided in the embodiment of the present application Figure 3 ; Figure 4 Schematic diagram of the defoaming rod provided in an embodiment of the present application.

[0017] The following is a supplementary description of the accompanying drawings: 10-box; 101-collecting tank; 20-propeller-type rotating blade; 30-defoaming rod; 301-defoaming vertical rod; 40-laminar baffle; 401-through hole; 50-diverter plate; 60-oblique guide plate; 70-solid baffle; 80-expandable body; 90-anti-dead angle baffle; 901-discharge hole; 100-arc-shaped guide plate; 110-heat sink. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0019] References to "one embodiment" or "embodiment" herein refer to specific features, structures, or characteristics that may be included in at least one implementation of the present application. Throughout the description of this application, it should be understood that the terms "upper," "lower," "top," and "bottom," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, the terms "first," "second," etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that such terms are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0020] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between a minimum of 1 and a maximum of 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0021] See also Figure 1-4 , an embodiment of the present application provides an integral blade-type oil-immersed transformer, comprising: The box body 10 has an oil cavity formed inside for accommodating transformer oil. The box body 10 is a sealed structure, and its inner wall is made of oil-resistant and corrosion-resistant materials to ensure the chemical stability and insulation performance of the transformer oil during long-term storage. An oil injection port is provided on the top of the box body 10 to facilitate the injection of new transformer oil and the replenishment of oil to the system. A pressure balancing valve is provided on the top side to maintain the pressure stability in the box body 10 and prevent overpressure or vacuum conditions from affecting the insulation performance; an oil discharge port is provided at the bottom of the box body 10 to facilitate the complete replacement and maintenance of the transformer oil; heat sinks 110 are symmetrically arranged on both sides of the outside of the box body 10. The heat sinks 110 are made of high thermal conductivity aluminum alloy material, and the surface is anodized to enhance the radiation heat dissipation capacity. In order to promote the heat dissipation of the heat sink, the heat dissipation cooling process can be accelerated by setting blades to increase air flow.

[0022] Multiple propeller-type rotating blades 20 are disposed within the housing 10, with an outer diameter no less than half the minimum vertical cross-sectional dimension of the housing 10. These blades are used to drive the transformer oil to form a circulating oil flow within the oil cavity. The propeller-type rotating blades 20 are made of high-strength, corrosion-resistant, insulating materials, and their blade shape is optimized through fluid dynamics to generate greater thrust at relatively low rotational speeds. The propeller-type rotating blades 20 form a circulating oil flow within the transformer oil cavity, ensuring a turbulent heat dissipation cycle. The integrated design of the propeller-type rotating blades 20 achieves overall turbulent flow of the oil within the housing 10, rapidly achieving oil exchange and heat equalization between different areas (including upper and lower layers, high-heat areas, and low-heat areas). This promotes the oil to flow out of the radiator after sufficient heat equalization, carrying heat with it and improving heat dissipation efficiency. The propeller-type rotating blades 20 are connected to the drive device via a drive shaft and automatically adjust their rotational speed based on the internal temperature of the transformer.

[0023] The defoaming rod 30 is positioned between two adjacent propeller-type rotating blades 20. Its surface is densely packed with vertical defoaming rods 301, which are used to break up and eliminate bubbles generated at the tail or blade edges of the rotating propeller-type rotating blades 20. The defoaming rods 30 are made of insulating material to avoid affecting the electric field distribution within the transformer. The gaps between the defoaming rods 301 are optimized to effectively break up bubbles without affecting the overall flow of oil. Since the integrated propeller-type rotating blades 20 are large, bubbles are more likely to form at the tail of the rotational direction during rotation over a large area. Therefore, the defoaming rods 30 can provide a secondary auxiliary function to increase turbulent flow. The closely spaced defoaming rods 301 break up and eliminate bubbles flowing at the tail of the blades in the turbulent path after passing through the gaps between the rods. This prevents bubble accumulation during oil circulation and prevents these bubbles from causing bubble bridging discharge failures in the high voltage and high magnetic field environment of the main transformer. This avoids the risk of serious accidents such as insulation breakdown or even burning the main transformer, significantly improving the safety and reliability of transformer operation.

[0024] In an exemplary embodiment, the ratio of the length of the defoaming rod 30 to the outer diameter of the propeller-type rotating blade 20 is 1.05-1.4:1. By optimizing the outer diameters of the defoaming rod 30 and the propeller-type rotating blade 20, the vertical rod coverage range exceeds the blade diameter range, which can effectively act on the weak oil flow area caused by the blade, enhancing the oil flow disturbance and circulation effect in this area; at the same time, the extended design of the defoaming rod 30 enables it to extend to the outer area of ​​the blade. Here, the centrifugal force generated by the rotation of the blade causes the oil flow rate to drop sharply, which is a high-risk area for bubbles to accumulate. The longer diameter coverage of the defoaming rod 30 can improve the disturbance ability of the low-speed oil flow, break up the bubbles that are about to form, and greatly suppress the generation of bubbles, thereby effectively eliminating the risk of bubble bridging discharge in high voltage and high magnetic field environments, avoiding serious accidents such as insulation breakdown or even burning of the main transformer, and improving the safety and reliability of transformer operation.

[0025] In an exemplary embodiment, see Figure 2 A laminar flow baffle 40 is provided at the bottom of the housing 10. A predetermined distance is maintained between the laminar flow baffle 40 and the bottom surface of the housing 10 to form a flow-guiding gap, and a plurality of through-holes 401 are provided through the surface of the laminar flow baffle 40. During transformer operation, various solid particles, including metal impurities, are easily deposited on the bottom of the housing 10. If the large circulating oil flow driven by the propeller-type rotating blades 20 directly contacts the bottom, these deposited impurities, especially larger impurities that are difficult to discharge, may be rolled up and carried to the upper area. As a result, fine impurities at the bottom of the main transformer will be suspended in the circulating oil flow and impact key components such as the windings and the main transformer internal lead connectors, potentially causing insulation degradation or even short-circuit failure. To this end, the present application sets a laminar flow baffle 40 at the bottom of the box body 10, and a plurality of through holes 401 are set through the surface of the plate body; the laminar flow baffle 40 effectively blocks the direct contact between the oil flow and the bottom sediment, preventing impurities from being drawn into the circulating oil flow; and the through hole 401 design ensures that when the blades are not rotating, the oil can still pass through the through hole 401 to achieve a self-purification process of downward sedimentation, thereby maintaining the cleanliness of the oil; at the same time, a preset distance is maintained between the laminar flow baffle 40 and the bottom surface of the box body 10, preferably 1-10 cm, preferably 1-4 cm, which can effectively balance the oil flow resistance and the impurity blocking effect, and can ensure that the oil flow passes through the guide gap smoothly at a low speed, avoiding excessive pressure loss or impurity accumulation and blockage due to a too small gap, and prevents the oil flow from directly impacting the bottom sediment due to a too large gap, and can also allow the clean oil to smoothly settle downward through the through hole 401 to achieve self-cleaning, while maintaining good thermal conductivity at the bottom of the box body 10.

[0026] In an exemplary embodiment, please refer to Figure 2 , further comprising a diverter plate 50, an oblique guide plate 60, a solid baffle 70 and a collecting tank 101; wherein: The diverter plate 50 is horizontally arranged below the laminar flow baffle plate 40, with a preset distance between the diverter plate 50 and the laminar flow baffle plate 40. A filter structure is provided at the junction of the diverter plate surface with the oblique guide plate 60 and the corresponding portion of the collecting tank 101. A solid baffle 70 is provided below the filter structure to block the oil flow; One end of the oblique guide plate 60 is fixedly connected to the diverter plate 50, and the other end extends obliquely upward along the laminar flow baffle 40, for guiding the transformer oil to flow obliquely upward along its surface; The collecting tank 101 is disposed below the diverter plate 50 , and its top is open for collecting impurities.

[0027] Specifically, a horizontal diverter plate 50 is positioned below the laminar flow baffle 40. The front portion of its surface is unfiltered for drainage, while the intersection with the oblique guide plate 60 incorporates a filter structure for filtering impurities. After the oil flows through, it enters the oil circulation system upward. The oblique guide plate 60 guides the transformer oil along the inclined surface, allowing the oil at the bottom, which contains a high concentration of metallic impurities, to be separated by the airflow driven by the propeller-type rotating blades 20 through the diverter plate 50. The lighter oil is filtered through the filter structure and enters the circulation system, while the heavier metallic impurities are intercepted by the filter and gradually deposited in the collection tank 101 below. When impurities accumulate to a certain amount, they can be discharged through a control valve at the bottom of the housing 10, thereby completing continuous impurity purification during the oil circulation process. This not only achieves impurity purification in the oil circulation system, but also solves the problem of difficult purification of oil with high impurities at the bottom, thereby improving the overall filtration effect.

[0028] In an exemplary embodiment, please refer to Figure 2 , also includes an expandable body 80 and an anti-dead corner baffle 90. The expandable body 80 is arranged in the bottom corner area of ​​the box body 10, is made of rubber material, and is connected to the gas refrigeration cycle system. It realizes controllable expansion by introducing SF6 gas. By arranging the expandable body 80 made of rubber material in the bottom corner area of ​​the box body 10 and connecting it to the SF6 gas refrigeration cycle system. By introducing SF6 (sulfur hexafluoride) gas into the expandable body 80, it can realize controllable expansion and realize auxiliary cooling of the dead corner area of ​​the box body 10. The expanded expandable body 80 can discharge the transformer oil originally retained in the dead corner area, so that it can be re-merged into the main oil flow circulation of the box body 10, thereby improving the cooling efficiency and avoiding local overheating.

[0029] A blind spot prevention baffle 90 is positioned above the expandable body 80. Its surface is perforated with multiple drainage holes 901. These holes are used to guide any transformer oil stagnating at the bottom of the tank 10 outwards and into the circulating oil flow when the expandable body 80 expands. The blind spot prevention baffle 90, positioned above the expandable body 80, consists of overlapping baffles with spaces between adjacent baffles. Multiple drainage holes 901 are perforated throughout the baffle. The blind spot prevention baffle 90 also serves as a flow diversion mechanism, guiding the oil flow into a continuous circulation system. During operation, impurities in the transformer oil tend to settle at the bottom of the tank 10, and part of the oil (especially the part containing impurities) will be temporarily stored in the dead zone (corner of the tank) through the baffle interval; when the expandable body 80 at the corner expands, the expandable body 80 pushes the stagnant oil at the bottom of the tank corner, so that the oil that originally entered the dead zone through the interval is discharged through the discharge hole 901 to the bottom of the laminar flow baffle 40, and re-merges into the main oil flow circulation of the tank 10, thereby realizing the directional discharge and recycling of oil and impurities in the dead corner area.

[0030] In an exemplary embodiment, an arc-shaped guide plate 100 is provided at the top corner area of ​​the housing 10 on the side facing away from the expandable body 80, and a bell-shaped guide ridge that expands outward along the direction of the oil flow is provided on the surface of the arc-shaped guide plate 100 on the side close to the propeller-type rotating blade 20. By providing an arc-shaped guide plate 100 at the top corner area of ​​the housing 10 on the side facing away from the expandable body 80, and a bell-shaped guide ridge that expands outward along the direction of the oil flow on the surface close to the propeller-type rotating blade 20, the arc-shaped guide plate 100 adapts the oil flow direction to the rotational motion of the propeller-type rotating blade 20 through the guiding effect of the bell-shaped guide ridge, thereby improving the overall oil flow circulation efficiency; at the same time, the guide ridge can enhance the scouring effect on the wall of the housing 10 under the impact of the oil flow, effectively reducing the deposition of oil stains on the wall.

[0031] In an exemplary embodiment, the length of the diverter plate 50 along the length of the laminar flow baffle 40 is no greater than one-quarter of the total length of the laminar flow baffle 40. By limiting the coverage of the diverter plate 50, the upper oil product is ensured not to be excessively blocked during circulation, thereby preventing the normal deposition and circulation of the upper oil product from being affected, and maintaining oil stratification and circulation efficiency.

[0032] In one exemplary embodiment, the tail portion of the laminar flow baffle 40 is tilted upward along the direction of oil flow, and its upper surface is provided with a bell-shaped flow-guiding ridge that expands outward in the direction of flow. This fluid dynamics design increases the velocity gradient of the oil as it flows through the tail portion, thereby enhancing the relative motion of the oil flow and the wall of the casing 10. This enhanced shearing effect effectively inhibits the retention and deposition of oil and impurities on the wall, reducing the risk of oil contamination caused by contaminant accumulation on the wall. It also improves the self-cleaning efficiency of the inner wall of the casing 10, ensuring the cleanliness of the oil circulation system.

[0033] In one exemplary embodiment, the longitudinal cross-section of through-hole 401 is in the shape of an inverted trapezoid or inverted cone, with the upper opening diameter being larger than the lower opening diameter. When oil flows through through-hole 401, the larger upper opening area reduces oil flow resistance, facilitating smooth downward flow of the oil. The gradually tapering opening creates a physical barrier, increasing the chance of impurities being deposited downward. Even if tiny particles travel with the oil flow to the through-hole 401 area, they are effectively intercepted due to the reduced cross-sectional area. Furthermore, this structure effectively inhibits the possibility of reverse flow of oil from the lower portion toward the upper region due to pressure fluctuations or local turbulence, fundamentally reducing the risk of impurities circulating with the oil flow and entering the critical upper region. The gradual transition from inverted cone or inverted trapezoid also avoids stress concentration, improves structural strength, and ensures that the shape of through-hole 401 remains stable during long-term transformer operation, continuously performing its dual functions of impurity filtration and oil flow guidance, thereby enhancing transformer oil cleanliness and operational reliability.

[0034] On the other hand, an embodiment of the present application further provides a temperature control method for an integral blade-type oil-immersed transformer, comprising the following steps: Real-time monitoring of transformer oil temperature and ambient temperature; The motor speed is dynamically adjusted based on the preset transformer oil temperature, real-time monitoring of the transformer oil temperature, and ambient temperature. The preset transformer oil temperature is divided into three levels: the first level is 20℃≤T<60℃, the second level is 60℃≤T<65℃, and the third level is T≥65℃; When the real-time monitored transformer oil temperature reaches the third level or the ambient temperature exceeds a preset ambient temperature threshold, the solar-powered drive motor is started and the propeller-type rotating blades 20 are controlled to operate at a speed higher than a preset speed reference value; When the transformer oil temperature is monitored in real time and is within the first and second ranges, the solar powered drive motor is started, and the speed of the propeller-type rotating blades 20 is controlled not to exceed a preset speed reference value; When the real-time monitored transformer oil temperature is lower than the first threshold or the solar energy storage is lower than the preset capacity threshold, it switches to passive cooling mode, and the expandable body 80 is used to assist in heat dissipation of the corners of the box 10, while circulating oil flow is achieved to suppress dead corner deposition.

[0035] Specifically, the temperature control method of the integral blade-type oil-immersed transformer adopts a multi-stage dynamic adjustment mechanism to achieve precise temperature control and system self-cleaning. The system monitors the transformer oil temperature and ambient temperature in real time and dynamically adjusts the motor speed based on three preset temperature thresholds (first: 20°C ≤ T < 60°C, second: 60°C ≤ T < 65°C, and third: T ≥ 65°C). When the real-time monitored transformer oil temperature reaches the third threshold (T ≥ 65°C) or the ambient temperature exceeds 40°C, the system automatically switches to solar power supply mode and drives the propeller-type rotating blades 20 at a speed exceeding 1200 rpm to enhance the heat dissipation of the hot oil circulation. When the oil temperature difference is between the first and second thresholds, solar power is used but the blade speed is controlled to not exceed 1200 rpm to maintain high-efficiency and low-consumption operation. When the oil temperature difference is below 20°C or the solar energy storage capacity is less than 30% of the total capacity, passive cooling mode is activated. The expandable body 80 expands controllably at the corners of the box 10, pushing stagnant oil out of dead corners and into the main circulation, eliminating the risk of local overheating and using oil flow to flush out impurities on the wall. Specifically, when transformer oil temperature rises sharply (T ≥ 65°C), the ambient temperature is extremely high (strong sunlight causing the ambient temperature to exceed 40°C), or the equipment experiences abnormal temperature rise, solar energy storage is prioritized to drive high-speed blades to improve heat dissipation efficiency. In contrast, when the temperature difference is large but the environment is mild (20°C ≤ T < 60°C and insufficient sunlight), or when the equipment experiences occasional abnormal temperature rise, solar energy storage is used to maintain the blades' normal speed. This solution combines active forced circulation with passive auxiliary cooling, combined with multi-level temperature threshold judgment and energy management, to achieve precise temperature control under all operating conditions. It also utilizes oil circulation to flush out deposits inside the box 10, effectively improving oil cleanliness and equipment life.

[0036] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An integral blade type oil-immersed transformer, characterized in that: include: A box (10) having an oil cavity formed therein for containing transformer oil; A plurality of propeller-type rotating blades (20) are provided in the housing (10), the outer diameter of which is not less than 1 / 2 of the minimum dimension of the vertical cross section of the housing (10), and is used to drive the transformer oil to form a vertical circulating oil flow in the oil cavity; The defoaming rod (30) is arranged between two adjacent propeller-type rotating blades (20), and has a surface densely arranged vertical defoaming vertical rods (301) for breaking up and eliminating bubbles generated at the tail or blade edge due to the rotation of the propeller-type rotating blade (20).

2. The integral blade type oil-immersed transformer according to claim 1, characterized in that: The ratio of the length of the defoaming rod (30) to the outer diameter of the propeller-type rotating blade (20) is 1.05-1.4:

1.

3. The integral blade type oil-immersed transformer according to claim 1, characterized in that: A laminar flow baffle (40) is provided at the bottom of the box body (10), a preset distance is maintained between the laminar flow baffle (40) and the bottom surface of the box body (10) to form a flow guide gap, and a plurality of through holes (401) are provided through the surface of the laminar flow baffle (40).

4. The integral blade type oil-immersed transformer according to claim 3, characterized in that: It also includes a diverter plate (50), an oblique guide plate (60), a solid baffle (70) and a collection tank (101); wherein: The diverter plate (50) is horizontally arranged below the laminar flow baffle plate (40), with a preset distance between the diverter plate (50) and the laminar flow baffle plate (40), and a filter structure is provided at the junction of the plate surface and the oblique guide plate (60) and the corresponding portion of the collecting tank (101); The solid baffle (70) is arranged below the filter structure and is used to block the oil flow; One end of the oblique guide plate (60) is fixedly connected to the diverter plate (50), and the other end extends obliquely upward along the laminar flow baffle plate (40) to guide the transformer oil to flow obliquely upward along its surface; The collecting tank (101) is arranged below the diverter plate (50), and its top opening is used for collecting impurities.

5. The integral blade type oil-immersed transformer according to claim 1, characterized in that: It also includes an expandable body (80) and an anti-dead angle baffle (90), wherein the expandable body (80) is arranged at the bottom corner area of ​​the box body (10), is made of rubber material, is connected to the gas refrigeration cycle system, and achieves controllable expansion by introducing SF6 gas; The anti-dead angle baffle (90) is arranged above the expandable body (80), and a plurality of discharge holes (901) are provided through the surface of the plate body, for guiding the transformer oil accumulated at the bottom of the box (10) to be discharged in a directional manner and enter the circulating oil flow when the expandable body (80) expands.

6. The integral blade type oil-immersed transformer according to claim 5, characterized in that: An arc-shaped guide plate (100) is provided at a top corner area of ​​the box body (10) on a side facing away from the expandable body (80), and a surface of the arc-shaped guide plate (100) on a side close to the propeller-type rotating blade (20) is provided with a trumpet-shaped guide ridge that expands outward along the direction of oil flow.

7. The integral blade type oil-immersed transformer according to claim 4, characterized in that: The length of the diverter plate (50) along the length direction of the laminar flow baffle plate (40) is no more than one quarter of the total length of the laminar flow baffle plate (40).

8. The integral blade type oil-immersed transformer according to claim 4, characterized in that: The tail of the laminar flow baffle (40) is arranged to tilt upwards along the oil flow direction, and its upper surface is provided with a trumpet-shaped flow guide ridge that expands outwards along the flow direction.

9. The integral blade type oil-immersed transformer according to claim 3, characterized in that: The longitudinal section of the through hole (401) is in the shape of an inverted trapezoid or an inverted cone, and the diameter of the upper opening is larger than the diameter of the lower opening.

10. The temperature control method of the integral blade type oil-immersed transformer according to any one of claims 1 to 9, characterized in that: The following steps are involved: Real-time monitoring of transformer oil temperature and ambient temperature; Dynamically adjust the motor speed based on the preset transformer oil temperature, the real-time monitored transformer oil temperature and the ambient temperature, wherein the preset transformer oil temperature is divided into three levels: the first level is 20°C ≤ T < 60°C, the second level is 60°C ≤ T < 65°C, and the third level is T ≥ 65°C; When the real-time monitored transformer oil temperature reaches the third level or the ambient temperature exceeds a preset ambient temperature threshold, the solar-powered drive motor is started, and the propeller-type rotating blades are controlled to operate at a speed higher than a preset speed reference value; When the transformer oil temperature is monitored in real time and is within the first and second ranges, the solar-powered drive motor is started, and the speed of the propeller-type rotating blade is controlled not to exceed the preset speed reference value; When the real-time monitored transformer oil temperature is lower than the first threshold or the solar energy storage is lower than the preset capacity threshold, it switches to passive cooling mode, and uses the expandable body to assist in heat dissipation of the corners of the box, while achieving circulating oil flow to suppress dead corner deposition.

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