Integral blade type oil-immersed transformer and temperature control method

Abstract

The application provides an integrated blade type oil-immersed transformer and a temperature control method, a plurality of propeller type rotating blades with an outer diameter not less than 1 / 2 of the minimum size of a vertical cross section of a transformer tank are arranged in the transformer tank, circulating oil flow is formed by driving transformer oil when the rotating blades rotate, axial vortex generated by the large size blades enhances the turbulent effect in the oil cavity, the overall turbulent flow of oil in different areas in the tank is promoted, the heat exchange and heat equalization process between upper and lower layers and high and low temperature areas are accelerated, and the heat dissipation efficiency is improved; and a defoaming rod is arranged between adjacent propeller type rotating blades, a plurality of vertical defoaming rods are densely arranged on the surface of the defoaming rod, the bubbles generated at the tail or edge of the rotating blades can be broken, the risk of bridge discharge caused by bubble aggregation in a high-voltage and high-magnetic-field environment is effectively eliminated, transformer burning accidents are avoided, and operation safety is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to a whole type of blade oil-immersed transformer and a temperature control method. BACKGROUND

[0002] The oil flow circulation mode of the traditional oil-immersed transformer mainly relies on the cold and hot natural convection formed by the temperature difference of the oil flow or the strong oil circulation driven by the submersible pump. However, both of the two modes have significant deficiencies. The cold and hot natural convection has weak driving force of the oil flow, poor cooling effect, and is easy to cause the increase of the copper and iron loss of the transformer and the decrease of the operation efficiency. It also needs to increase the size of the equipment and the amount of oil to compensate for the insufficient heat dissipation, which further increases the manufacturing cost and resource consumption. Although the strong oil circulation of the submersible pump can significantly improve the cooling efficiency, the operation speed is fixed and usually high, the oil flow pressure and flow rate are too large, which is easy to make the transformer oil roll into the air to form bubbles, and then cause the bridging discharge, insulation breakdown or burning accident, threatening the operation reliability. In addition, the traditional oil flow circulation mode is difficult to solve the problems of uneven heat distribution, flow dead zone and impurity deposition in the tank. When the transformer is subjected to vibration or maintenance disturbance, the deposited impurities may re-mix into the oil flow to pollute the insulating oil, causing the deterioration of the winding insulation or the lead joint failure. Some improved schemes use micro-pipes to connect different areas of the tank to promote oil flow exchange, but it is still difficult to achieve rapid and uniform distribution of heat in the tank, and local overheating phenomenon may still occur.

[0003] The traditional oil flow circulation mode has significant deficiencies in cooling efficiency, flow uniformity and bubble suppression, and a new technology that takes into account efficient heat dissipation, flow distribution and bubble control is needed to improve the safety and economy of the transformer operation. SUMMARY

[0004] The present application adopts a whole type of blade oil flow circulation and bubble suppression collaborative design scheme to solve the problems of insufficient oil flow circulation, poor heat dissipation effect and difficulty in adapting to high temperature environment of the traditional oil-immersed transformer. A plurality of large-size propeller rotating blades with an outer diameter not less than 1 / 2 of the minimum size of the vertical cross section of the tank are arranged in the tank of the transformer. The blades drive the transformer oil to form a vertical circulating oil flow when rotating. The circumferential vortex generated by the large-size blades enhances the turbulent effect in the oil cavity, promotes the overall turbulent flow of the oil in different areas of the tank, accelerates the heat exchange and heat distribution process, and significantly improves the heat dissipation efficiency. At the same time, a defoaming rod is arranged between adjacent propeller rotating blades, and vertical defoaming vertical rods are densely arranged on the surface of the defoaming rod. The bubbles generated at the tail or edge of the blade rotation can be effectively broken, and the risk of bridging discharge caused by bubble aggregation in the high-voltage and high-magnetic-field environment can be eliminated to avoid transformer burning accidents and ensure the operation safety, realizing the collaborative improvement of efficient heat dissipation and operation reliability. The technical scheme provided in the present application is as follows:

[0005] In one aspect, the present application provides a whole-body blade type oil-immersed transformer, comprising:

[0006] a box body, an oil cavity for containing transformer oil is formed inside;

[0007] a plurality of propeller type rotating blades are arranged in the box body, the outer diameter of which is not less than 1 / 2 of the minimum size of the vertical cross section of the box body, for driving the transformer oil to form a vertical circulating oil flow in the oil cavity;

[0008] a defoaming rod is arranged between two adjacent propeller type rotating blades, the surface of which is densely arranged with vertical defoaming vertical rods, for breaking and eliminating the bubbles generated at the tail or edge of the propeller type rotating blades due to rotation.

[0009] In one exemplary embodiment, the length of the defoaming rod is 1.05-1.4:1 of the outer diameter of the propeller type rotating blade.

[0010] In one exemplary embodiment, a laminar flow barrier plate is arranged at the bottom of the box body, a predetermined gap is maintained between the laminar flow barrier plate and the bottom surface of the box body to form a flow guiding gap, and a plurality of through holes are arranged through the surface of the laminar flow barrier plate.

[0011] In one exemplary embodiment, it further comprises a flow distribution plate, an inclined flow guide plate, a solid baffle and a collection tank; wherein:

[0012] the flow distribution plate is horizontally arranged below the laminar flow barrier plate, a predetermined gap is arranged between the flow distribution plate and the laminar flow barrier plate, and a filter screen structure is arranged at the junction between the surface of the flow distribution plate and the inclined flow guide plate corresponding to the collection tank;

[0013] the solid baffle is arranged below the filter screen structure for blocking the oil flow;

[0014] one end of the inclined flow guide plate is fixedly connected with the flow distribution plate, and the other end extends upwardly along the laminar flow barrier plate for guiding the transformer oil to flow upwardly along the surface of the inclined flow guide plate;

[0015] the collection tank is arranged below the flow distribution plate, and the top opening of the collection tank is used for collecting impurities.

[0016] In one exemplary embodiment, it further comprises an inflatable body and a dead angle prevention baffle, the inflatable body is arranged at the corner area of the bottom of the box body, is made of rubber material, is communicated with a gas refrigeration cycle system, and is inflatable by inputting SF6 gas;

[0017] The dead corner preventing baffle is arranged above the inflatable body, and a plurality of discharge holes are arranged through the surface of the baffle body, which are used for guiding the transformer oil accumulated at the bottom of the tank to be discharged and enter the circulating oil flow when the inflatable body is inflated.

[0018] In an exemplary embodiment, an arc-shaped guide plate is arranged at the top corner region of the side of the tank away from the inflatable body, and a horn-shaped guide ridge is arranged on the surface of the side of the arc-shaped guide plate close to the propeller rotating blade and expands outward along the oil flow direction.

[0019] In an exemplary embodiment, the length of the shunt plate arranged along the length direction of the laminar flow barrier plate is not greater than one fourth of the total length of the laminar flow barrier plate.

[0020] In an exemplary embodiment, the tail part of the laminar flow barrier plate is arranged to be inclined upward along the oil flow direction, and a horn-shaped guide ridge is arranged on the upper surface of the tail part and expands outward along the flow direction.

[0021] In an exemplary embodiment, the longitudinal section of the through hole is in an inverted trapezoidal or inverted conical shape, and the opening diameter at the upper end is greater than the opening diameter at the lower end.

[0022] In another aspect, the application also provides a whole-body blade type oil-immersed transformer temperature control method, comprising the following steps:

[0023] Real-time monitoring of transformer oil temperature and environmental temperature;

[0024] Dynamic adjustment of motor speed based on preset transformer oil temperature, real-time monitoring of transformer oil temperature, and environmental temperature, wherein the preset transformer oil temperature is divided into three grades: the first grade is 20℃≤T<60℃, the second grade is 60℃≤T<65℃, and the third grade is T≥65℃;

[0025] When the real-time monitoring of transformer oil temperature reaches the third grade or the environmental temperature exceeds the preset environmental temperature threshold value, the solar power driven motor is started, and the propeller rotating blade is controlled to operate at a speed higher than the preset speed reference value;

[0026] When the real-time monitoring of transformer oil temperature is in the range of the first grade and the second grade, the solar power driven motor is started, and the speed of the propeller rotating blade is controlled to be not more than the preset speed reference value;

[0027] When the real-time monitoring of transformer oil temperature is lower than the threshold value of the first grade or the solar energy storage is lower than the preset capacity threshold value, the passive cooling mode is switched to, the inflatable body is used to assist heat dissipation of the corner of the tank, and the circulating oil flow is realized to suppress the dead angle deposition.

[0028] With the technical scheme, the whole blade type oil-immersed transformer and the temperature control method have the following beneficial effects:

[0029] 1. By arranging a plurality of large-size propeller type rotating blades with an outer diameter not less than 1 / 2 of the minimum size of the vertical cross section of the transformer tank inside the transformer tank, high-efficiency circulating flow of the transformer oil is formed inside the radiator and the oil tank, the turbulent effect in the oil cavity is significantly enhanced, the overall circulation of the oil is promoted, the heat exchange and heat equalization process between the upper and lower layers and the high and low temperature areas are accelerated, the heat dissipation efficiency is greatly improved, the transformer operating temperature is effectively reduced, and the safe and stable operation of the equipment is ensured.

[0030] 2. The propeller type rotating blades are designed in a whole body, are directly arranged inside the transformer tank, have a simple and compact structure, have little influence on the overall size of the tank, do not need to be greatly modified from the original structure of the transformer, can be directly applied to the existing transformer equipment, and are low in modification cost and convenient to implement.

[0031] 3. The defoaming rods are arranged between the adjacent propeller type rotating blades, vertical defoaming vertical rods are densely arranged on the surface of the defoaming rods, the bubbles generated at the tail of the rotating blades can be effectively broken, the risk of bubble bridging discharge in a high-voltage and high-magnetic-field environment caused by bubble aggregation in the oil flow circulation process is eliminated, insulation breakdown or burning accidents are avoided, and the operation safety of the transformer is improved.

[0032] 4. The propeller type rotating blades are powered by solar panels, energy self-sufficiency is realized, external power supply is not needed, operation energy consumption is reduced, carbon emission is reduced, green environmental protection requirements are met, and the economy and sustainability of the system are improved.

[0033] 5. The rotating speed of the motor is adjusted based on the feedback of the internal temperature of the transformer and the ambient temperature, precise control under multiple temperature differences is realized, more precise temperature regulation can be realized, the self-cleaning of the oil is promoted, impurity deposition is effectively prevented, the service life of the transformer is prolonged, and the operation reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0035] Figure 1 The schematic diagram of the whole blade type oil-immersed transformer provided by the embodiment of the present application Figure 1 ;

[0036] Figure 2 The schematic diagram of the whole blade type oil-immersed transformer provided by the embodiment of the present application Figure 2;

[0037] Figure 3 A schematic diagram of the integrated blade type oil-immersed transformer provided by the embodiment of the present application Figure 3 ;

[0038] Figure 4 A schematic diagram of the defoaming rod provided by the embodiment of the present application.

[0039] The following is a supplementary description of the drawings:

[0040] 10 - box; 101 - collection groove; 20 - propeller type rotating blade; 30 - defoaming rod; 301 - defoaming vertical rod; 40 - laminar flow barrier; 401 - through hole; 50 - flow divider; 60 - inclined guide vane; 70 - solid baffle; 80 - inflatable body; 90 - dead corner baffle; 901 - discharge hole; 100 - arc guide vane; 110 - heat sink. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] The term "one embodiment" or "an embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one implementation of the present application. In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0043] When a range of values is disclosed herein, the disclosure is to be understood to encompass each and every value within the range, including the minimum and maximum values, and including each integer and fraction within that range. Further, these disclosed ranges are to be construed as having a limit corresponding to the precision of the term. For example, a range of "1 to 10" is to be construed as indicating each and every integer between and including 1 and 10. An example of a range that is disclosed as "1 to 10" is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

[0044] Referring to Figures 1-4 The embodiment of the present application provides a whole type blade oil-immersed transformer, which comprises:

[0045] The box 10 is internally formed with an oil cavity for containing transformer oil. The box 10 is a sealed structure, and the inner wall thereof is made of oil-resistant and corrosion-resistant material, so as to ensure the chemical stability and insulation performance of the transformer oil during long-term storage. The box 10 is provided with an oil injection port at the top, so as to facilitate injection of new transformer oil and system oil supplement. A pressure balance valve is arranged on the side of the top of the box 10, so as to maintain the pressure in the box 10 stable and prevent overpressure or vacuum state from affecting the insulation performance. The box 10 is provided with an oil discharge port at the bottom, so as to facilitate complete replacement and maintenance emptying of the transformer oil. Radiating fins 110 are symmetrically arranged on the two sides of the box 10. The radiating fins 110 are made of high-thermal-conductivity aluminum alloy material, and the surface thereof is subjected to anodic oxidation treatment to enhance the radiation and heat dissipation capacity. In order to promote heat dissipation of the radiating fins, the heat dissipation and cooling process can be accelerated by means of increasing air flow through the arrangement of blades.

[0046] The propeller type rotating blades 20 are arranged in the box 10, and the outer diameter of the propeller type rotating blades 20 is not less than 1 / 2 of the minimum size of the vertical cross section of the box 10, so as to drive the transformer oil to form a circulating oil flow in the oil cavity. The propeller type rotating blades 20 are made of high-strength, corrosion-resistant and insulating material, and the blade shape thereof is subjected to fluid dynamics optimization design, so as to generate a large thrust at a low rotating speed. The propeller type rotating blades 20 form a circulating oil flow in the transformer oil cavity, so as to ensure a turbulent effect of heat dissipation circulation. Through the whole propeller type rotating blade 20 design, the whole turbulent flow of the oil in the box 10 is realized, so as to quickly realize oil exchange and heat equalization of different regions (including upper and lower layers, high-heat regions and low-heat regions), promote the oil carrying heat to flow out of the radiator after full heat equalization, and improve the heat dissipation efficiency. The propeller type rotating blades 20 are connected with the driving device through a transmission shaft, and the rotating speed thereof can be automatically adjusted according to the internal temperature of the transformer.

[0047] The defoaming rod 30 is arranged between two adjacent propeller rotating blades 20, and the surface of the defoaming rod 30 is densely arranged with vertical defoaming vertical rods 301 for breaking and eliminating the bubbles generated at the tail or the edge of the blade due to the rotation of the propeller rotating blade 20. The defoaming rod 30 is made of insulating material to avoid affecting the electric field distribution inside the transformer. The gap between the defoaming vertical rods 301 is designed to be optimized, which can effectively break the bubbles without affecting the overall flow of the oil flow. The integral propeller rotating blade 20 is prone to generate bubbles at the tail in the rotating direction during the rotation of a large area, and therefore the defoaming rod 30 can be arranged to assist in increasing the turbulent flow. The closely arranged defoaming vertical rods 301 break and eliminate the bubbles of the oil flow at the tail of the blade on the turbulent path after passing through the gap between the vertical rods, thereby avoiding the aggregation of bubbles in the oil flow circulation process and preventing the bubble bridging discharge fault caused by the bubbles in the high-voltage and high-magnetic-field environment in the transformer, avoiding the serious accident risk of insulation breakdown and even burning of the transformer, and significantly improving the safety and reliability of the transformer operation.

[0048] In an exemplary embodiment, the length of the defoaming rod 30 is 1.05-1.4:1 of the outer diameter of the propeller rotating blade 20. By optimizing the length of the defoaming rod 30 and the outer diameter of the propeller rotating blade 20, the vertical rod coverage range of the defoaming rod 30 exceeds the blade diameter range, which can effectively act on the weak area of the oil flow caused by the blade and enhance the oil flow disturbance and circulation effect in the area. At the same time, the lengthening design of the defoaming rod 30 enables it to extend to the peripheral area of the blade. 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 bubble aggregation. The longer diameter coverage range of the defoaming rod 30 can improve the disturbance ability of the low-speed oil flow, break the bubbles that are about to be formed, greatly inhibit the generation of bubbles, effectively eliminate the bubble bridging discharge risk in the high-voltage and high-magnetic-field environment, avoid the serious accident of insulation breakdown and even burning of the transformer, and improve the safety and reliability of the transformer operation.

[0049] In an exemplary embodiment, please refer to Figure 2A 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.

[0050] 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:

[0051] 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.

[0052] A solid baffle 70 is provided below the filter structure to block the oil flow;

[0053] One end of the oblique guide plate 60 is fixedly connected to the diverter plate 50, and the other end extends upward along the laminar flow baffle 40 to guide the transformer oil to flow upward along the surface thereof.

[0054] The collecting tank 101 is disposed below the diverter plate 50 , and its top is open for collecting impurities.

[0055] Specifically, by setting a horizontal flow distribution plate 50 below the laminar flow barrier plate 40, the front part of the surface of the flow distribution plate 50 is not provided with a filter screen for guiding the flow, and the junction with the inclined guide plate 60 is provided with a filter screen structure for filtering impurities, and the oil flow enters the oil flow circulation upward after passing through, and cooperates with the inclined guide plate 60 to guide the transformer oil to flow along the inclined surface, so that the oil product with more metal impurities at the bottom is separated by the flow distribution plate 50 under the action of the air flow driven by the propeller type rotating blade 20, and the lighter oil product enters the circulation system after being filtered by the filter screen structure, and the heavier metal impurities are intercepted by the filter screen and gradually deposited into the collection tank 101 below. When the impurities accumulate to a certain amount, they can be discharged through the control valve at the bottom of the box 10, so that the continuous purification of impurities is completed in the oil product circulation process. Not only the impurities in the oil product circulation are purified, but also the problem of difficult purification of the high-impurity oil product at the bottom is solved, and the overall filtering effect is improved.

[0056] In one exemplary embodiment, please continue to refer to Figure 2 It also includes an inflatable body 80 and a dead angle baffle 90. The inflatable body 80 is arranged at the corner area of the bottom of the box 10 and is made of rubber material and is connected with the SF6 gas refrigeration cycle system to achieve controllable inflation by introducing SF6 gas. The inflatable body 80 made of rubber material is arranged at the corner area of the bottom of the box 10 and is connected with the SF6 gas refrigeration cycle system. By introducing SF6 gas into the inflatable body 80, the inflatable body 80 can be inflated controllably, and the dead angle area of the box 10 can be cooled. The inflated inflatable body 80 can discharge the transformer oil originally accumulated in the dead angle area, so that the transformer oil is recombined into the main oil flow circulation of the box 10, the cooling efficiency is improved, and local overheating is avoided.

[0057] The dead angle baffle 90 is arranged above the inflatable body 80, and a plurality of discharge holes 901 are arranged on the surface of the baffle plate to guide the transformer oil accumulated at the bottom of the box 10 to be discharged and enter the circulating oil flow when the inflatable body 80 is inflated. The dead angle baffle 90 is composed of overlapping baffles, and a plurality of discharge holes 901 are arranged on the surface of the baffle plate. The dead angle baffle 90 has a flow guiding function and can guide the oil flow to form a whole circulation. During operation, impurities in the transformer oil are easy to deposit at the bottom of the box 10, and part of the oil product (especially the part containing impurities) will be temporarily stored in the dead zone (corner of the box) through the baffle interval; when the inflatable body 80 at the corner is inflated, the inflatable body 80 pushes the oil accumulated at the bottom of the corner of the box, so that the oil flow originally entering the dead zone through the interval is discharged through the discharge holes 901 and flows to the bottom of the laminar flow barrier plate 40, and recombines into the main oil flow circulation of the box 10, thereby realizing the directional discharge and recycling of the oil product and impurities in the dead angle area.

[0058] In an exemplary embodiment, the top corner area of the tank 10 on the side away from the inflatable body 80 is provided with an arc-shaped flow guide plate 100, and the side surface of the arc-shaped flow guide plate 100 close to the propeller-type rotating blade 20 is provided with a horn-shaped flow guide ridge extending outward along the oil flow direction. By providing the arc-shaped flow guide plate 100 on the top corner area of the tank 10 on the side away from the inflatable body 80, and the side surface of the arc-shaped flow guide plate 100 close to the propeller-type rotating blade 20 is provided with a horn-shaped flow guide ridge extending outward along the oil flow direction; the arc-shaped flow guide plate 100 guides the oil flow direction through the horn-shaped flow guide ridge to adapt to the rotating motion of the propeller-type rotating blade 20, thereby improving the overall oil flow circulation efficiency; at the same time, the flow guide ridge can enhance the scouring effect on the wall surface of the tank 10 under the impact of the oil flow, effectively reducing the wall surface oil deposition.

[0059] In an exemplary embodiment, the length of the flow divider plate 50 along the length direction of the laminar flow barrier plate 40 is not greater than one fourth of the total length of the laminar flow barrier plate 40. By limiting the coverage of the flow divider plate 50, it is ensured that the upper oil product will not be excessively blocked during circulation, thereby avoiding affecting the normal deposition and circulation flow of the upper oil product, and maintaining the oil product stratification and circulation efficiency.

[0060] In an exemplary embodiment, the tail of the laminar flow barrier plate 40 is inclined upward along the oil flow direction, and the upper surface thereof is provided with a horn-shaped flow guide ridge extending outward along the flow direction. Through fluid dynamics design, the flow velocity gradient of the oil flow is increased when passing through the tail, thereby strengthening the relative motion speed of the oil flow and the wall surface of the tank 10; the enhanced shear action can effectively inhibit the retention and deposition of oil products and impurities on the wall surface, reduce the risk of oil pollution caused by the accumulation of pollutants on the wall surface, and at the same time improve the self-cleaning efficiency of the inner wall surface of the tank 10, thereby ensuring the cleanliness of the oil circulation system.

[0061] In an exemplary embodiment, the longitudinal section of the through hole 401 is in the shape of an inverted trapezoid or an inverted cone, and the upper opening diameter is greater than the lower opening diameter. When the oil flow passes through the through hole 401, due to the larger upper opening area, the oil flow resistance is smaller, which is beneficial for the smooth downward flow of the oil product; the downwardly narrowing opening design forms a physical barrier, increasing the probability of downward deposition of impurities, and even if a small particle rises with the oil flow to the through hole 401 region, it will be effectively intercepted due to the reduction of the cross-sectional area; at the same time, this structure can effectively inhibit the possibility of downward flow of the lower oil product to the upper region due to pressure fluctuations or local turbulence, thereby fundamentally reducing the risk of impurities entering the upper key region with the oil flow circulation; the gradual transition of the inverted cone or inverted trapezoid can also avoid stress concentration, improve the structural strength, ensure that the shape of the through hole 401 remains stable during the long-term operation of the transformer, and continuously play the dual functions of impurity filtration and oil flow guidance, thereby improving the cleanliness and operation reliability of the transformer oil.

[0062] In another aspect, the embodiment of the present application also provides a temperature control method for the integral blade type oil-immersed transformer, comprising the following steps:

[0063] Real-time monitoring of the transformer oil temperature and the ambient temperature;

[0064] Dynamic adjustment of 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 grades: the first grade is 20℃≤T<60℃, the second grade is 60℃≤T<65℃, and the third grade is T≥65℃;

[0065] When the real-time monitored transformer oil temperature reaches the third grade or the ambient temperature exceeds the preset ambient temperature threshold value, the solar power driven motor is started, and the propeller type rotating blade 20 is controlled to operate at a speed higher than the preset speed reference value;

[0066] When the real-time monitored transformer oil temperature is within the range of the first grade and the second grade, the solar power driven motor is started, and the speed of the propeller type rotating blade 20 is controlled to be not more than the preset speed reference value;

[0067] When the real-time monitored transformer oil temperature is lower than the threshold value of the first grade or the solar energy storage is lower than the preset capacity threshold value, the passive cooling mode is switched to, the auxiliary heat dissipation of the corner of the box body 10 is realized through the inflatable body 80, and the circulating oil flow is realized to suppress the dead angle deposition.

[0068] Specifically, the integral blade type oil-immersed transformer temperature control method adopts a multi-stage dynamic adjustment mechanism to achieve precise temperature control and system self-cleaning. The system monitors the transformer oil temperature and environmental temperature in real time, and dynamically adjusts the motor speed based on the preset three-stage temperature threshold (first stage 20℃≤T<60℃, second stage 60℃≤T<65℃, third stage T≥65℃). When the real-time monitored transformer oil temperature reaches the third stage (T≥65℃) or the environmental temperature exceeds 40℃, it automatically switches to a solar power supply mode and drives the propeller rotating blade 20 to operate at a speed higher than 1200rpm to intensify the heat oil circulation heat dissipation; when the oil temperature difference is in the first and second stage range, solar power is used but the blade speed is controlled not to exceed 1200rpm to maintain efficient and low-consumption operation; when the oil temperature difference is less than 20℃ or the solar energy storage is less than 30% of the total capacity, the passive cooling mode is started, and the expandable body 80 is controlled to expand at the corner of the box 10 to push the dead angle accumulated oil out and into the main circulation, which not only eliminates the local overheating risk but also uses oil flow to suppress wall impurity deposition. In particular, under the conditions of rapid increase of transformer oil temperature (T≥65℃), extreme high temperature environment (strong sunlight causes environmental temperature>40℃) or equipment abnormal temperature rise, the solar energy storage is preferentially called to drive high-speed blades to improve heat dissipation efficiency; while in the case of large temperature difference but moderate environment (20℃≤T<60℃ and insufficient sunlight) or occasional abnormal temperature rise of equipment, the solar energy storage is used to maintain the regular speed of the blade. The scheme realizes precise temperature control in all working conditions through active forced circulation + passive auxiliary heat dissipation cooperation, combined with multi-stage temperature threshold judgment and energy management, while reducing the deposition inside the box 10 by using oil flow circulation, effectively improving the oil cleanliness and equipment service life.

[0069] The above only describes optional embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope 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; A defoaming rod (30) is arranged between two adjacent propeller-type rotating blades (20), and has a surface densely arranged vertical defoaming rods (301) for breaking and eliminating bubbles generated at the tail or blade edge due to the rotation of the propeller-type rotating blade (20); A laminar flow baffle (40) is provided at the bottom of the box (10), a preset distance is maintained between the laminar flow baffle (40) and the bottom surface of the box (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); 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.

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: 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.

4. The integral blade type oil-immersed transformer according to claim 3, 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.

5. The integral blade type oil-immersed transformer according to claim 1, 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).

6. The integral blade type oil-immersed transformer according to claim 1, 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.

7. The integral blade type oil-immersed transformer according to claim 1, 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.

8. The temperature control method of the integral blade type oil-immersed transformer according to claim 3 or 4, 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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