Dry-type power transformer cooling device

Abstract

The utility model provides a cooling device for a dry-type power transformer, and aims to solve the problems that the existing dry-type power transformer possibly cannot effectively dissipate heat generated by a coil in time, so that the temperature of the transformer is increased, the performance and the service life of the transformer are influenced, and in addition, when the dry-type transformer is in an extreme environment or is abnormal, the temperature of the transformer is increased. In order to solve the problems of overheating and even burning of a transformer caused by lack of an effective emergency cooling mechanism in the prior art, the utility model provides the following scheme: the transformer comprises an iron core mechanism, a plurality of coil assemblies and a plurality of shells, and further comprises a plurality of cooling mechanisms, and the cooling mechanisms sleeve the outer sides of the corresponding coil assemblies; the cooling mechanism comprises a first upper annular plate, a second upper annular plate, a first lower annular plate, a second lower annular plate and two liquid collecting tanks. The cooling mechanism is divided into the two sub-mechanisms, the two sub-mechanisms work at intervals, so that cooling liquid has sufficient cooling time, the cooling efficiency of the cooling mechanism is guaranteed, and the two sub-mechanisms can work at the same time to rapidly cool the coil assembly when encountering extreme conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a dry-type power transformer cooling device. Background Art

[0002] Transformers, as an important power conversion equipment, are widely used in power transmission and distribution. Traditional transformers mainly include oil-immersed transformers and dry-type transformers. Although oil-immersed transformers perform better in cooling efficiency, they have potential environmental pollution and safety risks. Dry-type power transformers are power transformers that do not use liquid coolants but use air or solid insulating materials to isolate and cool the coils. Using air or solid insulating materials instead of traditional oil-immersed insulation systems reduces the impact on the environment, reduces fire risks, and avoids oil pollution problems.

[0003] Existing dry-type power transformers may not be able to effectively dissipate the heat generated by the coil in a timely manner, causing the temperature of the transformer to rise, affecting the performance and life of the transformer. In addition, dry-type transformers lack an effective emergency cooling mechanism in extreme environments or when abnormalities occur, resulting in overheating or even burning of the transformer. Therefore, we propose a dry-type power transformer cooling device to solve this problem. Utility Model Content

[0004] The purpose of the utility model is to solve the problems raised in the above background technology and to propose a dry-type power transformer cooling device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A dry-type power transformer cooling device comprises an iron core mechanism, multiple coil groups and multiple shells, and also comprises multiple cooling mechanisms, wherein the cooling mechanisms are sleeved on the outside of the corresponding coil groups and are used to extract heat from the coil groups, the cooling mechanisms comprise an upper ring plate 1, an upper ring plate 2, a lower ring plate 1, a lower ring plate 2 and two liquid collecting tanks, a plurality of first conduits are connected between the upper ring plate 1 and the lower ring plate 1, a plurality of second conduits are connected between the upper ring plate 2 and the lower ring plate 2, a first long tube and a second long tube are respectively connected between the multiple upper ring plates 1 and the multiple upper ring plates 2, a first short tube and a second short tube are respectively connected between the multiple lower ring plates 1 and the multiple lower ring plates 2, the first long tube and the first short tube are both connected to the liquid collecting tank located on the front side, and the second long tube and the second short tube are both connected to the liquid collecting tank located on the rear side.

[0007] Preferably, a liquid storage chamber and a storage chamber are provided in the liquid collecting tank, the liquid storage chamber is filled with coolant, a heat sink is provided on the top of the liquid collecting tank, the bottom of the heat sink is connected to the top inner wall of the liquid storage chamber, a circulation pump is provided in the storage chamber, and control valves are provided in the first long tube, the second long tube, the first short tube and the second short tube.

[0008] Preferably, the first conduit passes through the corresponding upper ring plate 2, the second conduit passes through the corresponding lower ring plate 1, and the connection between the first conduit and the upper ring plate 2 and the connection between the second conduit and the lower ring plate 1 are both sealed.

[0009] Preferably, the plurality of first conduits and second conduits provided outside the coil group are arranged at intervals in a circumferential manner, and the outer sides of the first conduits and the second conduits are fixedly sleeved with heat conducting plates, which are movably abutted against the outer walls of the corresponding coil groups.

[0010] Preferably, the coil group includes a low-voltage coil, a high-voltage coil and an insulating layer, and the top and bottom of the low-voltage coil, the high-voltage coil and the insulating layer are fixedly connected with multiple insulating connectors. A support frame is provided below the coil group, and the support frame is fixedly connected to the insulating connector located below.

[0011] Preferably, the shell is slidably sleeved on the outer side of the corresponding cooling mechanism, and the shell is fixedly connected to the support frame through a connecting plate.

[0012] The beneficial effects of the utility model are:

[0013] 1. The circulating pump in the liquid collection tank cooperates with the first long tube to pump the coolant into the upper ring plate 1. The coolant then flows into the lower ring plate 1 through multiple first conduits. The coolant effectively removes heat from the coil group through the cooperation of the first conduits and the heat conducting plate. Compared with air cooling, liquid cooling systems can generally achieve higher heat dissipation capacity in a smaller space. By controlling the flow rate and temperature of the coolant, the operating temperature of the coil can be precisely controlled to ensure equipment stability and performance.

[0014] 2. By dividing the cooling mechanism into two sub-mechanisms, the two sub-mechanisms operate at intervals so that the coolant has sufficient cooling time, thereby ensuring the cooling efficiency of the cooling mechanism. When encountering extreme conditions, the two sub-mechanisms can operate simultaneously to quickly cool down the coil group. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of a dry-type power transformer cooling device proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of a cooling mechanism of a dry-type power transformer cooling device proposed in the present invention;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of a coil group of a dry-type power transformer cooling device proposed by the utility model;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of an upper ring plate 1 of a dry-type power transformer cooling device proposed by the present invention.

[0019] The accompanying drawings are marked as follows: 1. iron core mechanism; 2. coil group; 3. shell; 4. cooling mechanism; 5. upper ring plate 1; 6. upper ring plate 2; 7. lower ring plate 1; 8. lower ring plate 2; 9. liquid collecting tank; 10. first conduit; 11. second conduit; 12. first long tube; 13. second long tube; 14. first short tube; 15. heat conducting plate; 16. low-voltage coil; 17. high-voltage coil; 18. insulation layer; 19. support frame. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figures 1-4 A dry-type power transformer cooling device includes an iron core mechanism 1, multiple coil groups 2 and multiple shells 3, and also includes multiple cooling mechanisms 4, which are sleeved on the outside of the corresponding coil groups 2 to extract heat from the winding groups. The cooling mechanism 4 includes an upper ring plate 1 5, an upper ring plate 2 6, a lower ring plate 1 7, a lower ring plate 2 8 and two liquid collecting tanks 9. A plurality of first conduits 10 are connected between the upper ring plate 1 5 and the lower ring plate 1 7, and a plurality of second conduits 11 are connected between the upper ring plate 2 6 and the lower ring plate 2 8. A first long tube 12 and a second long tube 13 are respectively connected between the multiple upper ring plates 1 5 and the multiple upper ring plates 2 6, and a first short tube 14 and a second short tube are respectively connected between the multiple lower ring plates 1 7 and the multiple lower ring plates 2 8. The first long tube 12 and the first short tube 14 are both connected to the liquid collecting tank 9 on the front side, and the second long tube 13 and the second short tube are both connected to the liquid collecting tank 9 on the rear side.

[0022] like Figure 1 and Figure 2 As shown, a liquid storage chamber and a storage chamber are provided in the liquid collecting tank 9, the liquid storage chamber is filled with coolant, a heat sink is provided on the top of the liquid collecting tank 9, the bottom of the heat sink is connected to the top inner wall of the liquid storage chamber, a circulation pump is provided in the storage chamber, and control valves are provided in the first long tube 12, the second long tube 13, the first short tube 14 and the second short tube.

[0023] It should be noted that the input end of the circulation pump in the front liquid collection tank 9 is connected to the liquid storage cavity, and the coolant is pumped from the liquid collection tank 9, flowing through the first long pipe 12, the first upper ring plate 5, the first conduit 10, the first lower ring plate 7 and the first short pipe 14 and then returning to the liquid collection tank 9. The circulation pump can adjust the flow rate and pressure according to the system requirements to ensure the continuous circulation of the coolant. When the coolant returns to the liquid collection tank 9, the heat dissipation plate is directly in contact with the coolant, and the heat dissipation plate is cooled by natural air convection or an auxiliary fan, thereby effectively reducing the temperature of the coolant.

[0024] It should be further noted that by controlling the control valves in the first long pipe 12, the second long pipe 13, the first short pipe 14 and the second short pipe, it can be ensured that the coolant can completely flow into the interior of the box when needed. As Figure 4 shown, the first conduit 10 penetrates through the corresponding second upper ring plate 6, and the second conduit 11 penetrates through the corresponding first lower ring plate 7. The connections between the first conduit 10 and the second upper ring plate 6 and between the second conduit 11 and the first lower ring plate 7 are both sealed.

[0025] As Figure 3 shown, a plurality of first conduits 10 and second conduits 11 provided outside the coil group 2 are arranged at circumferential intervals. Heat dissipation plates 15 are fixedly sleeved on the outer sides of the first conduits 10 and the second conduits 11, and the heat dissipation plates 15 are movably abutted against the outer walls of the corresponding coil groups 2.

[0026] It should be noted that the plurality of heat dissipation plates 15 are closely arranged in a circle, and the heat dissipation plates 15 are closely fitted to the coils, which can effectively transfer the heat on the surface of the coils to the coolant and improve the heat dissipation efficiency. As Figure 1 and Figure 3 shown, the coil group 2 includes a low-voltage coil 16, a high-voltage coil 17 and an insulating layer 18. A plurality of insulating connectors are fixedly connected to the tops and bottoms of the low-voltage coil 16, the high-voltage coil 17 and the insulating layer 18. A support frame 19 is provided below the coil group 2, and the support frame 19 is fixedly connected to the insulating connectors located below.

[0027] The outer shell 3 is slidably sleeved on the outside of the corresponding cooling mechanism 4, and the outer shell 3 is fixedly connected to the support frame 19 through a connecting plate.

[0028] The working principle of the present utility model is as follows: The cooling mechanism 4 includes two sub-mechanisms. The first sub-mechanism includes an upper ring plate 5, a lower ring plate 7, a first long tube 12, a first short tube 14, a liquid collection tank 9, and a plurality of first conduits 10. The second sub-mechanism includes an upper ring plate 6, a lower ring plate 8, a second long tube 13, a second short tube, a liquid collection tank 9, and a plurality of second conduits 11. Taking the first sub-mechanism as an example, the circulation pump in the liquid collection tank 9 pumps the coolant into the upper ring plate 5 through cooperation with the first long tube 12. The coolant flows into the lower ring plate 7 through a plurality of first conduits 10. The coolant effectively takes away the heat on the coil group 2 through the cooperation of the first conduit 10 and the heat conduction plate 15. The coolant in the lower ring plate 7 returns to the liquid collection tank 9 through the first short tube 14. The heat dissipation plate cools down the coolant. After circulating multiple times, the temperature of the coolant will continue to rise, resulting in a decrease in the cooling efficiency. After the first sub-mechanism operates for a period of time, the circulation pump pumps all the coolant back into the liquid collection tank 9. At the same time, the second sub-mechanism performs the same cooling operation as the first sub-mechanism. The coolant in the first sub-mechanism can obtain a longer cooling time. The interval operation of the two sub-mechanisms ensures the cooling efficiency of the cooling mechanism 4. When encountering extreme situations, the two sub-mechanisms can operate simultaneously to quickly cool down the coil group 2.

[0029] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A dry-type power transformer cooling device, comprising an iron core mechanism (1), a plurality of coil assemblies (2) and a plurality of housings (3), characterized in that: The device further comprises a plurality of cooling mechanisms (4), wherein the cooling mechanisms (4) are sleeved on the outside of the corresponding coil group (2) and are used to extract heat from the coil group. The cooling mechanisms (4) comprise an upper ring plate 1 (5), an upper ring plate 2 (6), a lower ring plate 1 (7), a lower ring plate 2 (8) and two liquid collecting tanks (9). A plurality of first conduits (10) are connected between the upper ring plate 1 (5) and the lower ring plate 1 (7), and a plurality of second conduits ( 11), a first long tube (12) and a second long tube (13) are respectively connected between the plurality of upper ring plates (5) and the plurality of upper ring plates (6), a first short tube (14) and a second short tube are respectively connected between the plurality of lower ring plates (7) and the plurality of lower ring plates (8), the first long tube (12) and the first short tube (14) are both connected to the liquid collecting tank (9) located at the front side, and the second long tube (13) and the second short tube are both connected to the liquid collecting tank (9) located at the rear side.

2. A dry-type power transformer cooling device according to claim 1, characterized in that: The liquid collecting tank (9) is provided with a liquid storage cavity and a storage cavity, the liquid storage cavity is filled with coolant, a heat sink is provided on the top of the liquid collecting tank, the bottom of the heat sink is connected to the top inner wall of the liquid storage cavity, a circulation pump is provided in the storage cavity, and the first long tube (12), the second long tube (13), the first short tube (14) and the second short tube are all provided with control valves.

3. A dry-type power transformer cooling device according to claim 1, characterized in that: The first conduit (10) passes through the corresponding upper ring plate 2 (6), and the second conduit (11) passes through the corresponding lower ring plate 1 (7). The connection between the first conduit (10) and the upper ring plate 2 (6) and the connection between the second conduit (11) and the lower ring plate 1 (7) are both sealed.

4. A dry-type power transformer cooling device according to claim 1, characterized in that: A plurality of first conduits (10) and second conduits (11) are arranged at intervals on a circumference on the outside of the coil group (2); a heat conducting plate (15) is fixedly sleeved on the outside of each of the first conduits (10) and the second conduits (11); the heat conducting plate (15) is movably abutted against the outer wall of the corresponding coil group (2).

5. The dry-type power transformer cooling device according to claim 1, characterized in that: The coil group (2) comprises a low-voltage coil (16), a high-voltage coil (17) and an insulating layer (18), wherein the tops and bottoms of the low-voltage coil (16), the high-voltage coil (17) and the insulating layer (18) are fixedly connected with a plurality of insulating connectors, and a support frame (19) is provided below the coil group (2), and the support frame (19) is fixedly connected to the insulating connectors located below.

6. A dry-type power transformer cooling device according to claim 5, characterized in that: The outer shell (3) is slidably sleeved on the outer side of the corresponding cooling mechanism (4), and the outer shell (3) is fixedly connected to the support frame (19) via a connecting plate.

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