A cooling oil immersed transformer

Abstract

The present invention discloses a cooling type oil-immersed transformer, comprising an oil-immersed transformer body, an oil storage tank arranged on the oil-immersed transformer body and providing cooling oil therein, and a heat dissipation fin plate arranged on the outer peripheral wall of the oil-immersed transformer body; wherein an air bag for adjusting the oil pressure and a heat exchange unit for cooling the cooling oil are arranged in the oil storage tank. In the present invention, a cooling and heat exchange shell for the transformer oil is installed in the oil storage tank, and specifically a phase change material is filled in the cooling and heat exchange shell, so that the transformer oil during the peak period of electricity consumption is effectively cooled quickly to ensure the safe operation of the equipment. In addition, a first purge pipe for downward purge is installed on the heat dissipation fin plate outside the oil-immersed transformer body, and a second purge pipe is also passed through the heat dissipation fin plate, and a purge jet hole is opened on the outer peripheral wall of the second purge pipe, so that the dust attached between the heat dissipation fin plates is purged from multiple angles, so as to ensure its cleanliness, which is conducive to improving the heat dissipation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of transformer equipment, and in particular to a cooled oil-immersed transformer. Background Art

[0002] An oil-immersed transformer is a transformer that immerses the transformer body in an oil tank. It uses oil as the main insulation means of the transformer and relies on oil as a cooling medium for cooling. In addition, the oil in the oil tank can also protect the core and windings from the influence of moisture in the air. Therefore, oil-immersed transformers are currently a popular type of transformer. However, the oil tank used in traditional oil-immersed transformers relies on the change in the temperature of the oil medium itself to flow, and its flow effect is poor, so it at least has problems such as poor cooling effect.

[0003] Although, in the prior art, for example, Chinese patent CN208045258U discloses an oil-immersed transformer, which extends the stirring end of the anti-settling device into the transformer body, and can stir the insulating oil in the transformer body by rotating the stirring end, thereby improving the flow effect and heat dissipation effect of the insulating oil, but because the stirring end generates a certain amount of heat due to friction when stirring the insulating oil, the cooling effect of the insulating oil is biased.

[0004] In addition, the existing oil-immersed transformer mainly relies on the heat sink on the outer wall of the box to dissipate heat. Although the heat dissipation effect can be improved by increasing the heat dissipation area, the heat dissipation effect is relatively limited and the efficiency is low. In addition, the transformer oil in the box has poor fluidity, which affects the thermal conductivity. In addition, the external heat sink is distributed in parallel. If it is not cleaned for a long time, a layer of dust will inevitably form on the surface of the heat sink, thereby affecting the heat dissipation efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a cooled oil-immersed transformer to solve the problem that the heat dissipation efficiency of the transformer cooling oil is not high enough during the use of the conventional oil-immersed transformer.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a cooling oil-immersed transformer, comprising an oil-immersed transformer body, an oil storage tank arranged on the oil-immersed transformer body and providing cooling oil therein, and a heat dissipation fin plate arranged on the outer peripheral wall of the oil-immersed transformer body;

[0008] An air bag for adjusting the oil pressure and a heat exchange unit for cooling the cooling oil are arranged in the oil storage tank;

[0009] A purge pipe for blowing away dust is arranged on the heat dissipation fin plate.

[0010] Furthermore, a base is provided at the bottom of the oil-immersed transformer body.

[0011] Furthermore, the oil storage tank is a hollow cavity structure, and a first pipeline interface and a second pipeline interface are provided on the oil storage tank, wherein the first pipeline interface is communicated with the interior of the oil storage tank, and the second pipeline interface is sealed and communicated with the airbag; the first pipeline interface and the second pipeline interface are both sealed and communicated with a connecting pipe; the connecting pipe is connected to a dryer through a connecting pipe;

[0012] An oil tank pipe connected to the inside of the oil-immersed transformer body is arranged at the bottom of the oil storage tank; an oil level gauge is also arranged at the end side of the oil storage tank.

[0013] Furthermore, the heat exchange unit includes a plurality of cooling and heat exchange shells evenly spaced inside the oil storage tank;

[0014] The cooling and heat exchange shell is a flat structure;

[0015] A hollow cooling cavity is reserved in the cooling and heat exchanging shell, wherein the hollow cooling cavity is filled with a phase change material;

[0016] The top of each of the cooling and heat exchange shells is connected to the outside of the oil storage tank through a pressure relief pipe, and a pressure relief valve is arranged at the outer end of the pressure relief pipe.

[0017] Furthermore, a feeding pipe extending out of the oil storage tank is respectively provided at the bottom or the side wall of the cooling and heat exchange shell; wherein the oil storage tank is sealedly connected to the feeding pipe.

[0018] Furthermore, the cross-section of the airbag is crescent-shaped.

[0019] Furthermore, the two side walls of the cooling and heat exchange shell are fixedly arranged on the inner wall of the oil storage tank.

[0020] Furthermore, a plurality of the first purge pipes are arranged above the heat dissipation fins through a bracket, wherein the jet end of each of the first purge pipes faces the gap between adjacent heat dissipation fins; and the plurality of the first purge pipes are connected to a pulse air pipe.

[0021] Furthermore, a second purge pipe is passed through the center of the heat dissipation fin plate, and a plurality of purge jet holes are evenly opened on the outer peripheral wall of the second purge pipe, and the second purge pipe is connected to the pulse air pipe.

[0022] Furthermore, the air inlet end of the pulse air pipe and the air inlet end of the second purge pipe are detachably connected to the air pump through air inlet connecting pipes.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are:

[0024] In the present invention, a cooling and heat exchange shell for transformer oil is installed in the oil storage tank, and specifically a phase change material is filled in the cooling and heat exchange shell, so that the transformer oil during the peak period of electricity consumption is effectively cooled quickly to ensure the safe operation of the equipment. In addition, a first purge pipe for downward sweeping is installed on the heat dissipation fin plate outside the oil-immersed transformer body, and a second purge pipe is also penetrated through the heat dissipation fin plate, and a purge jet hole is opened on the outer peripheral wall of the second purge pipe, so that the dust attached between the heat dissipation fin plates is swept from multiple angles, so as to ensure its cleanliness, which is conducive to improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the main structure of the cooling oil-immersed transformer in Example 1;

[0027] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the oil storage tank in Example 1;

[0028] Figure 3 This is a schematic diagram of the internal structure of the oil storage tank in Example 1;

[0029] Figure 4 This is a schematic diagram of the end side of the oil storage tank in Example 1;

[0030] Figure 5 This is a schematic diagram of the arrangement structure of the first purge pipe on the heat dissipation fin plate in Example 2;

[0031] Figure 6 This is a schematic diagram of the arrangement structure of the second purge pipe on the heat dissipation fin plate in Example 3;

[0032] Figure 7 For Example 3 Figure 6 Schematic side view of the structure.

[0033] Explanation of the reference numerals: 1. oil-immersed transformer body; 101. base; 102. heat dissipation fins; 2. oil storage tank; 201. oil tank pipe; 202. air bag; 203. connecting pipe; 204. dryer; 205. oil level gauge; 206. cooling and heat exchange shell; 2061. feeding pipe; 207. phase change material; 208. pressure relief pipe; 209. pressure relief valve; 3. air pump; 301. pulse air pipe; 4. first purge pipe; 401. bracket; 402. second purge pipe; 4021. purge jet hole. DETAILED DESCRIPTION Example 1

[0034] like Figure 1As shown, in this embodiment, a cooling oil-immersed transformer is disclosed, comprising an oil-immersed transformer body 1, an oil storage tank 2 mounted on the oil-immersed transformer body 1 through a bracket and providing cooling oil therein, and a heat dissipation fin plate 102 mounted on the outer peripheral wall of the oil-immersed transformer body 1. An air bag 202 for adjusting oil pressure and a heat exchange unit for cooling the cooling oil are installed in the oil storage tank 2. A purge pipe for blowing dust is installed on the heat dissipation fin plate 102. In specific implementation, a base 101 is installed at the bottom of the oil-immersed transformer body 1.

[0035] In this embodiment, Figure 2 As shown, the oil storage tank 2 is a hollow cavity structure, and a first pipeline interface and a second pipeline interface are installed on the oil storage tank 2, wherein the first pipeline interface is connected to the interior of the oil storage tank 2, and the second pipeline interface is sealed and connected to the airbag 202; the first pipeline interface and the second pipeline interface are both sealed and connected to a connecting pipe 203; the connecting pipe 203 is connected to a dryer 204 through a connecting pipe; valves are respectively installed on the first pipeline interface and the second pipeline interface, specifically electromagnetic valves for anti-electromagnetic interference, wherein an oil tank pipe 201 connected to the interior of the oil-immersed transformer body 1 is installed at the bottom of the oil storage tank 2; an oil level gauge 205 is also installed on the end side of the oil storage tank 2 for detecting the liquid level depth in the oil storage tank 2.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, the heat exchange unit includes a plurality of cooling and heat exchange shells 206 evenly spaced and installed inside the oil storage tank 2; the cooling and heat exchange shells 206 are flat structures; a hollow cooling cavity is reserved in the cooling and heat exchange shell 206, wherein the hollow cooling cavity is filled with a phase change material 207; the phase change material 207 is a mixture of one or more of a wax phase change material, a polymer phase change material, and a salt phase change material, and its phase change temperature can be adjusted between 10°C and 80°C, and has good thermal stability and reliability. The top of each cooling and heat exchange shell 206 is connected to the outside of the oil storage tank 2 through a pressure relief pipe 208, and a pressure relief valve 209 is installed at the outer end of the pressure relief pipe 208; wherein the hollow cooling cavity is not filled with the phase change material 207 to reserve the physical changes when the phase change material is deformed. The pressure relief pipe 208 and the pressure relief valve 209 are used to deal with the rapid change in expansion volume when the phase change material is violently deformed in an emergency.

[0037] In this embodiment, Figure 4As shown, a feeding pipe 2061 extending out of the oil storage tank 2 is installed at the bottom or side wall of the cooling and heat exchange shell 206; the oil storage tank 2 is sealedly connected to the feeding pipe 2061; the feeding pipe 2061 replenishes the required phase change material into the cooling and heat exchange shell 206. The cross section of the airbag 202 is a crescent shape, and the upper surface of the airbag 202 can fit the inner wall of the oil storage tank 2 to effectively bear pressure. The two side walls of the cooling and heat exchange shell 206 are fixedly installed on the inner wall of the oil storage tank 2.

[0038] During the peak period of electricity consumption, it is necessary to start circulating cooling of the cooling oil in the oil-immersed transformer body 1; first, specifically, a temperature sensor is installed in the oil-immersed transformer body 1; a delivery pump or a circulation pump providing circulation power is installed inside the oil-immersed transformer body 1, and specifically, an electrically controlled circulation pump can also be installed on the oil tank pipe 201; the cooling oil inside the oil-immersed transformer body 1 enters the oil storage tank 2 through the oil tank pipe 201, and after entering the oil storage tank 2, if the temperature of the cooling oil rises (according to the detection data of the temperature sensor), the heat of the cooling oil can be transferred to the phase change material 207 in the cooling and heat exchange shell 206 by fully contacting with the cooling and heat exchange shell 206 in the oil storage tank 2, so that the phase change material 207 changes phase and absorbs heat.

[0039] During the low-peak period of electricity consumption, the circulating cooling pipeline for the cooling oil in the oil-immersed transformer body 1 is closed; specifically, the delivery pump or circulation pump installed inside the oil-immersed transformer body 1 for providing circulation power is closed, and the transformer oil is cooled by the heat dissipation fins 102; at the same time, the phase change material 207 in the cooling and heat exchange shell 206 gradually releases heat to the external environment after absorbing heat, so that the phase change material 207 is cooled again and deformed, and enters a heat absorption waiting state. Example 2

[0040] On the basis of Example 1, in this embodiment, Figure 5 As shown, a plurality of the first purge tubes 4 are installed above the heat dissipation fin plate 102 through a bracket 401, wherein the jet end of each of the first purge tubes 4 faces the gap between the adjacent heat dissipation fin plates 102; and a plurality of the first purge tubes 4 are connected to a pulse air pipe 301. When in use, the air inlet end of the pulse air pipe 301 is detachably connected to the air pump 3 through an air inlet connecting pipe; wherein the air pump 3 can be directly equipped on the base of the oil-immersed transformer 1; or, the air inlet connecting pipe is retained, and the air pump is used to purge regularly as needed, so as to ensure the cleanliness of the inner wall of the heat dissipation fin plate 102, thereby ensuring the improvement of the heat dissipation efficiency of the heat dissipation fin plate 102. Example 3

[0041] In the technology of Example 2, in this embodiment, as Figure 6 and Figure 7 As shown, a second purge pipe 402 runs through the center of the heat dissipating fin plate 102, and a plurality of purge jet holes 4021 are evenly opened on the outer peripheral wall of the second purge pipe 402, and the second purge pipe 402 is connected to the pulse air pipe 301. The air inlet ends of the second purge pipe 402 are detachably connected to the air pump 3 through the air inlet connecting pipes. The air pump 3 can be directly equipped on the base of the oil-immersed transformer 1; or, the air inlet connecting pipe is retained, and the air pump is used for regular purge as needed to ensure the cleanliness of the inner wall of the heat dissipating fin plate 102, thereby ensuring that the heat dissipation efficiency of the heat dissipating fin plate 102 is improved. In this embodiment, the pulse air pipe 301 and the second purge pipe 402 with the purge jet holes 4021 work together to clean the surface of the heat dissipating fin plate 102.

[0042] The above embodiments are only descriptions of the preferred methods of the invention, and are not intended to limit the scope of the invention. Without departing from the design spirit of the invention, various modifications and improvements made to the technical solutions of the invention by ordinary technicians in this field should fall within the protection scope of the claims of the invention.

Claims

1. A cooling oil-immersed transformer, comprising an oil-immersed transformer body (1), an oil storage tank (2) arranged on the oil-immersed transformer body (1) and providing cooling oil therein, and a heat dissipation fin plate (102) arranged on the outer peripheral wall of the oil-immersed transformer body (1), characterized in that: An air bag (202) for adjusting the oil pressure and a heat exchange unit for cooling the cooling oil are arranged in the oil storage tank (2); A purge pipe for blowing away dust is arranged on the heat dissipation fin plate (102); a plurality of first purge pipes (4) are arranged above the heat dissipation fin plate (102) via a bracket (401), wherein the jet end of each of the first purge pipes (4) faces the gap between adjacent heat dissipation fin plates (102); The heat exchange unit comprises a plurality of cooling and heat exchange shells (206) arranged at even intervals inside the oil storage tank (2); The cooling and heat exchange shell (206) is a flat structure; A hollow cooling cavity is reserved in the cooling and heat exchange shell (206), wherein the hollow cooling cavity is filled with a phase change material (207); the phase change material (207) is a mixture of one or more of a wax phase change material, a polymer phase change material, and a salt phase change material; The top of each of the cooling and heat exchange shells (206) is connected to the outside of the oil storage tank (2) via a pressure relief pipe (208), and a pressure relief valve (209) is provided at the outer end of the pressure relief pipe (208); During the peak period of electricity consumption, the cooling oil inside the oil-immersed transformer body (1) enters the oil storage tank (2) through the oil tank pipe (201), and absorbs heat through phase change through the cooling and heat exchange shell (206) inside the oil storage tank (2); During the low-peak period of electricity consumption, the electrically controlled circulation pump installed on the oil tank pipe (201) is controlled to be turned off; and the phase change material (207) in the cooling and heat exchange shell (206) gradually releases heat to the external environment and then enters a heat absorption waiting state.

2. The cooled oil-immersed transformer according to claim 1, characterized in that: A base (101) is provided at the bottom of the oil-immersed transformer body (1).

3. The cooled oil-immersed transformer according to claim 1, characterized in that: The oil storage tank (2) is a hollow cavity structure, and is provided with a first pipeline interface and a second pipeline interface on the oil storage tank (2), wherein the first pipeline interface is in communication with the interior of the oil storage tank (2), and the second pipeline interface is in sealed communication with the airbag (202); the first pipeline interface and the second pipeline interface are both in sealed communication with a connecting pipe (203); the connecting pipe (203) is connected to a dryer (204) via a connecting pipe; An oil tank pipe (201) connected to the inside of the oil-immersed transformer body (1) is arranged at the bottom of the oil storage tank (2); and an oil level gauge (205) is also arranged at the end side of the oil storage tank (2).

4. The cooled oil-immersed transformer according to claim 1, characterized in that: A feeding pipe (2061) extending out of the oil storage tank (2) is provided at the bottom or side wall of the cooling and heat exchange shell (206); and the oil storage tank (2) is sealedly connected to the feeding pipe (2061).

5. The cooled oil-immersed transformer according to claim 4, characterized in that: The cross-section of the airbag (202) is crescent-shaped.

6. The cooled oil-immersed transformer according to claim 5, characterized in that: The two side walls of the cooling and heat exchange shell (206) are fixedly arranged on the inner wall of the oil storage tank (2).

7. The cooled oil-immersed transformer according to claim 1, characterized in that: The plurality of first purge pipes (4) are connected to a pulse air pipe (301).

8. The cooled oil-immersed transformer according to claim 7, characterized in that: A second purge pipe (402) passes through the center of the heat dissipation fin plate (102), a plurality of purge jet holes (4021) are evenly arranged on the outer peripheral wall of the second purge pipe (402), and the second purge pipe (402) is connected to the pulse air pipe (301).

9. The cooled oil-immersed transformer according to claim 8, characterized in that: The air inlet end of the pulse air pipe (301) and the air inlet end of the second purge pipe (402) are respectively detachably connected to the air pump (3) via air inlet connecting pipes.

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