Energy-saving sealed oil-immersed transformer and heat dissipation cooling device thereof

Abstract

The application relates to the technical field of transformers, in particular to an energy-saving sealed oil-immersed transformer and a heat dissipation cooling device thereof. The front surface and the back surface of a transformer outer box are fixedly connected with vertical heat dissipation fins; the two sides of the transformer outer box are fixedly connected with bent heat dissipation fins; the top sides of the transformer outer box are bevels; the top sides of the bent heat dissipation fins are inwardly folded and matched with the bevels of the top sides of the transformer outer box; the bottom of the transformer outer box is fixedly connected with two supporting bottom frames; the top of each supporting bottom frame is fixedly connected with a lower clamp; the inner wall of the top of the transformer outer box is fixedly connected with an upper clamp; a transformer iron core is fixedly connected between the lower clamp and the upper clamp; a coil winding is mounted on the outer side of the transformer iron core; and a wire structure is fixedly connected with the top of the transformer outer box.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device. Background Technology

[0002] Existing sealed oil-immersed transformers generally use external wall finned air cooling for heat dissipation. Some large-capacity products use external piping and oil pumps to achieve forced oil circulation cooling, relying on the convection circulation of insulating oil to transfer the heat of the transformer body, which meets the basic heat dissipation requirements of outdoor power distribution for long-term operation.

[0003] Conventional cooling methods have obvious drawbacks: opening holes in the external oil circuit will damage the sealing structure of the tank, making it easy for oil to leak and water vapor to enter, shortening the service life of the insulating oil and winding insulation; the oil tank relies solely on natural convection for heat exchange, resulting in poor fluidity in the interlayer area between the core and windings, which easily leads to local hot spots; the oil pump and fan operate continuously, resulting in high energy consumption of auxiliary equipment, easy wear and failure of mechanical parts, high maintenance costs, and a fixed heat dissipation range, making it impossible to adaptively adjust the cooling area according to the longitudinal temperature rise distribution of the windings; therefore, this invention provides an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device to solve the problems mentioned in the background art.

[0005] The technical solution of this invention is: an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device, comprising a transformer outer casing, wherein vertical heat sinks are fixedly connected to the front and back of the transformer outer casing, and bent heat sinks are fixedly connected to both sides of the transformer outer casing. The top two sides of the transformer outer casing are inclined surfaces, and the tops of the bent heat sinks are folded inward to fit with the inclined surfaces of the top of the transformer outer casing. Two supporting bottom frames are fixedly connected to the bottom of the transformer outer casing, and a lower clamp is fixedly connected to the top of the supporting bottom frames. An upper clamp is fixedly connected to the inner wall of the top of the transformer outer casing, and the lower clamp and the upper clamp are fixedly connected. A transformer core is connected to the transformer housing, and coil windings are installed on the outer side of the transformer core. A conductor structure is fixedly connected to the top of the transformer housing. A reverse current base box is fixedly connected to the bottom inner wall of the transformer housing. An ultrasonic generating device is fixedly connected between the reverse current base box and the supporting base frame, and an ultrasonic generating device is fixedly connected between the two supporting base frames. The ultrasonic generating device is a full-area cavitation array. Two partition plates are fixedly connected to the inner side of the transformer housing. The partition plates are located between the transformer core and the bent heat sink. A temperature measuring probe is fixedly connected to the side of the two partition plates that is far apart from each other. The two partition plates are adjacent to each other. An upper temperature probe is fixedly connected to the side of each of the two partition plates, and a lower temperature probe is fixedly connected to the adjacent side of each partition plate. The upper temperature probe is located at the top of the side of the partition plate, and the lower temperature probe is located at the bottom of the side of the partition plate. In use: Transformer insulating oil is injected into the transformer outer casing. The transformer core and coil windings are conventionally connected. When heat is generated, the temperature of the insulating oil rises, and the ultrasonic generator at the bottom is activated. High-frequency ultrasonic waves propagate in the insulating oil, generating a periodic stretching and compression sound field, which excites micro-gas nuclei in the oil to generate transient cavitation bubbles. These bubbles expand and collapse in a very short time, completely breaking the static thermal boundary layer on the surface of the windings and core, and completely eliminating the mechanical... The mechanical oil pump is sealed, making it compatible with fully sealed maintenance-free transformers. It does not use oil tanks or oil pumps, thus avoiding damage to the sealing system. By setting up partition plates and the top slope of the transformer outer tank, the ultrasonic array emits a gradient sound field in a directional manner, causing the oil in the tank to form a fixed circulation direction where the low-temperature oil at the bottom flows upward to flush the heat source and the high-temperature oil at the top flows towards the radiator on the tank wall. This achieves orderly self-circulation throughout the entire area. By setting up middle, upper and lower temperature probes, the temperature of the insulating oil at different locations can be collected, thereby determining the activation of the ultrasonic generating device at the corresponding location. Conventional heat dissipation is achieved through bent and vertical heat sinks.

[0006] Preferably, a central sliding shaft is fixedly connected between the lower clamp and the upper clamp; mounting blocks are fixedly connected to adjacent sides of the two partition plates; a side sliding shaft is fixedly connected between the mounting blocks; a limiting slip ring is slidably engaged with the outer side of the central sliding shaft and the side sliding shaft; a reflector plate is fixedly connected to the outer side of the limiting slip ring; the reflector plate is made of alumina ceramic; the reflector plate is located outside the transformer core; the bottom of the reflector plate is an inwardly concave slope; and the ultrasonic generating device uses a high-power piezoelectric immersion ultrasonic transducer with a frequency band of 28kHz. Hz; In use: The reflector is made of alumina ceramic, which has the characteristics of ultra-high acoustic impedance, complete insulation and non-magnetic. When the ultrasonic generating device dissipates heat, when the ultrasonic wave is incident on the bottom of the reflector, it will generate ultrasonic radiation pressure. In essence, the amount of sound wave is transferred to the reflector, forming a continuous upward micro-push force. The reflector itself has a very small weight, and the buoyancy in the oil offsets most of the gravity. Only a weak radiation pressure is needed to overcome the remaining resistance. It performs directional cavitation heat exchange in the interlayer oil channels of different height ranges of the coil winding, and avoids the increase of the viscosity of the insulating oil and the deterioration of its fluidity.

[0007] This invention provides an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device, which has the following improvements and advantages compared with the prior art: Firstly, the present invention discloses an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device. Transformer insulating oil is injected into the transformer's outer casing. The transformer core and coil windings are conventionally connected. When heat is generated, the temperature of the insulating oil rises, activating the ultrasonic generator at the bottom. High-frequency ultrasonic waves propagate in the insulating oil, generating a periodic stretching and compression sound field. This excites micro-gas nuclei within the oil to generate transient cavitation bubbles. These bubbles expand and collapse in a very short time, completely breaking the static thermal boundary layer on the winding and core surfaces, thus completely eliminating the need for a mechanical oil pump and achieving a sealed design suitable for fully sealed, maintenance-free transformers. The transformer does not use oil tanks or pumps, thus avoiding damage to the sealing system. By setting up partition plates and a sloping top surface on the transformer outer casing, the ultrasonic array emits a gradient sound field in a directional manner, causing the oil in the tank to form a fixed circulation flow with the low-temperature oil at the bottom flowing upwards to flush the heat source and the high-temperature oil at the top flowing towards the radiator on the tank wall. This achieves orderly self-circulation throughout the entire area. By setting up middle, upper, and lower temperature probes, the temperature of the insulating oil at different locations can be collected, thereby determining the activation of the ultrasonic generating device at the corresponding location. Conventional heat dissipation is achieved through bent and vertical heat sinks. Secondly, the energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device described in this invention uses an alumina ceramic reflector, which has characteristics such as ultra-high acoustic impedance, complete insulation, and non-magnetic properties. When the ultrasonic generating device dissipates heat, ultrasonic radiation pressure is generated when the ultrasonic wave is incident on the bottom of the reflector. Essentially, the amount of sound wave is transferred to the reflector, forming a continuous upward micro-push force. The reflector itself has a very small weight, and the buoyancy in the oil offsets most of the gravity. Only a weak radiation pressure is needed to overcome the remaining resistance, enabling directional cavitation heat exchange in the interlayer oil channels of different height ranges of the coil winding, and avoiding the increase in viscosity and deterioration of fluidity of the insulating oil. In summary, this invention discloses an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device. This invention eliminates the need for external oil circuits and mechanical oil pumps, and relies on built-in sound field disturbance to achieve pump-free self-circulation of insulating oil. This does not damage the fully sealed structure of the transformer, eliminates oil leakage and water ingress problems, and significantly extends the service life of the insulating oil. The invention also features a liftable reflector that can directionally reflect sound waves, dynamically adjusting the heat dissipation range according to the heating area of ​​the winding, eliminating heat dissipation dead zones in the core winding interlayer, and resulting in more uniform winding temperature rise. Attached Figure Description

[0008] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the transformer outer casing structure of the present invention; Figure 3 This is a schematic diagram of the transformer core structure of the present invention; Figure 4 This is a schematic diagram of the partition plate structure of the present invention; Figure 5 This is a schematic cross-sectional view of the transformer casing of the present invention; Figure 6 This is a schematic diagram of the temperature probe structure of the present invention; Figure 7 This is a schematic diagram of the reflector structure of the present invention.

[0009] Explanation of reference numerals in the attached figures: 1. Transformer outer casing; 2. Bending heat sink; 3. Vertical heat sink; 4. Reverse flow base box; 5. Divider plate; 6. Support base frame; 7. Lower clamp; 8. Transformer core; 9. Coil winding; 10. Upper clamp; 11. Conductor structure; 12. Ultrasonic generating device; 13. Mounting clamp; 14. Middle temperature probe; 15. Middle sliding shaft; 16. Limiting slip ring; 17. Side sliding shaft; 18. Reflector plate; 19. Upper temperature probe; 20. Lower temperature probe. Detailed Implementation

[0010] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] This invention provides an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device through improvements. The technical solution of this invention is as follows: like Figures 1-7As shown, an energy-saving sealed oil-immersed transformer and its heat dissipation and cooling device include a transformer outer casing 1. Vertical heat sinks 3 are fixedly connected to the front and back of the transformer outer casing 1. Bent heat sinks 2 are fixedly connected to both sides of the transformer outer casing 1. The top two sides of the transformer outer casing 1 are sloped. The tops of the bent heat sinks 2 are folded inwards to fit the slopes of the top of the transformer outer casing 1. Two supporting base frames 6 are fixedly connected to the bottom of the transformer outer casing 1. A lower clamp 7 is fixedly connected to the top of the supporting base frames 6. An upper clamp 10 is fixedly connected to the inner top wall of the transformer outer casing 1. A transformer core 8 is fixedly connected between the lower clamp 7 and the upper clamp 10. A coil winding 9 is installed on the outside of the core 8. A conductor structure 11 is fixedly connected to the top of the transformer outer casing 1. A reverse flow base box 4 is fixedly connected to the bottom inner wall of the transformer outer casing 1. An ultrasonic generating device 12 is fixedly connected between the reverse flow base box 4 and the supporting base frame 6. An ultrasonic generating device 12 is also fixedly connected between the two supporting base frames 6. The ultrasonic generating device 12 is a full-area cavitation array. Two partition plates 5 are fixedly connected to the inside of the transformer outer casing 1. The partition plates 5 are located between the transformer core 8 and the bent heat sink 2. A middle temperature probe 14 is fixedly connected to the side of the two partition plates 5 that is far apart from each other. An upper temperature probe is fixedly connected to the side of the two partition plates 5 that is adjacent to each other. 19. A lower temperature probe 20 is fixedly connected to one side of each of the two partition plates 5. The upper temperature probe 19 is located at the top of the side of the partition plate 5, and the lower temperature probe 20 is located at the bottom of the side of the partition plate 5. In use: Transformer insulating oil is injected into the transformer outer casing 1. The transformer core 8 is conventionally connected to the coil winding 9. When heat is generated, the temperature of the insulating oil rises, and the ultrasonic generator 12 at the bottom is activated. High-frequency ultrasonic waves propagate in the insulating oil, generating a periodic stretching and compression sound field, which excites the micro-gas nuclei in the oil to generate transient cavitation bubbles. These bubbles expand and collapse in a very short time, completely breaking the static thermal boundary layer on the surface of the winding and core, thus completely eliminating the need for a mechanical oil pump. This design ensures a sealed environment suitable for fully sealed, maintenance-free transformers. It eliminates the need for oil tanks, pumps, and other structures, thus preserving the sealing system. By setting up a partition plate 5 and a sloping top surface on the transformer outer casing 1, the ultrasonic array emits a gradient sound field, creating a fixed circulation flow of the oil inside the tank. This flow is characterized by the low-temperature oil at the bottom flowing upwards to flush the heat source, and the high-temperature oil at the top flowing towards the radiator on the tank wall. This achieves orderly self-circulation throughout the entire area. By setting up a middle temperature probe 14, an upper temperature probe 19, and a lower temperature probe 20, the temperature of the insulating oil at different locations can be collected, thereby determining the activation of the ultrasonic generator 12 at the corresponding location. Conventional heat dissipation is achieved through the bent heat sink 2 and the vertical heat sink 3.

[0012] Furthermore, a central sliding shaft 15 is fixedly connected between the lower clamp 7 and the upper clamp 10. Mounting blocks 13 are fixedly connected to adjacent sides of the two partition plates 5. A side sliding shaft 17 is fixedly connected between the mounting blocks 13. A limiting slip ring 16 is slidably engaged with the outer sides of the central sliding shaft 15 and the side sliding shaft 17. A reflector plate 18 is fixedly connected to the outer side of the limiting slip ring 16. The reflector plate 18 is made of alumina ceramic and is located outside the transformer core 8. The bottom of the reflector plate 18 is an inwardly concave slope. The ultrasonic generating device 12 uses a high-power piezoelectric immersion ultrasonic transducer. The frequency band is 28kHz. In use: the reflector plate 18 is made of alumina ceramic, which has the characteristics of ultra-high acoustic impedance, complete insulation and non-magnetic properties. When the ultrasonic generating device 12 dissipates heat, when the ultrasonic wave is incident on the bottom of the reflector plate 18, it will generate ultrasonic radiation pressure. In essence, the amount of sound wave is transferred to the reflector plate, forming a continuous upward micro-push force. The reflector plate 18 itself has a very small weight, and the buoyancy in the oil offsets most of the gravity. Only a weak radiation pressure is needed to overcome the remaining resistance, so as to carry out directional cavitation heat exchange in the interlayer oil channels of different height ranges of the coil winding 9, and avoid the increase of the viscosity of the insulating oil and the deterioration of its fluidity.

[0013] Working Principle: During use: Transformer insulating oil is injected into the transformer outer casing 1. The transformer core 8 is conventionally connected to the coil winding 9. When heat is generated, the temperature of the insulating oil rises, and the ultrasonic generator 12 at the bottom is activated. High-frequency ultrasonic waves propagate in the insulating oil, generating a periodic stretching and compression sound field, which excites the micro-gas nuclei in the oil to generate transient cavitation bubbles. The bubbles expand and collapse in a very short time, completely breaking the static thermal boundary layer on the surface of the winding and core, completely eliminating the need for a mechanical oil pump, making it sealed. It is suitable for fully sealed maintenance-free transformers, without using oil tanks, oil pumps, or other structures, and will not damage the sealing system. By setting up the partition plate 5 and the inclined top of the transformer outer casing 1, the ultrasonic array directional emission forms a gradient sound field, causing the oil in the tank to form a fixed circulation flow direction in which the low-temperature oil at the bottom flows upward to flush the heat source, and the high-temperature oil at the top flows towards the radiator on the tank wall. The entire system operates in an orderly self-circulating manner. By setting up a middle temperature probe 14, an upper temperature probe 19, and a lower temperature probe 20, the temperature of the insulating oil at different locations can be collected, thereby determining the activation of the ultrasonic generating device 12 at the corresponding location. Conventional heat dissipation is achieved through the bent heat sink 2 and the vertical heat sink 3. The reflector plate 18 is made of alumina ceramic, which has characteristics such as ultra-high acoustic impedance, complete insulation, and non-magnetic properties. When the ultrasonic generating device 12 dissipates heat, ultrasonic radiation pressure is generated when ultrasonic waves are incident on the bottom of the reflector plate 18. Essentially, the amount of sound wave is transferred to the reflector plate, forming a continuous upward micro-push force. The reflector plate 18 itself has a very small weight, and the buoyancy in the oil offsets most of the gravity. Only a weak radiation pressure is needed to overcome the remaining resistance, enabling directional cavitation heat exchange in the interlayer oil channels of the coil winding 9 at different height ranges, and preventing the viscosity of the insulating oil from increasing and its fluidity from deteriorating.

[0014] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy-saving sealed oil-immersed transformer, comprising a transformer casing (1), characterized in that: Vertical heat sinks (3) are fixedly connected to the front and back of the transformer outer casing (1). Bending heat sinks (2) are fixedly connected to both sides of the transformer outer casing (1). The top two sides of the transformer outer casing (1) are inclined. The top of the bending heat sinks (2) is folded inward to fit the inclined surface of the top of the transformer outer casing (1). Two supporting bottom frames (6) are fixedly connected to the bottom of the transformer outer casing (1). A lower clamp (7) is fixedly connected to the top of the supporting bottom frame (6). An upper clamp (10) is fixedly connected to the inner wall of the top of the transformer outer casing (1). A transformer core (8) is fixedly connected between the lower clamp (7) and the upper clamp (10). A coil winding (9) is installed on the outside of the transformer core (8). A wire structure (11) is fixedly connected to the top of the transformer outer casing (1).

2. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 1, characterized in that: The bottom inner wall of the transformer outer casing (1) is fixedly connected to a reverse flow bottom box (4), and an ultrasonic generating device (12) is fixedly connected between the reverse flow bottom box (4) and the supporting bottom frame (6), and an ultrasonic generating device (12) is fixedly connected between the two supporting bottom frames (6). The ultrasonic generating device (12) is a global cavitation array.

3. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 2, characterized in that: The transformer outer casing (1) has two partition plates (5) fixedly connected to its inner side. The partition plates (5) are located between the transformer core (8) and the bent heat sink (2).

4. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 3, characterized in that: A middle temperature probe (14) is fixedly connected to one side of the two partition plates (5) that are far apart from each other. An upper temperature probe (19) is fixedly connected to one side of the two partition plates (5) that are adjacent to each other. A lower temperature probe (20) is fixedly connected to one side of the two partition plates (5) that are adjacent to each other. The upper temperature probe (19) is located at the top of the side of the partition plate (5), and the lower temperature probe (20) is located at the bottom of the side of the partition plate (5).

5. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 4, characterized in that: A middle sliding shaft (15) is fixedly connected between the lower clamp (7) and the upper clamp (10). An installation clamp (13) is fixedly connected to one side of the two partition plates (5). A side sliding shaft (17) is fixedly connected between the installation clamps (13). A limiting slip ring (16) is slidably engaged with the outer side of the middle sliding shaft (15) and the side sliding shaft (17). A reflector plate (18) is fixedly connected to the outer side of the limiting slip ring (16).

6. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 5, characterized in that: The material of the reflector (18) is alumina ceramic. The reflector (18) is located on the outside of the transformer core (8). The bottom of the reflector (18) is an inwardly concave slope.

7. The heat dissipation and cooling device for an energy-saving sealed oil-immersed transformer according to claim 2, characterized in that: The ultrasonic generating device (12) has a high-power piezoelectric immersion ultrasonic transducer with a frequency band of 28kHz.

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