Oil-immersed transformer capable of rapid cooling

Abstract

The utility model relates to transformer technical field discloses an oil -immersed transformer of quick cooling, including transformer body, the front side and rear side of transformer body all are fixedly installed with multiple oil outlet pipes and oil inlet pipe, and the oil inlet pipe is located below corresponding oil outlet pipe, and every oil outlet pipe is fixedly connected with multiple cooling fins of oil inlet pipe directly below it, and the front side of cooling fin is fixedly installed with heat exchange fin, and the front side of heat exchange fin is fixedly installed with liquid inlet joint and liquid outlet joint respectively. The transformer body is configured with the oil inlet and outlet pipe arranged up and down and is connected in series with the cooling fin, and multiple embedded grooves are integrally formed on both sides of the cooling fin, thereby expanding the heat dissipation base area, at the same time, the heat exchange fin is arranged on one side of the cooling fin, and the fins of the heat exchange fin are embedded in the embedded groove of the cooling fin to realize close heat conduction, the cold and hot medium cavities are isolated from each other, and the heat exchange pipe is buried underground in a matched mode, and the depth heat exchange is completed by means of the constant temperature characteristics of the stratum and the circulating medium.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an oil-immersed transformer that can be rapidly cooled. Background Technology

[0002] Existing oil-immersed transformers generally rely on insulating oil as a heat exchange medium to conduct heat. The heat generated by the operation of the windings and core is first transferred to the surrounding insulating oil. The heated oil flows upward, completes the heat exchange through the radiator, and then falls back down, relying on natural convection or forced circulation for continuous heat dissipation.

[0003] However, during long-term on-site operation and maintenance, it was found that conventional plate heat sinks rely solely on air convection for heat dissipation, and their heat dissipation capacity is significantly limited by ambient temperature. In particular, the air heat exchange efficiency drops sharply in high-temperature environments in summer, making it more difficult to control the temperature rise of the transformer. Simply adding fans for forced air cooling can only slightly improve the heat dissipation conditions, but energy consumption continues to increase. When the equipment is running under heavy load for a long time, it is easy to form local overheating areas, which accelerates the cracking and aging of insulating oil and affects the stability of the internal insulation structure. Utility Model Content

[0004] The purpose of this invention is to provide an oil-immersed transformer that can cool down quickly. It relies on the heat exchange structure of the heat sink and the underground soil layer to dissipate heat in a coordinated manner, and is equipped with air cooling to effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An oil-immersed transformer capable of rapid cooling includes a transformer body. Multiple oil outlet pipes and oil inlet pipes are symmetrically fixedly installed on the front and rear sides of the transformer body, with the oil inlet pipes located below the corresponding oil outlet pipes. Each oil outlet pipe and its directly below oil inlet pipe are fixedly connected to multiple heat dissipation fins. Heat exchange plates are fixedly installed on the front side of each heat exchange plate, and liquid inlet and outlet connectors are respectively fixedly installed on the front side of each heat exchange plate, located at opposite ends of the front diagonal of the heat exchange plate. A circulation pump is located on one side of the transformer body. The heat exchange pipe is buried in the soil, with one end of the heat exchange pipe connected to the input end of the circulation pump. Multiple liquid inlet connectors are connected in parallel through pipelines and connected to the output end of the circulation pump. Multiple liquid outlet connectors are connected in parallel through pipelines and connected to the other end of the heat exchange pipe.

[0006] As a further preferred embodiment of this utility model, the front and rear sides of the heat sink are integrally bent to form multiple equally spaced embedded grooves. The transverse cross-section of the embedded grooves is U-shaped. By setting multiple embedded grooves, the heat dissipation surface area of ​​the heat sink can be increased. At the same time, it also provides a heat conduction path for the connection between the heat exchange plate and the heat sink.

[0007] As a further preferred embodiment of this utility model, the upper and lower ends of the heat sink are respectively provided with connection ports adapted to the outer contours of the oil outlet pipe and the oil inlet pipe. The heat sink is connected to the inner cavity of the corresponding oil outlet pipe and the oil inlet pipe through the two connection ports, so that the oil in the transformer body enters the cavity of multiple heat sinks through the oil outlet pipe for heat dissipation and then collects and re-enters the transformer body through the oil inlet pipe. The fins and the embedded grooves are thermally conductive and sealed together, and the heat exchange medium cavity and the oil cavity of the heat sink are isolated from each other and do not communicate with each other.

[0008] As a further preferred embodiment of this utility model, the heat exchange plate has multiple equidistantly arranged fins integrally formed on both its front and rear sides. The heat exchange plate communicates with the inner cavities of the multiple fins. The two sides of the heat exchange plate are fixedly connected to the heat sink through side fixing plates. The multiple fins of the heat exchange plate on the side opposite to the heat sink are inserted into corresponding embedded grooves. During normal heat dissipation, the heat exchange plate can play an auxiliary heat dissipation function, increasing the heat dissipation surface area of ​​the heat sink. When the heat exchange medium flows between the heat exchange plate and the fins, the heat of the oil in the heat sink can be transferred to the heat exchange tube by the heat exchange medium through the fins and the heat exchange plate. This utilizes the constant temperature environment in the soil to improve the heat dissipation efficiency and quality of the transformer body.

[0009] As a further preferred embodiment of this utility model, an auxiliary cooling fan is fixedly installed at the lower end of the two adjacent oil inlet pipes, which can accelerate the airflow speed around the heat sink and play an auxiliary cooling role.

[0010] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the transformer body is equipped with inlet and outlet oil pipes arranged vertically and connected in series with heat sinks. Multiple embedded grooves are integrally formed on both sides of the heat sinks, thereby expanding the heat dissipation base area. At the same time, a heat exchange plate is set on one side of the heat sink, and the fins of the heat exchange plate are embedded in the embedded grooves of the heat sink to achieve close heat conduction. The hot and cold medium cavities are isolated from each other, and an underground buried heat exchange pipe is provided. With the help of the constant temperature characteristics of the ground and the circulation medium, deep heat exchange is completed. At the same time, an auxiliary fan is added to enhance air convection, which can effectively reduce the operating oil temperature of the transformer, slow down the aging rate of the insulating oil, and extend the service life of the equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram showing the arrangement of the transformer body and the circulating pump according to this utility model. Figure 2 This is a schematic diagram of the transformer body structure of this utility model; Figure 3 This is a schematic diagram of the assembly of the oil outlet pipe, oil inlet pipe, and heat sink of this utility model; Figure 4 This is a top view of the assembly of the oil outlet pipe, oil inlet pipe, and heat sink of this utility model; Figure 5 This is a schematic diagram of the assembly of the heat sink and heat exchange plate of this utility model; Figure 6 This is a cross-sectional schematic diagram of the heat sink and heat exchange plate of this utility model.

[0012] In the diagram: 1. Transformer body; 2. Circulating pump; 3. Oil outlet pipe; 4. Oil inlet pipe; 5. Heat sink; 6. Heat exchange fins; 7. Liquid inlet connector; 8. Liquid outlet connector; 9. Heat exchange tube; 10. Embedded groove; 11. Connection port; 12. Fins; 13. Side fixing plate; 14. Auxiliary cooling fan. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] like Figures 1-6 As shown, the present invention provides an oil-immersed transformer capable of rapid cooling, comprising a transformer body 1. Multiple oil outlet pipes 3 and oil inlet pipes 4 are symmetrically fixedly installed on the front and rear sides of the transformer body 1, with the oil inlet pipes 4 located below the corresponding oil outlet pipes 3. Each oil outlet pipe 3 and its directly below oil inlet pipe 4 are fixedly connected to multiple heat sinks 5. Heat exchange plates 6 are fixedly installed on the front side of the heat exchange plates 5. Liquid inlet connectors 7 and liquid outlet connectors 8 are fixedly installed on the front side of the heat exchange plates 6, respectively, and are located at opposite ends of the front diagonal of the heat exchange plates 6. A circulation pump 2 is located on one side of the transformer body 1. Heat exchange pipes 9 are buried in the soil, with one end of the heat exchange pipe 9 connected to the input end of the circulation pump 2. Multiple liquid inlet connectors 7 are connected in parallel through pipelines and connected to the output end of the circulation pump 2. Multiple liquid outlet connectors 8 are connected in parallel through pipelines and connected to the other end of the heat exchange pipe 9.

[0015] The front and rear sides of the heat sink 5 are integrally bent to form multiple equidistant embedded grooves 10. The transverse cross-section of the embedded grooves 10 is U-shaped. The multiple embedded grooves 10 increase the heat dissipation surface area of ​​the heat sink 5 and provide a heat conduction path for the connection between the heat exchanger 6 and the heat sink 5. The upper and lower ends of the heat sink 5 are respectively provided with connection ports 11 that are adapted to the outer contours of the oil outlet pipe 3 and the oil inlet pipe 4. The heat sink 5 is connected to the inner cavity of the corresponding oil outlet pipe 3 and the oil inlet pipe 4 through the two connection ports 11, so that the oil in the transformer body 1 enters the cavity of the multiple heat sinks 5 through the oil outlet pipe 3 for heat dissipation, and then collects and re-enters the transformer body 1 through the oil inlet pipe 4. The fins 12 and the embedded grooves 10 are thermally conductive and sealed together. The oil cavity of the heat exchanger 6 and the heat sink 5 are isolated from each other and do not communicate with each other. The front and rear sides of the heat exchanger 6 are integrally formed with multiple equidistant fins 12. The heat exchanger 6 is connected to the inner cavity of the multiple fins 12. The two sides of the heat exchanger 6 are fixedly connected to the heat sink 5 through the side fixing plate 13. The multiple fins 12 of the heat exchanger 6 on the side of the heat sink 5 are inserted into the corresponding inner groove 10. During normal heat dissipation, the heat exchanger 6 can play the role of auxiliary heat dissipation and increase the heat dissipation surface area of ​​the heat sink 5. When the heat exchange medium flows between the heat exchanger 6 and the fins 12, the heat of the oil in the heat sink 5 can be transferred to the heat exchange tube 9 through the heat exchange medium via the fins 12 and the heat exchanger 6. Thus, the constant temperature environment in the soil layer is used to improve the heat dissipation efficiency and quality of the transformer body 1.

[0016] The lower ends of the two adjacent oil inlet pipes 4 are fixedly equipped with auxiliary cooling fans 14, which can accelerate the airflow around the heat sink 5 and play an auxiliary cooling role.

[0017] It should be noted that this utility model is an oil-immersed transformer capable of rapid cooling. After being put into operation, the windings and core inside the transformer body 1 convert electromagnetic losses into heat, causing the insulating oil to continuously heat up. Driven by thermal buoyancy, the high-temperature oil at the top layer flows naturally out through the oil outlet pipe 3 arranged above the transformer body 1, and then flows into the flat cavities of each group of heat sinks 5. Because the surface of the heat sink 5 is formed with multiple equidistant U-shaped embedded grooves 10 through stamping, these grooves 10 not only significantly expand the contact area between the heat sink 5 and the external air, but also provide a heat conduction path for the subsequent embedding of heat exchange plates 6. The transformer oil carrying a large amount of residual heat flows slowly from top to bottom within the heat sink 5 cavity, conducting heat to the metal shell of the heat sink 5. Some of the heat is directly discharged into the surrounding atmosphere in the form of natural convection and thermal radiation, achieving basic heat dissipation.

[0018] To overcome the bottleneck of high ambient temperature and a sharp drop in air heat dissipation capacity in summer, the heat exchanger 6 is assembled closely to the outside of the heat sink 5. Its body and the inner cavity of multiple integrally stretched fins 12 are interconnected, forming an independent heat exchange medium flow space. All the fins 12 on one side of the heat exchanger 6 are embedded in the corresponding inner grooves 10 of the heat sink 5. The walls of the two are tightly bonded through a large contact area and thermally conductive interface material, realizing efficient cross-wall transfer of heat from the oil side to the medium side. At the same time, it ensures that the transformer oil and the heat exchange medium are sealed and do not come into contact with each other. When the oil temperature reaches the preset high limit, the circulation pump 2 is started in a controlled manner, drawing heat from the underground constant temperature layer. The heat exchange medium, which has been fully cooled by the soil, is drawn into the heat exchange tube 9. The low-temperature medium is synchronously transported to the liquid inlet 7 of each group of heat exchange plates 6 through parallel pipelines, and quickly fills the cavity of the heat exchange plates 6 and all the fins 12. At this time, the heat on the wall of the heat sink 5 is continuously transferred to the fins 12 through the embedded groove 10, and then absorbed and carried away by the heat exchange medium flowing inside. The heated medium flows out from the liquid outlet 8 located at the far end of the diagonal, and after merging, it returns to the deeply buried heat exchange tube 9 to exchange heat with the soil with a relatively constant underground temperature, releasing heat to the stratum. The cooled medium is drawn back into the circulation pump 2, forming a closed geothermal cycle.

[0019] In addition, the auxiliary cooling fan 14 at the bottom of the oil inlet pipe 4 is put into operation simultaneously, forcibly blowing air onto the outer surface of the heat sink 5 and heat exchange fins 6, accelerating air convection on the air side, and further removing surface heat. When the top oil temperature of the transformer body 1 gradually drops to within the safe hysteresis range as the heat dissipation process progresses, the circulating pump 2 and the auxiliary cooling fan 14 automatically stop operating.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer capable of rapid cooling, characterized in that: The transformer body (1) includes a transformer body (1), on which multiple oil outlet pipes (3) and oil inlet pipes (4) are symmetrically fixedly installed on the front and rear sides. The oil inlet pipes (4) are located below the corresponding oil outlet pipes (3). Each oil outlet pipe (3) is fixedly connected to the oil inlet pipe (4) directly below it with multiple heat sinks (5). Heat exchange plates (6) are fixedly installed on the front side of the heat sinks (5). Liquid inlet connectors (7) and liquid outlet connectors (8) are fixedly installed on the front side of the heat exchange plates (6). The liquid inlet connectors (7) and liquid outlet connectors (8) are located at one end of the diagonal line on the front side of the heat exchange plates (6). The circulating pump (2) is located on one side of the transformer body (1); The heat exchange tube (9) is buried in the soil, and one end of the heat exchange tube (9) is connected to the input end of the circulating pump (2). Multiple liquid inlet connectors (7) are connected in parallel through pipelines and connected to the output end of the circulating pump (2). Multiple liquid outlet connectors (8) are connected in parallel through pipelines and connected to the other end of the heat exchange tube (9).

2. The oil-immersed transformer with rapid cooling according to claim 1, characterized in that: The heat sink (5) has multiple equidistant embedded grooves (10) integrally bent on both the front and rear sides, and the transverse cross section of the embedded grooves (10) is U-shaped.

3. The rapidly cooling oil-immersed transformer according to claim 2, characterized in that: The upper and lower ends of the heat sink (5) are respectively provided with connection ports (11) that are adapted to the outer contours of the oil outlet pipe (3) and the oil inlet pipe (4). The heat sink (5) is connected to the inner cavity of the corresponding oil outlet pipe (3) and the oil inlet pipe (4) through the two connection ports (11).

4. The rapidly cooling oil-immersed transformer according to claim 3, characterized in that: The heat exchange plate (6) has multiple equidistant fins (12) integrally formed on both the front and rear sides. The heat exchange plate (6) is connected to the inner cavity of the multiple fins (12). The two sides of the heat exchange plate (6) are fixedly connected to the heat sink (5) through the side fixing plate (13). The multiple fins (12) of the heat exchange plate (6) on the side opposite to the heat sink (5) are inserted into the corresponding inner groove (10).

5. The rapidly cooling oil-immersed transformer according to claim 1, characterized in that: An auxiliary cooling fan (14) is fixedly installed at the lower end of the two adjacent oil inlet pipes (4).

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