Dry-type transformer with cooling structure

Abstract

The utility model relates to dry -type transformer technical field, concretely relates to a dry -type transformer with cooling structure, including the cabinet, the both sides of cabinet are all seted up and have honeycomb corrugated air passage of fixed clamping to inside heat dissipation window, the utility model discloses through the " air conditioning system " of the heat dissipation window, honeycomb corrugated air passage, air current circulation channel, vent, air supply channel and finned heat exchanger composition of additional installation, in addition to only for the heat dissipation window of transformer body cooling ventilation, additional again the secondary circulation air duct of heat dissipation window, air current circulation channel, vent and air supply channel composition is seted up, is separated through finned heat exchanger in the middle, when working, the hot air in the inside is blown to the transformer after flowing through finned heat exchanger, and the heat is conducted, is cooled, and the air after cooling is blown to the transformer again through air supply channel by heat dissipation fan, and completes an internal circulation.

Description

Technical Field

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

[0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery equipment, and other places. Simply put, dry-type transformer is short for dry-type power transformer, which refers to a dry-type transformer whose core and windings are not impregnated with oil or other liquids. Its core is made of stacked silicon steel sheets, and the magnetic circuit system adopts the principle of electromagnetic saturation, using the air gap magnetic field to transfer energy. The cooling methods are divided into natural air cooling and forced air cooling. When naturally air-cooled, the transformer can operate continuously for a long time at its rated capacity. When forced air-cooled, the transformer output capacity can be increased by 50%, which is suitable for intermittent overload operation or emergency overload operation. Because the load loss and impedance voltage increase significantly during overload, it is in an uneconomical operating state, so it should not be operated under continuous overload for a long time.

[0003] A search revealed a utility model patent with publication number CN221596122U, which discloses a dry-type transformer with a cooling structure. The transformer includes a cabinet with a door fixedly installed on its exterior. A temperature display screen is fixedly installed on one side of the door. Ventilation openings are provided on the exterior of the cabinet, and heat dissipation windows are provided on both sides. This utility model's design, including the cabinet, ventilation openings, heat dissipation windows, resistance shaft, fan blades, top cover, large cooling fan, fixed base, and side cooling fans, allows the side cooling fans on both sides of the fixed base to be opened when using the dry-type transformer, enabling rapid cooling of the high-voltage windings. Simultaneously, the angle of the fan blades at the heat dissipation windows can be adjusted via the resistance shaft according to the current overload temperature of the dry-type transformer. Combined with the large cooling fan on the top cover, this ensures continuous cooling of both the high-voltage and low-voltage windings inside the cabinet.

[0004] The aforementioned patent only uses a cabinet, ventilation openings, heat dissipation windows, resistance shaft, fan blades, top cover, large cooling fan, fixed base, and side cooling fans. When using this dry-type transformer, the side cooling fans on both sides of the fixed base can be opened to allow the side cooling fans to quickly cool the high-voltage windings. At the same time, the angle of the fan blades at the heat dissipation window can be adjusted by the resistance shaft according to the current overload temperature of the dry-type transformer. Combined with the large cooling fan on the top cover, the high-voltage windings and low-voltage windings inside the cabinet can achieve continuous cooling. However, it cannot fully isolate the harsh external environment. The simple ventilation opening setting cannot effectively prevent dust, salt spray, and humid air from entering the transformer body, and cannot guarantee heat dissipation efficiency.

[0005] Therefore, it is necessary to invent a dry-type transformer with a cooling structure to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a dry-type transformer with a cooling structure. By adding an "air conditioning system" consisting of a heat dissipation window, honeycomb-shaped wave-shaped air duct, airflow circulation channel, vent, air supply channel, and finned heat exchanger, a secondary circulation air duct is added in addition to the heat dissipation window that provides cooling and ventilation for the transformer body. This secondary circulation air duct is separated from the transformer body by the finned heat exchanger. During operation, the internal hot air flows through the finned heat exchanger, where its heat is conducted away and it is cooled. The cooled air is then blown back to the transformer by the cooling fan through the air supply channel, completing an internal circulation. This keeps the transformer body in a clean, dry microenvironment, preventing the mixing of internal and external air, perfectly isolating it from harsh external environments, and preventing dust, salt spray, and humid air from entering the transformer body. This ensures efficient heat dissipation and is particularly suitable for offshore platforms, chemical plants, and paper mills. It addresses the problems of existing technologies that cannot adequately isolate the transformer from harsh external environments, and the inability of simple vent designs to effectively prevent dust, salt spray, and humid air from entering the transformer body, thus failing to guarantee efficient heat dissipation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a dry-type transformer with a cooling structure, comprising a cabinet, on both sides of the cabinet having heat dissipation windows, and honeycomb-shaped wave air channels fixedly connected to the interior of the heat dissipation windows; airflow circulation channels located on the sides of the honeycomb-shaped wave air channels are fixedly connected to both sides of the exterior of the cabinet; ventilation openings are equidistantly provided on the front and rear sides of the cabinet; air supply channels are fixedly connected between the front and rear sides of the airflow circulation channels and the ventilation openings; and finned heat exchangers are equidistantly fitted between the honeycomb-shaped wave air channels and the airflow circulation channels.

[0008] Preferably, high-voltage windings are installed at equal intervals on the bottom wall of the cabinet, low-voltage windings are fixedly installed inside the high-voltage windings, an iron core is installed on the top of the low-voltage windings, and a temperature sensor is installed above the iron core.

[0009] Preferably, an optical fiber temperature measuring point is installed on the front side of the low-voltage winding, and a temperature probe is installed on the side of the low-voltage winding.

[0010] Preferably, the high-voltage winding is provided with a flow guide hole, and the number of the flow guide holes is set to multiple, and the multiple flow guide holes are distributed in a ring array about the center point of the high-voltage winding.

[0011] Preferably, mounting brackets are fixedly installed on the front and rear sides of the inner wall of the cabinet, and a cooling fan located outside the air guide hole is installed on the inner side of each of the two mounting brackets.

[0012] Preferably, the top of the cabinet is detachably connected to a top plate, and a second cooling fan located on top of the high-voltage winding is installed at equal intervals at the bottom of the top plate.

[0013] Preferably, a temperature display screen is installed on the front side of the cabinet exterior.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows: By adding an "air conditioning system" consisting of heat dissipation windows, honeycomb wave air ducts, airflow circulation channels, vents, air supply channels, and finned heat exchangers, in addition to the heat dissipation windows that only provide cooling and ventilation for the transformer body, an additional secondary circulation air duct consisting of heat dissipation windows, airflow circulation channels, vents, and air supply channels is installed. The two are separated by finned heat exchangers. During operation, the internal hot air flows through the finned heat exchangers, where the heat is conducted away and the air itself is cooled. The cooled air then passes through the air supply channel and is blown back to the transformer by the cooling fan, completing an internal circulation. This keeps the transformer body in a clean and dry microenvironment, preventing the mixing of internal and external air, perfectly isolating it from harsh external environments, and preventing dust, salt spray, and humid air from entering the transformer body. At the same time, it ensures heat dissipation efficiency and is particularly suitable for offshore platforms, chemical, and paper industries. The temperature is monitored in real time by pre-embedded fiber optic temperature measuring points on the low-voltage winding. When the temperature in a certain area exceeds the standard, the corresponding cooling fan 1 and cooling fan 2 can be started or accelerated in conjunction with the temperature sensor and temperature probe to achieve "precise cooling". This is more energy-efficient than the traditional "all on" mode and can extend the life of cooling fan 1 and cooling fan 2. In addition, by precisely designing multiple air guide holes on the high-voltage winding, the cooling air is guided more accurately to the hottest part, avoiding "airflow short circuit" or cooling dead zone. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the top plate and the cooling fan of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the cabinet body and the honeycomb-shaped wave air duct connection of this utility model; Figure 4 This is a side view of the high-voltage winding and cooling fan of this utility model. Figure 5 This is a schematic diagram of the cross-sectional structure connecting the cabinet body with the honeycomb-shaped wave air duct and airflow circulation channel of this utility model. Figure 6 This is a front view schematic diagram of the connection between the cabinet and the airflow circulation channel of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Cabinet; 2. Heat dissipation window; 3. Honeycomb wave air duct; 4. Air circulation channel; 5. Ventilation opening; 6. Air supply channel; 7. High voltage winding; 8. Low voltage winding; 9. Iron core; 10. Temperature sensor; 11. Fiber optic temperature measurement point; 12. Temperature probe; 13. Air guide hole; 14. Mounting bracket; 15. Cooling fan one; 16. Top plate; 17. Cooling fan two; 18. Temperature display screen; 19. Finned heat exchanger. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model provides, for example Figure 1-6 The dry-type transformer with cooling structure shown includes a cabinet 1. Both sides of the cabinet 1 are provided with heat dissipation windows 2. The heat dissipation windows 2 are fixedly connected to honeycomb wave air channels 3. The honeycomb wave air channels 3 replace the simple vertical air channels, increase the heat dissipation area and air turbulence, break the air boundary layer, and improve the heat exchange efficiency. Both sides of the cabinet body 1 are fixedly connected to airflow circulation channels 4 located on the sides of honeycomb-shaped wave air ducts 3. Ventilation openings 5 ​​are equidistantly provided on the front and rear sides of the cabinet body 1. Air supply channels 6 are fixedly connected between the front and rear sides of the airflow circulation channels 4 and the ventilation openings 5. Finned heat exchangers 19 are equidistantly clamped between the honeycomb-shaped wave air ducts 3 and the airflow circulation channels 4. An "air conditioning system" consisting of heat dissipation windows 2, honeycomb-shaped wave air ducts 3, airflow circulation channels 4, ventilation openings 5, air supply channels 6, and finned heat exchangers 19 is installed. Except for the heat dissipation windows 2 which are only used for cooling and ventilation of the transformer body, An additional secondary circulation air duct is installed, consisting of a heat dissipation window 2, an airflow circulation channel 4, a vent 5, and an air supply channel 6. The duct is separated by a finned heat exchanger 19. During operation, the internal hot air flows through the finned heat exchanger 19, where the heat is conducted away and the air is cooled. The cooled air then passes through the air supply channel 6 and is blown back to the transformer by the cooling fan 15, completing an internal circulation. This keeps the transformer body in a clean and dry microenvironment, preventing the internal and external air from mixing and perfectly isolating it from harsh external environments, thus preventing dust, salt spray, and humid air from entering the transformer body.

[0020] High-voltage windings 7 are installed at equal intervals on the bottom wall inside the cabinet 1. Low-voltage windings 8 are fixedly installed inside the high-voltage windings 7. Iron cores 9 are installed on the top of the low-voltage windings 8. Temperature sensors 10 are installed above the iron cores 9. The preferred model of temperature sensor 10 is PT100. All built-in electrical components are connected to the PLC controller.

[0021] A fiber optic temperature measuring point 11 is installed on the front side of the low-voltage winding 8. The temperature is monitored in real time through the fiber optic temperature measuring point 11 embedded in the low-voltage winding 8. When the temperature in a certain area exceeds the standard, it can work with the temperature sensor 10 and the temperature probe 12 to start or accelerate only the corresponding area's cooling fan 15 and cooling fan 2 17 to achieve "precise cooling". This is more energy-efficient than the traditional "all on" mode. All built-in electrical components are connected to the PLC controller. A temperature probe 12, preferably ATE200, is installed on the side of the low-voltage winding 8. The temperature probe 12, located between the high-voltage winding 7 and the low-voltage winding 8, will detect the temperature of the dry-type transformer in real time. When the temperature reaches the warning line and a high-temperature overload occurs, the temperature sensor 10, which is wired to the temperature probe 12, will transmit the current overload temperature to the temperature display screen 18. This allows external operators to promptly activate the cooling structure to cool the dry-type transformer. All built-in electrical components are connected to the PLC controller.

[0022] The high-voltage winding 7 is provided with multiple guide holes 13. The multiple guide holes 13 are arranged in a ring array about the center point of the high-voltage winding 7. By precisely designing multiple guide holes 13 on the high-voltage winding 7 and aligning the guide holes 13 with the cooling fan 15, the cooling air is guided to the hottest part more accurately, avoiding "airflow short circuit" or cooling dead zone.

[0023] Mounting brackets 14 are fixedly installed on the front and rear sides of the inner wall of the cabinet 1. Cooling fans 15 located outside the air guide holes 13 are installed on the inner side of the two mounting brackets 14. The built-in electrical components are all connected to the PLC controller.

[0024] The top of the cabinet 1 is detachably connected to a top plate 16. At the bottom of the top plate 16, a cooling fan 17 located on top of the high voltage winding 7 is installed at equal intervals. All built-in electrical components are connected to the PLC controller.

[0025] A temperature display screen 18 is installed on the front side of the cabinet 1, and all the built-in electrical components are connected to the PLC controller.

[0026] The working principle of this practical application is as follows: First, connect the external power supply, and then install the dry-type transformer assembly in the cabinet 1 using fixing screws. When the dry-type transformer is in normal use, the temperature probe 12 and the fiber optic temperature measuring point 11 located between the high-voltage winding 7 and the low-voltage winding 8 will detect the temperature of the dry-type transformer in real time. When the temperature reaches the warning line and a high-temperature overload occurs, the temperature sensor 10 connected to the temperature probe 12 will transmit the current overload temperature to the temperature display screen 18 and the fiber optic temperature measuring point 11 to monitor the temperature in real time. When the temperature in a certain area exceeds the standard, the temperature sensor 10 and the temperature probe 12 can work together to start or accelerate only the corresponding area's cooling fan 15 and cooling fan 2 17 to achieve "precise cooling". During operation, the internal hot air flows through the finned heat exchanger 19 and the heat is conducted away, and the air itself is cooled. The cooled air is blown back to the transformer by the cooling fan 15 through the air supply channel 6, completing an internal circulation.

[0027] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dry-type transformer with a cooling structure, comprising a cabinet (1), characterized in that: The cabinet (1) has heat dissipation windows (2) on both sides. The heat dissipation windows (2) are fixedly connected to the inside of the heat dissipation windows (2). The cabinet (1) has airflow circulation channels (4) fixedly connected to the sides of the honeycomb wave air channels (3). The cabinet (1) has ventilation openings (5) at equal intervals on the front and back sides. The air supply channels (6) are fixedly connected to the front and back sides of the airflow circulation channels (4) and the ventilation openings (5). The honeycomb wave air channels (3) and the airflow circulation channels (4) are fixedly connected to finned heat exchangers (19) at equal intervals.

2. A dry-type transformer with a cooling structure according to claim 1, characterized in that: High voltage windings (7) are installed at equal intervals on the bottom wall inside the cabinet (1). Low voltage windings (8) are fixedly installed inside the high voltage windings (7). An iron core (9) is installed on the top of the low voltage windings (8). A temperature sensor (10) is installed above the iron core (9).

3. A dry-type transformer with a cooling structure according to claim 2, characterized in that: A fiber optic temperature measuring point (11) is installed on the front side of the low-voltage winding (8), and a temperature probe (12) is installed on the side of the low-voltage winding (8).

4. A dry-type transformer with a cooling structure according to claim 2, characterized in that: The high-voltage winding (7) is provided with a flow guide hole (13), and the number of the flow guide holes (13) is set to multiple, and the multiple flow guide holes (13) are arranged in a ring array about the center point of the high-voltage winding (7).

5. A dry-type transformer with a cooling structure according to claim 1, characterized in that: The cabinet (1) has mounting brackets (14) fixedly installed on the front and rear sides of its inner wall, and a cooling fan (15) located outside the air guide hole (13) is installed on the inner side of each of the two mounting brackets (14).

6. A dry-type transformer with a cooling structure according to claim 1, characterized in that: The top of the cabinet (1) is detachably connected to a top plate (16), and a second cooling fan (17) located on the top of the high voltage winding (7) is installed at equal intervals at the bottom of the top plate (16).

7. A dry-type transformer with a cooling structure according to claim 1, characterized in that: A temperature display screen (18) is installed on the front side of the cabinet (1).

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