Dry-type transformer cooling structure

Abstract

The utility model relates to a kind of dry-type transformer cooling structure, including body body and base, wherein base two sides are equipped with refrigeration plant, middle part is equipped with air guide seat, and the air guide seat two sides are equipped with air inlet respectively with the refrigeration plant of corresponding side sealed communication;Body body includes iron core, and the iron core includes core column, the core column outside is successively equipped with inner layer coil and outer layer coil, the air guide seat inside is equipped with coil cushion block, and the inner layer coil is supported by coil cushion block, and the outer layer coil is supported by the air guide seat side wall of air guide seat;The air guide seat lower end is equipped with the core column plug-in hole for the core column passes through.The utility model utilizes air guide seat to realize the intercommunication cooperation of refrigeration plant and body body inside, can realize the purpose of efficient cooling, and overall structure is compact.

Description

Technical Field

[0001] This utility model relates to the field of transformers, specifically a cooling structure for dry-type transformers. Background Technology

[0002] A dry-type transformer is an electrical device that does not require insulating oil. Its hardware structure mainly includes the following key components: 1. The core, usually made of stacked silicon steel sheets, which provides the magnetic circuit and reduces eddy current losses; 2. The windings, which are the energy conversion part of the transformer, are made of wires (usually copper or aluminum) and are divided into primary and secondary windings. The primary winding is connected to the power source, and the secondary winding is connected to the load. In addition, the insulation system of a dry-type transformer is also one of the important characteristics that distinguishes it from an oil-immersed transformer.

[0003] The most common cooling method for dry-type transformers is air cooling. Existing air cooling technology mainly involves installing a fan at the bottom of the transformer, allowing airflow to pass through the gaps formed by the coils for heat dissipation. However, the airflow reaching the top in this way is often at a higher temperature, which affects the heat dissipation effect at the top. This causes the top coils to operate in a high-temperature environment for a long time, which can easily lead to damage.

[0004] In addition, dry-type transformers also use heat pipe technology or water cooling technology for cooling. The purpose of these methods is to dissipate heat from the coils more effectively and improve the reliable operation of the transformer. However, the above methods are usually relatively complex in structure. For example, CN212342426U patent discloses a cooling device for a dry-type transformer, in which cooling water pipes are evenly arranged between two adjacent sets of equipment. The cooling water pipes need to be equipped with water delivery pipes, water pumps, water tanks and other devices. Utility Model Content

[0005] The purpose of this utility model is to provide a cooling structure for a dry-type transformer, which utilizes an air guide seat to achieve communication and coordination between the cooling device and the transformer body, thereby achieving efficient cooling and having a compact overall structure.

[0006] The objective of this utility model is achieved through the following technical solution: A cooling structure for a dry-type transformer includes a transformer body and a base. The base has cooling devices on both sides and an air guide seat in the middle. Air inlets on both sides of the air guide seat are sealed and connected to the corresponding cooling devices. The transformer body includes an iron core, and the iron core includes a core column. An inner coil and an outer coil are sequentially fitted around the core column. A coil pad is provided inside the air guide seat, and the inner coil is supported by the coil pad, while the outer coil is supported by the side wall of the air guide seat. A core column insertion hole is provided at the lower end of the air guide seat for the core column to pass through.

[0007] The air guide seat includes a support base plate, and the upper edge of the support base plate is provided with the air guide seat sidewall along the circumferential direction. The support base plate is provided with the core column insertion hole in the middle. In addition, each coil pad is provided on the support base plate.

[0008] Each coil pad is arranged circumferentially along the core insertion hole.

[0009] The inner side wall of the air guide seat is provided with multiple toothed blocks along the circumference.

[0010] The housing of the refrigeration device is provided with multiple refrigeration air outlets, and the air inlet on the lower side of the air guide seat is sealed and inserted into the corresponding refrigeration air outlet on the corresponding side of the refrigeration device.

[0011] The base includes a bottom frame, and two limiting beams are provided in the middle of the bottom frame. A core column support beam is provided on the lower side of the two limiting beams. The cooling device is provided on the outer side of the limiting beams. The lower side of the air guide seat is supported by the cooling devices on both sides and the two limiting beams. The lower end of the core column passes through the core column insertion hole of the corresponding air guide seat and is placed between the two limiting beams and supported by the core column support beam.

[0012] The core support beam has a bottom support beam on its lower side, and the bottom of the refrigeration device is supported by the bottom support beam.

[0013] A limiting beam pad is provided between the lower side of the limiting beam and the core column support beam, and a core column pad is provided between the lower end of the core column and the core column support beam.

[0014] A temperature sensor is provided at the upper end of the inner coil.

[0015] The advantages and positive effects of this utility model are as follows: 1. This utility model is equipped with an air guide seat and a cooling device on the base. The air guide seat supports the transformer body and also enables the cooling device to connect and cooperate with the inside of the transformer body. The cold air generated by the cooling device has a relatively low temperature and a pressure difference with the outside air. Under the action of this pressure difference, the cold air can quickly flow through the air guide seat into the transformer body and flow rapidly from bottom to top inside the transformer body, thereby achieving the purpose of efficient cooling of the transformer.

[0016] 2. This utility model utilizes the coil pads inside the air guide seat to support the inner coil of the transformer body, and the side wall of the air guide seat to support the outer coil of the transformer body. This ensures the proper setting of the coil gap between the inner and outer coils. At the same time, the outer wall of the air guide seat side wall and the outer wall of the outer coil are connected to form the same surface, which ensures the simple and beautiful appearance of the transformer product and the sealing of the air guide seat side wall. The diameter of the core column of the transformer body core matches the diameter of the core column insertion hole in the middle of the air guide seat support base plate to ensure the sealing of the air guide seat support base plate, thereby ensuring that a sealed cavity is formed inside the air guide seat to guide the flow of cold air.

[0017] 3. In order to cooperate with the installation of the air guide seat and the refrigeration device, the base of this utility model also includes a bottom frame. The bottom frame includes structures such as a limiting beam, a core column support beam, and a bottom support beam. While ensuring that the entire device is firmly supported, it also makes the overall structure of this utility model more compact.

[0018] 4. This utility model has multiple cooling air outlets on the housing of the refrigeration device, and the air inlet on the lower side of the air guide seat is sealed and inserted into the corresponding cooling air outlet on the corresponding side of the refrigeration device. This can further ensure that all the cold air generated by the refrigeration device can enter the air guide seat, and at the same time, it can also meet the structural requirements of the iron core of the adapter body having multiple core columns.

[0019] 5. This utility model is equipped with cooling devices on both sides of the base, which can ensure that there is sufficient cold air flow for cooling on both sides of the main body, thereby ensuring uniform cooling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dry-type transformer structure using this utility model. Figure 2 for Figure 1 Another structural diagram of a medium-dry type transformer. Figure 3 for Figure 1 Assembly diagram of the iron core and air guide seat. Figure 4 for Figure 3 Another angle of the assembly diagram of the iron core and the air guide seat. Figure 5 for Figure 3 Structural diagram of the central air guide base, cooling unit, and bottom frame. Figure 6 for Figure 5 Schematic diagram of the structure of the middle air guide seat. Figure 7 for Figure 6 Another structural diagram of the central air guide seat. Figure 8 for Figure 5 A schematic diagram of the structure of the refrigeration unit. Figure 9 This is a schematic diagram of the cold air flow path during the operation of this utility model.

[0021] Among them, 1 is the cooling device, 101 is the cooling air outlet, 2 is the air guide seat, 201 is the core column insertion hole, 202 is the side wall of the air guide seat, 2021 is the toothed block, 203 is the air inlet, 3 is the iron core, 301 is the core column, 4 is the outer coil, 401 is the outer coil air duct, 5 is the inner coil, 501 is the inner coil air duct, 502 is the temperature sensor, 6 is the coil gap, 7 is the bottom frame, 701 is the limiting beam, 702 is the core column support beam, 703 is the bottom support beam, 704 is the limiting beam pad, 705 is the core column pad, 8 is the coil pad, 9 is the inner gap, and 10 is the iron core clamp. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figures 1-2 As shown, this utility model includes a main body and a base, wherein the base is provided with cooling devices 1 on both sides and an air guide seat 2 in the middle, and as shown... Figures 6-7 As shown, the air guide seat 2 has air inlets 203 on both sides, which are respectively sealed and connected to the corresponding cooling device 1; as Figure 1 and Figure 3 As shown, the main body of the device includes an iron core 3, and the iron core 3 includes multiple core columns 301. The outer side of the core column 301 is fitted with an inner coil 5 (i.e., a secondary coil) and an outer coil 4 (i.e., a primary coil) from the inside to the outside. The air guide seat 2 is provided with a coil pad 8 inside, and the inner coil 5 is supported by the coil pad 8. The outer coil 4 is supported by the air guide seat side wall 202 of the air guide seat 2.

[0024] like Figure 9 As shown, during operation, the air guide seat 2 forms a sealed space. The cold air generated by the cooling device 1 enters the air guide seat 2 through the air inlet 203 and then enters the transformer body. The main upward flow of cold air in the transformer body includes: the inner layer gap 9 between the inner coil 5 and the corresponding core column 301, the inner layer coil air duct 501 on the inner layer coil 5, the coil gap 6 between the inner coil 5 and the outer layer coil 4, and the outer layer coil air duct 401 on the outer layer coil 4. In this embodiment, the cooling device 1 uses an industrial air conditioner, a commercially available product. Because the cold air it generates is relatively low in temperature and has a pressure difference with the outside air, the cold air can flow rapidly and cool quickly under this pressure difference, thereby achieving efficient cooling of the transformer.

[0025] like Figures 4-7 As shown, in this embodiment, the air guide seat 2 includes a supporting base plate, and the upper edge of the supporting base plate is provided with an air guide seat sidewall 202 along the circumferential direction. The supporting base plate has a core post insertion hole 201 in the middle for the core post 301 to pass through. Additionally, each coil pad 8 is provided on the supporting base plate and is evenly distributed along the circumferential direction of the core post insertion hole 201. This utility model utilizes the coil pads 8 to support the inner coil 5 and the air guide seat sidewall 202 to support the outer coil 4, thereby ensuring the coil gap 6 between the inner coil 5 and the outer coil 4 is set. And as... Figures 1-2 The outer wall of the air guide seat sidewall 202 is connected to the outer wall of the outer coil 4 to form the same surface, which can ensure the simple and beautiful appearance of the transformer product. The bottom of the outer coil 4 and the upper end of the air guide seat sidewall 202 can be provided with appropriate sealing elements, such as sealing rings, as needed, to ensure the sealing performance of the air guide seat sidewall 202. In addition, the diameter of the core column 301 matches the diameter of the core column insertion hole 201 to ensure the sealing performance of the support base plate.

[0026] like Figure 8 As shown, in this embodiment, the housing of the refrigeration device 1 is provided with multiple refrigeration air outlets 101, and Figure 7 and Figure 9 As shown, the air inlet 203 on the lower side of the air guide seat 2 is sealed and inserted into the corresponding cooling air outlet 101 on the corresponding side of the cooling device 1. This can further ensure that all the cold air generated by the cooling device 1 can enter the air guide seat 2, and can also adapt to the structural requirements of the iron core 3 having multiple core columns 301.

[0027] like Figure 5 and Figure 6 As shown in this embodiment, a plurality of toothed blocks 2021 are uniformly arranged along the circumference on the inner side of the air guide seat sidewall 202. The toothed blocks 2021 can strengthen the support strength and guide the cold air to flow upward quickly.

[0028] like Figure 4 and Figure 9 As shown, in this embodiment, the base also includes a bottom frame 7, and two limiting beams 701 are symmetrically arranged in the middle of the bottom frame 7. A core column support beam 702 is provided on the lower side of the two limiting beams 701. The cooling device 1 is provided on the outer side of the limiting beams 701. The lower side of the air guide seat 2 is supported by the cooling devices 1 on both sides and the two limiting beams 701. The lower end of the core column 301 passes through the core column insertion hole 201 of the corresponding air guide seat 2 and is placed between the two limiting beams 701 and supported by the core column support beam 702.

[0029] like Figure 4 and Figure 9 As shown, in this embodiment, a bottom support beam 703 is provided on the lower side of the core column support beam 702, and the bottom of the refrigeration device 1 is supported by the bottom support beam 703.

[0030] like Figure 9 As shown, in this embodiment, a limiting beam pad 704 is provided between the lower side of the limiting beam 701 and the core column support beam 702, and a core column pad 705 is provided between the lower end of the core column 301 and the core column support beam 702. Both the limiting beam pad 704 and the core column pad 705 are insulating pads.

[0031] like Figure 2 As shown, in this embodiment, a temperature sensor 502 is installed inside the air duct at the upper end of the inner coil 5 to detect the outlet air temperature in real time. When the temperature does not meet the requirements, the temperature sensor 502 sends a signal to the equipment control system to adjust the outlet air temperature of the lower cooling device 1. The temperature sensor 502 is a commercially available product, and in this embodiment, the temperature sensor 502 works in conjunction with an intelligent temperature controller (also a commercially available product) to achieve the purpose of automatically monitoring and cyclically displaying the operating temperature value of the low-voltage three-phase winding.

[0032] like Figure 1 As shown, the upper end of the main body of the device is provided with an iron core clamp 10 for fixing the iron core 3, which is a well-known technology in the field. In addition, the specific structure of the inner coil 5 (i.e., the secondary coil) and the outer coil 4 (i.e., the primary coil) is also a well-known technology in the field.

[0033] The working principle of this utility model is as follows: like Figure 9 As shown, when this utility model is working, the refrigeration devices 1 on both sides of the base (in this embodiment, an industrial air conditioner) generate cold air, and the cold air first enters the air guide seat 2 through the air inlet 203, and then enters the main body of the device and flows from bottom to top to achieve the purpose of cooling.

[0034] This invention firstly utilizes the air guide seat 2 to achieve the connection and cooperation between the cooling device 1 and the transformer body. Furthermore, there is a pressure difference between the cold air generated by the cooling device 1 and the external air. Under the action of this pressure difference, the cold air can quickly flow through the air guide seat 2 into the transformer body and flow rapidly from bottom to top inside the transformer body, thereby achieving the purpose of efficient cooling of the transformer.

[0035] Secondly, this utility model designs the base based on the structural characteristics of the iron core 3, inner coil 5, and outer coil 4 of the device body, wherein: I. This utility model utilizes the coil pad 8 inside the air guide seat 2 to support the inner coil 5 and the side wall 202 of the air guide seat to support the outer coil 4, which can ensure the setting of the coil gap 6 between the inner coil 5 and the outer coil 4.

[0036] Second, in this utility model, the outer wall of the air guide seat sidewall 202 is connected to the outer wall of the outer coil 4 to form the same surface. This can ensure the simple and beautiful appearance of the transformer product, and at the same time, it can also ensure the sealing of the air guide seat sidewall 202. The diameter of the core column 301 matches the diameter of the core column insertion hole 201, which can ensure the sealing of the support base plate of the air guide seat 2, thereby ensuring that a sealed cavity is formed inside the air guide seat 3 to guide the flow of cold air.

[0037] Third, in order to facilitate the installation of the air guide seat 2 and the cooling device 1, the base of this utility model also includes a bottom frame 7, which ensures that the entire device is firmly supported while making the overall structure of this utility model more compact.

[0038] Fourth, the present invention provides multiple cooling air outlets 101 on the housing of the refrigeration device 1, and the air inlet 203 on the lower side of the air guide seat 2 is sealed and inserted into the corresponding cooling air outlet 101 on the corresponding side of the refrigeration device 1. This can further ensure that all the cold air generated by the refrigeration device 1 can enter the air guide seat 2, and at the same time, it can adapt to the structural requirements of the iron core 3 having multiple core columns 301.

Claims

1. A cooling structure for a dry-type transformer, characterized in that: The device includes a main body and a base. The base has cooling devices (1) on both sides and an air guide seat (2) in the middle. The air guide seat (2) has air inlets (203) on both sides that are sealed and connected to the cooling devices (1) on the corresponding sides. The main body includes an iron core (3) and the iron core (3) includes a core column (301). The core column (301) is fitted with an inner coil (5) and an outer coil (4) in sequence. The air guide seat (2) has a coil pad (8) inside. The inner coil (5) is supported by the coil pad (8), and the outer coil (4) is supported by the air guide seat sidewall (202) of the air guide seat (2). The lower end of the air guide seat (2) has a core column insertion hole (201) through which the core column (301) passes.

2. The dry-type transformer cooling structure according to claim 1, characterized in that: The air guide seat (2) includes a support base plate, and the upper edge of the support base plate is provided with the air guide seat sidewall (202) along the circumferential direction. The support base plate is provided with the core column insertion hole (201) in the middle. In addition, each coil pad (8) is provided on the support base plate.

3. The dry-type transformer cooling structure according to claim 1 or 2, characterized in that: Each coil pad (8) is arranged circumferentially along the core insertion hole (201).

4. The dry-type transformer cooling structure according to claim 1 or 2, characterized in that: The inner side of the air guide seat sidewall (202) is provided with a plurality of toothed blocks (2021) along the circumferential direction.

5. The dry-type transformer cooling structure according to claim 1, characterized in that: The housing of the refrigeration device (1) is provided with multiple refrigeration air outlets (101), and the air inlet (203) on the lower side of the air guide seat (2) is sealed and inserted into the corresponding refrigeration air outlet (101) on the corresponding side of the refrigeration device (1).

6. The dry-type transformer cooling structure according to claim 1, characterized in that: The base includes a bottom frame (7), and two limiting beams (701) are provided in the middle of the bottom frame (7). A core column support beam (702) is provided on the lower side of the two limiting beams (701). The cooling device (1) is provided on the outer side of the limiting beam (701). The lower side of the air guide seat (2) is supported by the cooling devices (1) on both sides and the two limiting beams (701). The lower end of the core column (301) passes through the core column insertion hole (201) of the corresponding air guide seat (2) and is placed between the two limiting beams (701) and supported by the core column support beam (702).

7. The dry-type transformer cooling structure according to claim 6, characterized in that: The core support beam (702) has a bottom support beam (703) on its lower side, and the bottom of the refrigeration device (1) is supported by the bottom support beam (703).

8. The dry-type transformer cooling structure according to claim 6, characterized in that: A limiting beam pad (704) is provided between the lower side of the limiting beam (701) and the core column support beam (702), and a core column pad (705) is provided between the lower end of the core column (301) and the core column support beam (702).

9. The dry-type transformer cooling structure according to claim 1, characterized in that: A temperature sensor (502) is provided at the upper end of the inner coil (5).

Images