Heat dissipation structure of oil-immersed transformer

Abstract

The utility model relates to the technical field of transformers, in particular to an oil-immersed transformer heat dissipation structure which comprises corrugated cooling fins arranged on one side of a transformer box body and an oil conservator installed on one side of the transformer box body, and oil circulates between the interior of the oil conservator and the interior of the transformer box body through a first connecting pipeline and a second connecting pipeline. The second connecting pipeline is provided with an oil pump used for driving oil in the oil conservator to flow into the transformer box body in a one-way mode, the transformer box body is further provided with a temperature sensor used for detecting the temperature of the oil in the transformer box body, the transformer box body is further provided with a controller, and the input end of the controller is connected with the temperature sensor. The controller is used for receiving temperature signals of the temperature sensor, the output end of the controller is used for outputting control signals, the control signals are used for controlling the oil pump to operate, oil in an oil conservator of the oil-immersed transformer can participate in heat dissipation of the interior of the transformer, and the heat dissipation performance of the oil-immersed transformer is better.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a heat dissipation structure of an oil-immersed transformer. Background Art

[0002] Transformers are divided into oil-immersed transformers and dry-type transformers, among which oil-immersed transformers use oil for cooling, while dry-type transformers mostly use fans for cooling. In order to adapt to the thermal expansion and contraction of the internal oil, the existing oil-immersed transformers usually need to be equipped with an oil pillow, in which oil is stored. When the oil inside the transformer box expands, the volume increases, and the expanded overflowing oil will enter the inside of the oil pillow. When the oil temperature inside the transformer box decreases, the oil volume decreases. At this time, the oil inside the oil pillow will replenish the inside of the transformer box, so that the inside of the transformer box is always full of oil. The problem with the prior art is that the existing transformer box only relies on external corrugated heat sinks for heat dissipation when dissipating heat. Fans are also added to some of the corrugated heat sinks to increase the air flow at the gaps between the corrugated heat sinks to further ensure the heat dissipation of the oil. However, the oil inside the oil pillow has never participated in the heat dissipation process, so its heat dissipation structure can still be further improved. Utility Model Content

[0003] The utility model provides an oil-immersed transformer heat dissipation structure, which can enable the oil on the transformer box oil pillow to also participate in heat dissipation, thereby further increasing the heat dissipation effect of the oil-immersed transformer.

[0004] The technical problem solved by the utility model is achieved by the following technical solutions:

[0005] A heat dissipation structure for an oil-immersed transformer comprises a corrugated heat sink arranged on one side of a transformer box and an oil pillow installed on one side of the transformer box. Oil circulation is achieved between the interior of the oil pillow and the interior of the transformer box via a first connecting pipe and a second connecting pipe. An oil pump is provided on the second connecting pipe to drive the oil in the oil pillow to flow unidirectionally into the interior of the transformer box.

[0006] Preferably, the transformer box is also provided with a temperature sensor for detecting the oil temperature inside the transformer box, and the transformer box is also provided with a controller, the input end of the controller is connected to the temperature sensor for receiving the temperature signal of the temperature sensor, and the output end of the controller is used to output a control signal, and the control signal is used to control the operation of the oil pump.

[0007] Preferably, the connection point between the first connecting pipe and the transformer box is at a high position, and the connection point between the second connecting pipe and the transformer box is at a low position.

[0008] Preferably, the connection points between the first connecting pipe and the second connecting pipe and the oil pillow are far away from each other.

[0009] Preferably, the lower part of the oil pillow is divided into a plurality of cooling chambers by opening a plurality of linearly arranged heat dissipation ducts, and the input end of the second connecting pipe is connected to the plurality of cooling chambers.

[0010] Preferably, the oil pillow is also provided with a fan for increasing the airflow inside the heat dissipation duct.

[0011] The utility model has the beneficial effect of enabling the oil in the oil pillow of the oil-immersed transformer to participate in the heat dissipation inside the transformer, thereby improving the heat dissipation performance of the oil-immersed transformer.

[0012] By setting up a temperature sensor, a controller and an oil pump, the oil inside the oil pillow can be automatically started and stopped when the oil is dissipating heat.

[0013] By arranging a heat dissipation duct and a fan at the bottom of the oil pillow, the cooling of the oil inside the oil pillow can be accelerated, so that the cooling effect on the inside of the transformer is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation scheme of the utility model or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a schematic diagram of the structure of the prior art of the utility model:

[0016] Figure 2 It is a longitudinal sectional view of the prior art of the utility model;

[0017] Figure 3 It is a transverse cross-sectional view of the prior art of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure of the utility model;

[0019] Figure 5 It is a transverse cross-sectional schematic diagram of the utility model;

[0020] Figure 6 This is a structural schematic diagram of the oil pillow of the utility model from the first perspective;

[0021] Figure 7 This is a structural schematic diagram of the oil pillow of the utility model from a second viewing angle;

[0022] Figure 8 It is a cross-sectional schematic diagram of the oil pillow of the utility model;

[0023] Fig. 9 It is a schematic diagram of the structure in which the connecting vessel and the oil pillow are separated in the utility model.

[0024] In the figure, 1. transformer box; 2. corrugated heat sink; 3. oil pillow; 4. connecting pipe; 5. breathing tube; 6. respirator; 7. capsule; 8. first connecting pipe; 9. second connecting pipe; 10. oil pump; 11. controller; 12. temperature sensor; 13. cooling air duct; 14. fan; 15. connecting room; 16. cooling room; 17. opening two; 18. opening one. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0026] refer to Figure 1-Figure 3 , is a structural schematic diagram of the prior art of the utility model. The existing oil-immersed transformer includes a transformer box 1, an oil pillow 3 and a corrugated heat sink 2 installed on the side wall of the transformer box 1. The oil pillow 3 mainly ensures that the oil inside the transformer box 1 can always be in a full load state when the oil inside the transformer box 1 expands and contracts. The corrugated heat sink 2 is mainly used to cool the oil inside the transformer box 1. In order to make it easier for those skilled in the art to understand the innovative points of the utility model, the existing oil pillow 3 structure is described in detail (this description is for the capsule 7 type oil pillow 3, but the existing oil pillow 3 also includes a diaphragm oil pillow 3, which can also be applicable to the utility model), such as Figure 2 and Figure 3 As shown, the main body of the oil pillow 3 is a cylindrical chamber, which is used to store oil. The chamber is connected to the inside of the transformer box 1 through a connecting pipe 4. An expandable capsule 7 is arranged inside the chamber. The capsule 7 is connected to the external atmosphere through a breathing tube 5 and a respirator 6. When the oil inside the transformer heats up and expands in volume, the oil inside the transformer box 1 overflows through the connecting pipe 4 and enters the chamber of the oil pillow 3. The oil inside the chamber squeezes the capsule 7, and the air inside the capsule 7 is discharged into the atmosphere through the breathing tube 5 and the respirator 6 (the respirator 6 is the prior art, and the respirator 6 is mainly used to remove moisture from the atmosphere). When the oil inside the transformer box 1 cools down, the volume of the oil shrinks. At this time, the oil inside the chamber of the oil pillow 3 flows back to the inside of the transformer box 1 through the connecting pipe 4, and the external atmosphere enters the inside of the capsule 7 through the respirator 6 and the breathing tube 5. Therefore, the existing oil pillow 3 is mainly used to maintain a constant pressure inside the transformer box 1, and keep the inside of the transformer box 1 always full of oil. The above is an introduction of the prior art to the utility model.

[0027] From the introduction of the above-mentioned prior art, it can be known that the existing oil-immersed transformer only dissipates heat through the corrugated heat sink 2, and there is always a large amount of oil inside the oil pillow 3 of the oil-immersed transformer, and the oil does not participate in the heat dissipation process inside the transformer box 1. Based on this phenomenon, the utility model makes the following improvements to the existing oil-immersed transformer to make the heat dissipation effect of the oil-immersed transformer better.

[0028] refer to Figure 4 The utility model replaces the existing connecting pipe 4 provided between the oil pillow 3 and the inside of the transformer box 1 with two pipelines, namely a first connecting pipe 8 and a second connecting pipe 9, and an oil pump 10 is provided on the second connecting pipe 9 to control the unidirectional flow of the oil inside the oil pillow 3 to the inside of the transformer box 1. Therefore, when the oil temperature inside the transformer box 1 is high, the oil inside the oil pillow 3 can be driven by the oil pump 10 and the second connecting pipe 9 to enter the inside of the transformer box 1, so that the cooler oil inside the oil pillow 3 is mixed with the hotter oil inside the transformer box 1, so that the inside of the transformer box 1 is quickly cooled. Since the oil inside the oil pillow 3 enters the inside of the transformer box 1, the oil pressure inside the transformer box 1 increases, and the transformer box 1 is cooled. The oil inside the transformer case 1 flows back from the first connecting pipe 8 to the inside of the oil pillow 3. This is a heat dissipation process. When the oil inside the oil pillow 3 does not participate in the heat dissipation process inside the transformer case 1, the oil pump 10 does not run. At this time, the second connecting pipe 9 is in an open circuit state due to the obstruction of the oil pump 10, and the first connecting pipe 8 between the transformer case 1 and the oil pillow 3 is always in a passage state. At this time, the oil pillow 3 and the transformer case 1 are connected only through the first connecting pipe 8. When the oil inside the transformer case 1 is at a higher temperature, the oil inside the transformer case 1 enters the inside of the oil pillow 3 through the first connecting pipe 8. When the oil temperature inside the transformer case 1 decreases, the oil inside the oil pillow 3 enters the inside of the transformer case 1 through the first connecting pipe 8.

[0029] For further reference, Figure 5 In order to enable the oil inside the oil pillow 3 to actively participate in the circulation when the temperature inside the transformer box 1 is high, a temperature sensor 12 and a controller 11 are also provided on the transformer box 1. When the temperature sensor 12 detects that the oil temperature inside the transformer box 1 is high (the temperature is higher than the set value), the temperature signal is transmitted to the controller 11, and the controller 11 controls the oil pump 10 to work, so that the oil inside the oil pillow 3 enters the inside of the transformer box 1. When the temperature sensor 12 detects that the temperature inside the transformer box 1 drops to the set value (the set value is set by the controller 11, which is an existing mature technology), the controller 11 controls the oil pump 10 to stop running. At this time, the oil inside the oil pillow 3 does not participate in the heat dissipation work.

[0030] For further reference, Figure 4 The connection point between the first connecting pipe 8 and the transformer box 1 is higher than the connection point between the second connecting pipe 9 and the transformer box 1. Specifically, the first connecting pipe 8 can be connected to the top wall of the transformer box 1, and the second connecting pipe 9 can be connected to the bottom wall of the transformer box 1, thereby allowing the cooler oil inside the oil pillow 3 to enter the inside of the transformer box 1 from the lower position of the transformer box 1, and the higher temperature oil inside the transformer box 1 flows back from the first connecting pipe 8 into the inside of the oil pillow 3, ensuring that the oil inside the oil pillow 3 stays in the transformer box 1 for a long enough time to cool the inside of the transformer box 1.

[0031] For further reference, Figure 4 In order to ensure that the oil entering the oil pillow 3 through the first connecting pipe 8 inside the transformer box 1 can fully stay inside the oil pillow 3 for cooling, the first connecting pipe 8 and the second connecting pipe 9 should be connected to the oil pillow 3 away from each other. Specifically, the first connecting pipe 8 should be connected to one side of the oil pillow 3, and the second connecting pipe 9 should be connected to the other side of the oil pillow 3, so as to fully ensure that the oil entering the oil pillow 3 from the transformer box 1 can stay in the oil pillow 3 for a long time.

[0032] For further reference, Figure 6 , Figure 7 and Figure 8 In order to ensure that the oil inside the oil pillow 3 can be cooled quickly, the lower part of the oil pillow 3 is divided into multiple cooling chambers 16 by opening multiple linearly arranged heat dissipation ducts 13. The input end of the second connecting pipe 9 is connected to the multiple cooling chambers 16. By setting the heat dissipation duct 13, the contact area between the oil pillow 3 and the air can be increased, thereby achieving rapid cooling of the oil inside the oil pillow 3. The heat dissipation duct 13 is spaced apart from the cooling chamber 16, which can be fully increased. The heat dissipation duct 13 can be as follows: Figure 6 As shown, it can be opened along the axial direction of the oil pillow 3, or it can be opened along the horizontal diameter direction of the cross section of the oil pillow 3. Both methods can increase the contact area between the oil pillow 3 and the external air.

[0033] For the above, further explanation is needed: Fig. 9 As shown, since the multiple cooling chambers 16 are separated by the heat dissipation duct 13, if the second connecting pipe 9 wants to be connected with the multiple cooling chambers 16, a connecting chamber 15 should be set between the second connecting pipe 9 and the multiple cooling chambers 16. The connecting chamber 15 has multiple openings 18 corresponding to the cooling chambers 16, and the multiple cooling chambers 16 are all provided with openings 17. By connecting the openings 18 on the connecting chamber 15 with the openings 17 on the cooling chambers 16, the liquids in the multiple cooling chambers 16 can flow into the connecting chamber 15.

[0034] In order to further enhance the fluidity of the air in the heat dissipation duct 13 inside the oil pillow 3, as Figure 7 As shown, the oil pillow 3 is also provided with a fan 14 for increasing the air flow inside the heat dissipation duct 13 .

[0035] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A heat dissipation structure for an oil-immersed transformer, comprising a corrugated heat sink (2) arranged on one side of a transformer box (1), and an oil pillow (3) installed on one side of the transformer box (1), characterized in that: Oil circulation is achieved between the interior of the oil pillow (3) and the interior of the transformer box (1) via a first connecting pipe (8) and a second connecting pipe (9), and the second connecting pipe (9) is provided with an oil pump (10) for driving the oil inside the oil pillow (3) to flow unidirectionally into the interior of the transformer box (1).

2. The oil-immersed transformer heat dissipation structure according to claim 1, characterized in that: The transformer box (1) is also provided with a temperature sensor (12) for detecting the temperature of the oil inside the transformer box (1). The transformer box (1) is also provided with a controller (11). The input end of the controller (11) is connected to the temperature sensor (12) for receiving a temperature signal from the temperature sensor (12). The output end of the controller (11) is used to output a control signal, and the control signal is used to control the operation of the oil pump (10).

3. The oil-immersed transformer heat dissipation structure according to claim 1, characterized in that: The connection point between the first connecting pipe (8) and the transformer box (1) is at a high position, and the connection point between the second connecting pipe (9) and the transformer box (1) is at a low position.

4. The oil-immersed transformer heat dissipation structure according to claim 1, characterized in that: The connection points between the first connecting pipe (8) and the second connecting pipe (9) and the oil pillow (3) are far away from each other.

5. The oil-immersed transformer heat dissipation structure according to claim 1, characterized in that: The lower part of the oil pillow (3) is divided into a plurality of cooling chambers (16) by providing a plurality of linearly arranged heat dissipation ducts (13) at the lower part of the oil pillow (3), and the input end of the second connecting pipe (9) is connected to the plurality of cooling chambers (16).

6. The oil-immersed transformer heat dissipation structure according to claim 5, characterized in that: The oil pillow (3) is also provided with a fan (14) for increasing the air flow inside the heat dissipation air duct (13).

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