Rapid heat dissipation oil-immersed transformer

Abstract

The utility model discloses a fast heat dissipation oil-immersed transformer, which comprises an oil tank and a plurality of finned radiators parallel to the side wall of the oil tank, an upper oil collecting pipe inclines downwards and is communicated with the upper part of the oil tank, and a plurality of oil channels are vertically arranged in a plurality of radiating fins along the width direction of the radiating fins. The oil channels comprise the first oil channel, the second oil channels and the third oil channels, the first oil channel is arranged in the middle of the interior of the cooling fin and configured to receive insulating oil from the upper oil collecting pipe firstly, the second oil channels are symmetrically arranged on the two sides of the first oil channel, and the third oil channels are symmetrically arranged on the outer sides of the second oil channels with the first oil channel as the center line and configured to receive insulating oil from the lower oil collecting pipe. The size of the cross section of the first oil duct, the size of the cross section of the second oil duct and the size of the cross section of the third oil duct are sequentially increased, the total heat dissipating capacity of the finned radiator is effectively improved by changing the inclination angle of the upper oil collecting pipe and the sizes of the oil ducts in the cooling fins, a transformer can rapidly dissipate heat and be cooled, and the service life of the transformer is prolonged. And the long-time high-load operation of the transformer is dealt with.

Description

Technical Field

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

[0002] Transformer is an important equipment of power system. Oil-immersed transformer is a kind of transformer. When transformer is running, transformer generates heat and the temperature rises. Insulating oil is heated and enters plate radiator. Plate radiator exchanges heat with the environment to reduce the oil temperature and insulating oil flows back to the bottom of oil tank. As the climate warms, high temperature weather occurs frequently and high temperature records are frequently set around the world. High temperature persists in some parts of my country, locally exceeding 40℃. Peak electricity demand becomes more common. Transformer needs to run at high load for a long time, which increases the pressure of heat dissipation. Continuous high temperature operation of transformer will lead to degradation of insulation material performance, accelerated aging of insulation material and heating of coil. These problems will not only affect the performance and efficiency of transformer, but also may lead to serious safety accidents. It is very necessary to improve the heat dissipation efficiency of plate radiator and enable transformer to dissipate heat quickly to cope with long-term high load operation of transformer. Utility Model Content

[0003] The utility model provides a fast-heating oil-immersed transformer, which can improve the heat dissipation performance of a plate-type radiator and enable the transformer to dissipate heat quickly.

[0004] The utility model is achieved through the following technical solutions:

[0005] A fast heat dissipation oil-immersed transformer includes an oil tank and a plurality of plate-type radiators arranged on one side wall of the oil tank. The plate-type radiator includes an upper oil collecting pipe, a lower oil collecting pipe and a plurality of heat dissipation fins.

[0006] The upper oil collecting pipe and the lower oil collecting pipe are symmetrically arranged along the height direction of the side wall of the fuel tank. The upper oil collecting pipe is inclined downward and communicated with the upper part of the fuel tank, and the lower oil collecting pipe is communicated with the lower part of the fuel tank.

[0007] A number of heat sinks are arranged between the upper oil collecting pipe and the lower oil collecting pipe in the up-down direction. A first oil channel, a second oil channel and a third oil channel are arranged inside the heat sink in the up-down direction for allowing insulating oil to pass through. The first oil channel is arranged in the middle of the heat sink, the second oil channel is symmetrically arranged on both sides of the first oil channel, and the third oil channel is symmetrically arranged on the outside of the second oil channel with the first oil channel as the center line. The cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel and the cross-sectional area of the third oil channel increase successively. The oil inlet of the first oil channel, the oil inlet of the second oil channel and the oil inlet of the third oil channel are all connected to the upper oil collecting pipe, and the oil outlet of the first oil channel, the oil outlet of the second oil channel and the oil outlet of the third oil channel are all connected to the lower oil collecting pipe.

[0008] Furthermore, the difference between the cross-sectional area of the second oil passage and the cross-sectional area of the first oil passage is 72 mm. 2 ~117mm 2 .

[0009] Furthermore, the difference between the cross-sectional area of the third oil passage and the cross-sectional area of the second oil passage is 36 mm. 2 ~72mm 2 .

[0010] Furthermore, there are multiple third oil passages, and the cross-sectional areas of the multiple third oil passages increase in sequence from the middle to the outer edge of the heat sink, and the difference in cross-sectional area between adjacent third oil passages is 36 mm. 2 ~54mm 2 .

[0011] Furthermore, the included angle between the upper oil collecting pipe and the side wall of the oil tank is 83° to 85°.

[0012] Furthermore, the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the outermost heat sink are all larger than the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the inner heat sink.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0014] The fin-type radiator is a type of fast-heating oil-immersed transformer, comprising an oil tank and a plurality of fin-type radiators arranged on one side wall of the oil tank. The fin-type radiator comprises an upper oil collecting pipe, a lower oil collecting pipe and a plurality of fins. When the transformer is in operation, the iron core and the winding of the transformer will generate a large amount of heat during operation. The hot oil surrounds the iron core and the winding, absorbs the heat, and the temperature rises. The density of the heated hot oil decreases, and it becomes lighter and begins to rise. The hot oil rises and flows from the inclined upper oil collecting pipe to the oil channel of the fins. The inclined upper oil collecting pipe converts the potential energy of the hot oil into the initial kinetic energy of the flow. The initial flow rate of the hot oil entering the fin-type radiator gradually increases, so that the overall flow rate of the hot oil inside the fins is increased to a certain extent, thereby improving the overall heat transfer coefficient of the fin-type radiator as a whole and enhancing The heat dissipation performance of the fin type radiator is improved. As the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel and the cross-sectional area of the third oil channel of the heat sink gradually increase, the heat dissipation area from the middle to the two sides of the heat sink increases accordingly, and the hot oil flowing through the outside of the heat sink increases. The heat exchange conditions between the outer oil channel and the surrounding air are better than the heat exchange conditions between the middle oil channel and the surrounding air, so the total heat dissipation capacity increases, and the hot oil dissipates heat and cools down quickly. The cooled hot oil enters the bottom of the oil tank through the lower oil collecting pipe after cooling. With this arrangement, the total heat dissipation capacity of the fin type radiator is effectively improved by changing the inclination angle of the upper oil collecting pipe and increasing the heat dissipation area of the oil channel with good heat exchange conditions of the heat sink, so that the transformer can dissipate heat and cool down quickly to cope with long-term high-load operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a structural diagram of a rapid heat dissipation oil-immersed transformer according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of a fin-type radiator according to an embodiment of the present utility model.

[0018] Markings and corresponding parts names in the accompanying drawings:

[0019] 10-Fuel tank;

[0020] 20 - fin radiator, 21 - upper oil collecting pipe, 22 - lower oil collecting pipe, 23 - cooling fin, 231 - first oil passage, 232 - second oil passage, 233 - third oil passage. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0022] Example

[0023] See also Figure 1 、 2 A fast heat dissipation oil-immersed transformer includes an oil tank and a plurality of plate-type radiators arranged on one side wall of the oil tank. The plate-type radiator includes an upper oil collecting pipe, a lower oil collecting pipe and a plurality of heat dissipation fins.

[0024] The upper oil collecting pipe and the lower oil collecting pipe are symmetrically arranged along the height direction of the side wall of the oil tank. The upper oil collecting pipe is inclined downward and connected to the upper part of the oil tank, and the lower oil collecting pipe is connected to the lower part of the oil tank. The upper oil collecting pipe and the lower oil collecting pipe can be connected to the side wall of the oil tank by welding, or can be detachably connected to one side of the oil tank, for example, by flange connection, to improve the applicability of the device.

[0025] Several heat sinks are arranged between the upper oil collecting pipe and the lower oil collecting pipe in the up and down direction. According to relevant standards and specifications, the number of heat sinks is generally not more than 30, and the distance between each heat sink is not less than 45mm. The heat sink is made of two identical rolled or stamped steel plates welded together. The ratio of the length and width of the heat sink is 2:1 to 3:1. The thickness of the heat sink should be thin enough to facilitate heat dissipation, while also ensuring sufficient strength and stability. The thickness of the heat sink is generally between 1.5mm and 3mm. This range can provide sufficient surface area for heat dissipation and ensure the stability of the heat sink. However, the specific thickness should be selected based on comprehensive factors such as the operating environment of the transformer and the material of the heat sink. Generally speaking, folded heat sinks of aluminum alloy or copper alloy are better. In order to improve the heat dissipation efficiency, the surface of the heat sink must also be zip-pulled or painted.

[0026] A first oil channel, a second oil channel and a third oil channel are provided inside the plurality of heat sinks along the up and down directions thereof for allowing insulating oil to pass through. The first oil channel is provided in the middle of the heat sink, the second oil channel is symmetrically provided on both sides of the first oil channel, and the third oil channel is symmetrically provided on the outside of the second oil channel with the first oil channel as the center line. The cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel and the cross-sectional area of the third oil channel increase successively. The oil inlet of the first oil channel, the oil inlet of the second oil channel and the oil inlet of the third oil channel are all connected to the upper oil collecting pipe, and the oil outlet of the first oil channel, the oil outlet of the second oil channel and the oil outlet of the third oil channel are all connected to the lower oil collecting pipe.

[0027] A fast-heating oil-immersed transformer includes an oil tank and a plurality of plate-type radiators arranged on a side wall of the oil tank. The plate-type radiator includes an upper oil collecting pipe, a lower oil collecting pipe and a plurality of heat sinks. When the transformer is in operation, the iron core and windings of the transformer generate a large amount of heat during operation. Hot oil surrounds the iron core and windings, absorbs this heat, and the temperature rises. The density of the heated hot oil decreases, and it becomes lighter and begins to rise. The hot oil rises and flows from the inclined upper oil collecting pipe into the oil channel of the heat sink. The inclined upper oil collecting pipe converts the potential energy of the hot oil into the initial kinetic energy of the flow. The initial flow rate of the hot oil entering the plate-type radiator gradually increases, so that the overall flow rate of the hot oil inside the heat sink is increased to a certain extent, thereby improving the overall heat transfer coefficient of the plate-type radiator. The heat dissipation performance of the plate radiator is enhanced. As the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel and the cross-sectional area of the third oil channel of the heat sink gradually increase, the heat dissipation area from the middle to the two sides of the heat sink increases accordingly, and the hot oil flowing through the outside of the heat sink increases. The heat exchange condition between the outer oil channel and the surrounding air is better than the heat exchange condition between the middle oil channel and the surrounding air, so the total heat dissipation capacity increases, and the hot oil dissipates heat and cools down quickly. After cooling, the cooled hot oil enters the bottom of the oil tank through the lower oil collecting pipe. With this arrangement, the total heat dissipation capacity of the plate radiator is effectively improved by changing the inclination angle of the upper oil collecting pipe and increasing the heat dissipation area of the oil channel with good heat exchange on the heat sink, so that the transformer can dissipate heat and cool down quickly to cope with long-term high-load operation of the transformer.

[0028] In another embodiment, the cross-sectional area of the first oil passage is reduced by 36 mm. 2 ~54mm 2 For example, the cross-sectional dimensions of the first oil channel are 9mm×40mm, 9mm×40.5mm or 9mm×41mm. According to relevant standards and specifications, the thickness of the oil channel should not be less than 9mm, the cross-sectional dimensions of the oil channel should not be less than 9mm×45mm, or the cross-sectional area of a single oil channel should not be less than 405mm. 2 It has been verified in practice that reducing the flow of hot oil flowing through the first oil channel, thereby increasing the flow of hot oil flowing through other oil channels with better heat exchange conditions, is conducive to improving the total heat dissipation.

[0029] In another embodiment, the difference between the cross-sectional area of the second oil passage and the cross-sectional area of the first oil passage is 72 mm. 2 ~117mm 2 Preferably, the thickness of the oil channel remains unchanged. For example, the cross-sectional dimensions of the first oil channel are 9 mm × 40 mm, and the cross-sectional dimensions of the second oil channel can be 9 mm × 49 mm, 9 mm × 50 mm, or 9 mm × 52 mm. The difference between the cross-sectional area of the third oil channel and the cross-sectional area of the second oil channel is 36 mm. 2 ~72mm 2Preferably, the thickness of the oil channel remains unchanged. For example, the cross-sectional dimensions of the second oil channel are 9 mm × 50 mm, and the cross-sectional dimensions of the third oil channel may be 9 mm × 54.5 mm or 9 mm × 56.5 mm. There may be multiple third oil channels, and the cross-sectional areas of the multiple third oil channels increase from the middle to the outer edge of the heat sink. The difference in cross-sectional area between adjacent third oil channels is 36 mm. 2 ~54mm 2 Preferably, the thickness of the oil channel remains unchanged. For example, the number of third oil channels is 2. When the cross-sectional size of the third oil channel close to the second oil channel is 9mm×54mm, the cross-sectional size of the third oil channel far from the second oil channel can be 9mm×58mm. It has been verified in practice that the difference in the cross-sectional size between the above-mentioned oil channels can increase the oil volume and heat dissipation area passing through the oil channel with better heat exchange conditions, thereby effectively improving the total heat dissipation.

[0030] In another embodiment, the inclination angle of the upper oil collecting pipe continues to increase, but the effective heat dissipation area of the heat sink located in the plate-type radiator also continues to decrease, so excessively increasing the inclination angle of the upper oil collecting pipe will lead to a decrease in the total heat dissipation. A reasonable inclination angle can balance the two conflicting factors. It has been verified in practice that when the angle between the upper oil collecting pipe and the side wall of the oil tank is 80°~85°, the two conflicting factors can be balanced, which can effectively improve the total heat dissipation of the plate-type radiator.

[0031] In another embodiment, the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the outermost heat sink are all larger than the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the inner heat sink. The heat exchange condition between the outermost heat sink of the fin-type radiator and the surrounding environment is the best, and increasing its heat dissipation area can increase the total heat dissipation capacity.

[0032] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A rapid heat dissipation oil-immersed transformer, comprising an oil tank and a plurality of fin-type radiators arranged on one side wall of the oil tank, characterized in that: The fin type radiator includes an upper oil collecting pipe, a lower oil collecting pipe and a plurality of radiating fins. The upper oil collecting pipe and the lower oil collecting pipe are symmetrically arranged along the height direction of the side wall of the oil tank, the upper oil collecting pipe is inclined downward and communicated with the upper part of the oil tank, and the lower oil collecting pipe is communicated with the lower part of the oil tank; The plurality of heat sinks are all arranged between the upper oil collecting pipe and the lower oil collecting pipe in the up-down direction, and the interior of the plurality of heat sinks is provided with a first oil channel, a second oil channel and a third oil channel along the up-down direction for allowing insulating oil to pass through. The first oil channel is arranged in the middle of the heat sink, the second oil channel is symmetrically arranged on both sides of the first oil channel, and the third oil channel is symmetrically arranged on the outside of the second oil channel with the first oil channel as the center line. The cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel and the cross-sectional area of the third oil channel increase successively, the oil inlet of the first oil channel, the oil inlet of the second oil channel and the oil inlet of the third oil channel are all connected to the upper oil collecting pipe, and the oil outlet of the first oil channel, the oil outlet of the second oil channel and the oil outlet of the third oil channel are all connected to the lower oil collecting pipe.

2. A rapid heat dissipation oil-immersed transformer according to claim 1, characterized in that: The difference between the cross-sectional area of the second oil passage and the cross-sectional area of the first oil passage is 72 mm. 2 ~117mm 2 .

3. The rapid heat dissipation oil-immersed transformer according to claim 1, characterized in that: The difference between the cross-sectional area of the third oil passage and the cross-sectional area of the second oil passage is 36 mm 2 ~72mm 2 .

4. The rapid heat dissipation oil-immersed transformer according to claim 1, characterized in that: There are multiple third oil passages, and the cross-sectional areas of the multiple third oil passages increase from the middle to the outer edge of the heat sink. The difference in cross-sectional area between adjacent third oil passages is 36 mm. 2 ~54mm 2 .

5. The rapid heat dissipation oil-immersed transformer according to claim 1, characterized in that: The included angle between the upper oil collecting pipe and the side wall of the oil tank is 83° to 85°.

6. The rapid heat dissipation oil-immersed transformer according to claim 1, characterized in that: The cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the outermost heat sink are all larger than the cross-sectional area of the first oil channel, the cross-sectional area of the second oil channel, and the cross-sectional area of the third oil channel in the inner heat sink.

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