Low-loss energy-saving dry-type transformer

Abstract

The utility model discloses a low loss energy -saving dry -type transformer, it includes iron core, winding subassembly, heat abstractor and shell, iron core is three -phase lamination formula structure, is fixed in the central part of shell interior, winding subassembly is constituted by high -voltage winding and low -voltage winding, and both are separated through insulating partition, and insulating partition is embedded with nanometer carbon fiber heat conduction strip, heat abstractor includes heat dissipation substrate, heat pipe and heat dissipation fin group, and heat dissipation fin group is by wavy metal sheet stacking and is connected through elastic support piece, shell top is equipped with air flow adjusting mechanism, including air intake, flow guide cover and adjustable damper, the utility model discloses through optimizing heat conduction path and dynamic air flow regulation, remarkablely improves the heat dissipation efficiency, reduces energy consumption, solves the problem of traditional dry -type transformer local temperature rise too high, and the comprehensive energy consumption reduces 20% or above.

Description

Technical Field

[0001] This utility model relates to the technical field of power equipment, and in particular to a low-loss, energy-saving dry-type transformer. Background Technology

[0002] With the development of the power equipment industry, dry-type transformers have been widely used in various power distribution systems. However, these products still have some problems in actual use. For example, dry-type transformers on the market generally suffer from high energy consumption, insufficient heat dissipation, and low operating efficiency, which makes them prone to overheating under high load conditions, affecting the stability and service life of the equipment. In addition, some existing dry-type transformers have not fully considered energy-saving factors in their structural design, resulting in energy waste and failing to meet the demands of modern industry for efficient and environmentally friendly equipment.

[0003] A search revealed a dry-type transformer with patent number CN103765534B, published on March 29, 2017. This design optimizes the turns ratio by setting winding regions of varying widths, thereby improving transformer efficiency. While this structure can improve electromagnetic coupling to some extent, the lack of optimization of the overall heat dissipation structure may still lead to excessive localized temperature rise during long-term operation, affecting the transformer's stability and safety. Furthermore, this solution lacks research on the application of energy-saving materials, failing to effectively reduce no-load and load losses, thus limiting its application in low-energy consumption scenarios.

[0004] The aforementioned problems indicate that current dry-type transformers on the market still have significant shortcomings in terms of energy-saving performance, heat dissipation capacity, and operating efficiency, making it difficult to meet the growing demand of the current power system for energy-saving and environmentally friendly equipment. Therefore, this utility model provides a low-loss, energy-saving dry-type transformer to overcome these deficiencies and provide a new solution that is more efficient, environmentally friendly, and adaptable to various operating environments. Utility Model Content

[0005] The purpose of this invention is to provide a low-loss, energy-saving dry-type transformer to overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A low-loss, energy-saving dry-type transformer includes a core, winding assembly, heat dissipation device, and outer casing. The core is a three-phase laminated structure and is fixed in the center of the outer casing. The winding assembly consists of a high-voltage winding and a low-voltage winding, which are respectively sleeved on the outer periphery of the core and arranged concentrically. The high-voltage winding and the low-voltage winding are separated by an insulating partition. The surface of the insulating partition has uniformly arranged heat-conducting grooves, and nano-carbon fiber heat-conducting strips are embedded in the heat-conducting grooves. The heat dissipation device includes a heat dissipation base plate, heat-conducting pipes, and heat dissipation fins. The heat dissipation base plate is fixed around the inner wall of the outer casing, and the inner surface of the heat dissipation base plate has several current-conducting... The heat pipe is welded to one end of the heat pipe, and the other end of the heat pipe extends to the outside of the outer shell and is welded to the heat dissipation fin assembly. The heat dissipation fin assembly is composed of multiple layers of corrugated metal sheets stacked together. Adjacent corrugated metal sheets are connected by elastic support members. The two ends of the elastic support members are welded and fixed to the crests and troughs of the corrugated metal sheets, respectively. The top of the outer shell is provided with an airflow regulating mechanism, which includes an air inlet, a flow guide, and an adjustable damper. The air inlet is located at the center of the top surface of the outer shell. The flow guide is fixed below the air inlet and communicates with the inside of the outer shell. The adjustable damper is installed inside the flow guide and is connected to the drive motor through a rotating shaft.

[0007] A further preferred embodiment: the thermally conductive grooves on the surface of the insulating partition are uniformly distributed radially along the insulating partition, and the depth of the thermally conductive grooves is consistent with the length of the nano-carbon fiber thermally conductive strip. The cross-section of the nano-carbon fiber thermally conductive strip is trapezoidal, and its width gradually increases from the surface of the insulating partition towards the iron core. The thickness of the nano-carbon fiber thermally conductive strip is 0.5 mm, and its length is equal to the depth of the thermally conductive groove. The outer surface of the nano-carbon fiber thermally conductive strip is coated with a layer of graphene coating.

[0008] A further preferred embodiment: The heat pipe is filled with a liquid metal heat-conducting medium, and its outer wall has a spiral groove. A ceramic fiber insulation layer is embedded inside the spiral groove. The diameter of the heat pipe is 12mm, and its length is the same as the height of the heat dissipation substrate. The flow channels on the inner surface of the heat dissipation substrate are evenly distributed along the height direction of the heat dissipation substrate, and the width of the flow channels is the same as the diameter of the heat pipe.

[0009] A further preferred embodiment: the wavy metal sheets in the heat dissipation fin assembly are kept at a fixed spacing by an elastic support. The elastic support is made of nickel-titanium alloy wire with a diameter of 1.5 mm. The two ends of the elastic support are welded to the crests and troughs of the wavy metal sheets, respectively. The wavy metal sheets have a wavelength of 30 mm and a wave height of 8 mm. The spacing between two adjacent layers of wavy metal sheets is 2 mm to 5 mm.

[0010] A further preferred embodiment: The adjustable damper consists of multiple arc-shaped blades, each with micro-diffuses on its surface. The arc-shaped blades are connected to a drive motor via a rotating shaft. The drive motor is fixed to the top of the shroud. An annular guide rail is provided on the inner wall of the shroud, and this guide rail is slidably connected to the edge of the arc-shaped blades. The central axis of the air inlet coincides with the central axis of the shroud. The annular guide rail is also slidably connected to the edge of the arc-shaped blades on the inner wall of the shroud. The output shaft of the drive motor is fixedly connected to the rotating shaft, which passes through the center of each arc-shaped blade and is also fixedly connected to it.

[0011] The structure and implementation principle of this utility model are as follows: the heat generated by the winding assembly during operation is quickly conducted to the heat dissipation substrate through the nano-carbon fiber heat-conducting strip on the insulating partition. The trapezoidal cross-section design of the nano-carbon fiber heat-conducting strip gradually increases the heat diffusion path from the narrow end to the wide end, thereby improving the heat conduction efficiency. The graphene coating further enhances the heat conduction performance. The flow channel in the heat dissipation substrate guides the heat to the heat pipe. The liquid metal heat-conducting medium in the heat pipe absorbs the heat, heats up rapidly, and evaporates. The vapor flows along the heat pipe to the heat dissipation fin assembly and releases the heat. The cooled liquid metal flows back to the bottom of the heat pipe to form a circulation. The corrugated metal sheets in the heat dissipation fin assembly are kept at an appropriate distance by the elastic support. When the external airflow passes through, the corrugated metal sheets vibrate slightly due to the action of the elastic support, thereby destroying the boundary layer effect and enhancing the heat exchange effect. The airflow regulating mechanism adjusts the opening and closing angle of the adjustable damper according to the working state of the transformer. The drive motor drives the arc-shaped blades to rotate through the rotating shaft. The micro-turbulence holes on the surface of the arc-shaped blades form a vortex effect when the airflow passes through, further improving the heat exchange efficiency between the air and the heat dissipation fin assembly.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The combination of nano-carbon fiber heat-conducting strips and graphene coating significantly improves the heat transfer efficiency between the winding assembly and the heat dissipation substrate, solving the problem of excessive local temperature rise in traditional dry-type transformers. Simultaneously, the trapezoidal cross-section design optimizes the heat diffusion path, resulting in more uniform heat transfer. 2. The combination design of the corrugated metal sheets and elastic supports in the heat dissipation fin assembly generates micro-vibrations under airflow, effectively disrupting the boundary layer effect and significantly enhancing heat dissipation performance. Compared to traditional static heat dissipation structures, heat exchange efficiency is improved by more than 30%. 3. The airflow regulation mechanism, through the dynamic opening and closing of adjustable dampers and the micro-turbulence holes on the surface of the arc-shaped blades, achieves precise airflow control under different operating conditions. This avoids energy loss due to excessive heat dissipation while ensuring heat dissipation requirements under high load conditions, resulting in a comprehensive energy consumption reduction of more than 20%. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partially enlarged schematic diagram of the winding assembly and insulating partition of this utility model; Figure 3 This is a schematic diagram of the heat dissipation device structure of this utility model; Figure 4 This is a partial cross-sectional view of the heat dissipation fin assembly and elastic support of this utility model; Figure 5 This is a schematic diagram of the internal structure of the airflow regulating mechanism of this utility model.

[0014] The attached figures are labeled as follows: 1. Iron core; 2. High-voltage winding; 3. Low-voltage winding; 4. Insulating partition; 5. Thermally conductive groove; 6. Nano-carbon fiber thermally conductive strip; 7. Graphene coating; 8. Heat dissipation substrate; 9. Airflow channel; 10. Heat pipe; 11. Liquid metal thermally conductive medium; 12. Spiral groove; 13. Ceramic fiber thermal insulation layer; 14. Heat dissipation fin assembly; 15. Corrugated metal sheet; 16. Elastic support; 17. Air inlet; 18. Airflow shroud; 19. Adjustable damper; 20. Arc-shaped blade; 21. Miniature turbulence hole; 22. Rotating shaft; 23. Drive motor; 24. Annular guide rail; 25. Outer shell. Detailed Implementation

[0015] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0016] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings: Please see Figure 1 This utility model provides a low-loss, energy-saving dry-type transformer, including a core 1, winding assembly, heat dissipation device, and outer casing 25. The core 1 is a three-phase laminated structure and is fixed in the center of the outer casing 25. The winding assembly consists of a high-voltage winding 2 and a low-voltage winding 3, which are respectively sleeved on the outer periphery of the core 1 and arranged concentrically. The high-voltage winding 2 and the low-voltage winding 3 are separated by an insulating partition 4. The surface of the insulating partition 4 is provided with uniformly arranged heat-conducting grooves 5, and nano-carbon fiber heat-conducting strips 6 are embedded inside the heat-conducting grooves 5. The heat dissipation device includes a heat dissipation base plate 8, a heat-conducting pipe 10, and a heat dissipation fin assembly 14. The heat dissipation base plate 8 is fixed around the inner wall of the outer casing 25. The inner surface of the heat dissipation base plate 8 is provided with several flow channels 9. The flow channels 9 are welded to one end of the heat-conducting pipe 10, and the other end of the heat-conducting pipe 10 extends to the outside of the outer casing 25 and is welded to the heat dissipation fin assembly 14. The heat dissipation fin assembly 14 is composed of multiple layers of corrugated metal sheets 15 stacked together. Adjacent layers of corrugated metal sheets 15 are connected by elastic support members 16. The two ends of the elastic support members 16 are welded and fixed to the crests and troughs of the corrugated metal sheets 15, respectively. The top of the outer casing 25 is provided with an airflow regulating mechanism, which includes an air inlet 17, a guide shroud 18, and an adjustable damper 19. The air inlet 17 is located at the center of the top surface of the outer casing 25. The guide shroud 18 is fixed below the air inlet 17 and communicates with the interior of the outer casing 25. The adjustable damper 19 is installed inside the guide shroud 18 and is connected to the drive motor 23 via a rotating shaft 22.

[0019] Please see Figure 2 The insulating partition 4 has a heat-conducting groove 5 containing a nano-carbon fiber heat-conducting strip 6. The nano-carbon fiber heat-conducting strip 6 has a trapezoidal cross-section, with its width gradually increasing from the surface of the insulating partition 4 towards the iron core 1. It has a thickness of 0.5 mm and a length equal to the depth of the heat-conducting groove 5. The outer surface of the nano-carbon fiber heat-conducting strip 6 is coated with a graphene coating 7. The trapezoidal cross-section design increases the heat diffusion path from the narrow end to the wide end, thereby improving thermal conductivity. The graphene coating 7 further enhances the thermal conductivity. The trapezoidal design of the nano-carbon fiber heat-conducting strip 6 optimizes the heat diffusion path, making heat transfer more uniform and significantly improving the thermal conductivity between the winding assembly and the heat dissipation substrate 8.

[0020] Please see Figure 3 The inner surface of the heat dissipation substrate 8 is provided with several flow channels 9. The flow channels 9 are welded to one end of the heat pipe 10, and the other end of the heat pipe 10 extends to the outside of the outer casing 25 and is welded to the heat dissipation fin assembly 14. The heat pipe 10 is filled with liquid metal thermal conductive medium 11, and the outer wall of the heat pipe 10 is provided with a spiral groove 12. A ceramic fiber heat insulation layer 13 is embedded in the spiral groove 12. The diameter of the heat pipe 10 is 12mm, and its length is the same as the height of the heat dissipation substrate 8. After absorbing heat, the liquid metal thermal conductive medium 11 rapidly heats up and evaporates. The vapor flows along the heat pipe 10 to the heat dissipation fin assembly 14 and releases heat. The cooled liquid metal flows back to the bottom of the heat pipe 10 to form a circulation. The ceramic fiber heat insulation layer 13 effectively reduces heat loss to the outer casing 25 and ensures efficient heat transfer to the heat dissipation fin assembly 14.

[0021] Please see Figure 4 The heat dissipation fin assembly 14 is composed of multiple layers of corrugated metal sheets 15 stacked together. Adjacent layers of corrugated metal sheets 15 are connected by elastic supports 16, with both ends of the elastic supports 16 welded to the crests and troughs of the corrugated metal sheets 15, respectively. The wavelength of the corrugated metal sheets 15 is 30 mm, the wave height is 8 mm, and the spacing between adjacent layers of corrugated metal sheets 15 is 2 mm to 5 mm. The elastic supports 16 are made of nickel-titanium alloy wire with a diameter of 1.5 mm, capable of generating slight vibrations under airflow, thereby disrupting the boundary layer effect and enhancing heat transfer. Compared to traditional static heat dissipation structures, this design improves heat transfer efficiency by more than 30%.

[0022] Please see Figure 5 The airflow regulating mechanism includes an air inlet 17, a flow deflector 18, and an adjustable damper 19. The adjustable damper 19 consists of multiple arc-shaped blades 20, each with micro-turbulence holes 21 on its surface. The arc-shaped blades 20 are connected to a drive motor 23 via a rotating shaft 22. The drive motor 23 is fixed to the top of the flow deflector 18, and the inner wall of the flow deflector 18 has an annular guide rail 24 that slides along the edge of the arc-shaped blades 20. The drive motor 23 rotates the arc-shaped blades 20 via the rotating shaft 22. The micro-turbulence holes 21 on the surface of the arc-shaped blades 20 create a vortex effect when airflow passes through, further improving the heat exchange efficiency between the air and the heat dissipation fin assembly 14. The airflow regulating mechanism adjusts the opening angle of the adjustable damper 19 according to the transformer's operating state, avoiding energy loss due to excessive heat dissipation while ensuring heat dissipation requirements under high load conditions.

[0023] The working principle is as follows: When the transformer is running, the heat generated by the winding assembly is rapidly conducted to the heat dissipation substrate 8 through the nano-carbon fiber heat-conducting strips 6 on the insulating partition 4. The trapezoidal cross-section design of the nano-carbon fiber heat-conducting strips 6 and the graphene coating 7 significantly improve the heat transfer efficiency. The flow channels 9 in the heat dissipation substrate 8 guide the heat to the heat pipes 10. The liquid metal heat-conducting medium 11 in the heat pipes 10 absorbs the heat, heats up rapidly, and evaporates. The vapor flows along the heat pipes 10 to the heat dissipation fin assembly 14 and releases the heat. The cooled liquid metal flows back to the bottom of the heat pipes 10 to form a circulation. The corrugated metal sheets 15 in the heat dissipation fin assembly 14 are maintained at an appropriate spacing by the elastic support 16. When external airflow passes through, the corrugated metal sheets 15 vibrate slightly due to the action of the elastic support 16, thereby disrupting the boundary layer effect and enhancing the heat transfer effect. The airflow regulating mechanism adjusts the opening and closing angle of the adjustable damper 19 according to the working state of the transformer. The drive motor 23 drives the arc blade 20 to rotate through the rotating shaft 22. The micro-turbulence holes 21 on the surface of the arc blade 20 form a vortex effect when the airflow passes through, which further improves the heat exchange efficiency between the air and the heat dissipation fin assembly 14.

[0024] Traditional dry-type transformers are prone to localized overheating, leading to a shortened equipment lifespan. By adopting the low-loss, energy-saving dry-type transformer of this invention, the heat generated by the winding components is efficiently transferred to the external environment through nano-carbon fiber heat-conducting strips 6 and a heat dissipation device. The airflow regulation mechanism dynamically adjusts the heat dissipation intensity according to the actual load, ensuring the transformer is always in optimal operating condition. Actual testing shows that the transformer's overall energy consumption is reduced by more than 20%, while the uniformity of temperature rise is significantly improved, and its service life is extended by more than 30%.

[0025] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low-loss, energy-saving dry-type transformer, characterized in that: The device includes an iron core (1), a winding assembly, a heat dissipation device, and an outer shell (25). The iron core (1) is a three-phase laminated structure and is fixed in the center of the outer shell (25). The winding assembly consists of a high-voltage winding (2) and a low-voltage winding (3). The high-voltage winding (2) and the low-voltage winding (3) are respectively sleeved on the outer periphery of the iron core (1) and are distributed in concentric circles. The high-voltage winding (2) and the low-voltage winding (3) are separated by an insulating partition (4). The surface of the insulating partition (4) is provided with uniformly arranged heat-conducting grooves (5). The heat-conducting grooves (5) are embedded with nano-carbon fiber heat-conducting strips (6). The heat dissipation device includes a heat dissipation substrate (8), a heat-conducting pipe (10), and a heat dissipation fin assembly (14). The heat dissipation substrate (8) is fixed around the inner wall of the outer shell (25). The inner surface of the heat dissipation substrate (8) is provided with several flow channels (9). The flow channels (9) are welded to one end of the heat-conducting pipe (10). The heat pipe (10) is connected to the outside of the outer shell (25) and welded to the heat dissipation fin assembly (14). The heat dissipation fin assembly (14) is composed of multiple layers of corrugated metal sheets (15). The adjacent corrugated metal sheets (15) are connected by an elastic support (16). The two ends of the elastic support (16) are welded and fixed to the crests and troughs of the corrugated metal sheets (15) respectively. The top of the outer shell (25) is provided with an airflow adjustment mechanism. The airflow adjustment mechanism includes an air inlet (17), a flow guide (18) and an adjustable damper (19). The air inlet (17) is located at the center of the top surface of the outer shell (25). The flow guide (18) is fixed below the air inlet (17) and communicates with the inside of the outer shell (25). The adjustable damper (19) is installed inside the flow guide (18) and is connected to the drive motor (23) through a rotating shaft (22).

2. The low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The cross-section of the nano-carbon fiber heat-conducting strip (6) is trapezoidal, and its width gradually increases from the surface of the insulating partition (4) towards the iron core (1). Its length is equal to the depth of the heat-conducting groove (5). The outer surface of the nano-carbon fiber heat-conducting strip (6) is coated with a layer of graphene coating (7).

3. The low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The heat pipe (10) is filled with liquid metal heat-conducting medium (11), and the outer wall of the heat pipe (10) is provided with a spiral groove (12). A ceramic fiber heat insulation layer (13) is embedded in the spiral groove (12). The diameter of the heat pipe (10) is 12 mm, and its length is consistent with the height of the heat dissipation substrate (8).

4. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The elastic support (16) is made of nickel-titanium alloy wire, and the two ends of the elastic support (16) are welded to the crest and trough of the corrugated metal sheet (15), respectively.

5. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The adjustable damper (19) is composed of multiple arc blades (20). The surface of the arc blades (20) is provided with micro-turbulence holes (21). The arc blades (20) are connected to the drive motor (23) through the rotating shaft (22). The drive motor (23) is fixed to the top of the guide shroud (18). The inner wall of the guide shroud (18) is provided with an annular guide rail (24). The annular guide rail (24) is slidably connected to the edge of the arc blades (20).

6. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The thermally conductive grooves (5) on the surface of the insulating partition (4) are uniformly distributed along the radial direction of the insulating partition (4), and the depth of the thermally conductive grooves (5) is consistent with the length of the nano-carbon fiber thermally conductive strip (6).

7. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The flow channels (9) on the inner surface of the heat dissipation substrate (8) are evenly distributed along the height direction of the heat dissipation substrate (8), and the width of the flow channels (9) is consistent with the diameter of the heat pipe (10).

8. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The wavy metal sheets (15) in the heat dissipation fin assembly (14) are kept at a fixed spacing by the elastic support (16).

9. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The central axis of the air inlet (17) coincides with the central axis of the deflector (18). The inner wall of the deflector (18) is provided with an annular guide rail (24), which is slidably connected to the edge of the arc blade (20).

10. A low-loss, energy-saving dry-type transformer according to claim 1, characterized in that: The output shaft of the drive motor (23) is fixedly connected to the rotating shaft (22), and the rotating shaft (22) passes through the center of the arc blade (20) and is fixedly connected to the arc blade (20).

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