Dry-type transformer

Abstract

The utility model discloses a dry -type transformer, including body mechanism and heat abstract mechanism, the body mechanism includes the core, low voltage coil, high voltage coil and insulating strut, the low voltage coil is set on the core, the high voltage coil is set on the low voltage coil, the insulating strut is provided with a plurality of and along the equidistance's clamping between low voltage coil and high voltage coil, the heat abstract mechanism includes longitudinal air channel, flow guide unit and air supply unit. The utility model discloses through the construction longitudinal air channel - flow guide groove - the three -dimensional heat abstract path of coil inside, makes the cooling gas can directly permeate to the high voltage coil inside deep region, has realized the optimization of heat dissipation from inside to outside, has solved the thermal resistance under the traditional heat dissipation mode under the premise of not increasing energy consumption and complex structure, has reduced the coil inside temperature and local hot spot while improved the heat dissipation efficiency, thereby has promoted the overload capacity, operation reliability and service life of transformer.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically relating to a dry-type transformer. Background Technology

[0002] Dry-type transformers are widely used in high-rise buildings, subways, airports, power plants, and other locations due to their advantages such as flame retardancy, explosion-proof properties, maintenance-free operation, and environmental friendliness. During operation, the core and coils (especially the low-voltage and high-voltage coils) of a dry-type transformer generate a significant amount of heat. If this heat cannot be dissipated in time, it can lead to excessively high local temperatures, accelerating the aging of insulation materials, reducing the transformer's lifespan, and even causing malfunctions.

[0003] Existing dry-type transformers typically dissipate heat by installing longitudinal ventilation channels in the core and coils, relying on natural air convection or forced air cooling. However, this heat dissipation method has limited efficiency, especially inside the transformer, where heat tends to accumulate in the middle and top of the coils, forming localized hot spots. Although some solutions employ forced cooling measures such as adding fans, this introduces problems with energy consumption, noise, and additional points of failure.

[0004] Therefore, it is necessary to provide a dry-type transformer to address the aforementioned technical problems.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a dry-type transformer that, through optimized structural design, enhances internal airflow and heat dissipation efficiency, especially improving the heat dissipation effect in the upper part of the coil.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows: A dry-type transformer includes a main body and a heat dissipation mechanism. The main body includes an iron core, a low-voltage coil, a high-voltage coil, and insulating supports. The low-voltage coil is sleeved on the iron core, and the high-voltage coil is sleeved on the low-voltage coil. Multiple insulating supports are provided and are equally spaced circumferentially between the low-voltage coil and the high-voltage coil. The heat dissipation mechanism includes a longitudinal air duct, a flow guiding unit, and an air supply unit. Multiple longitudinal air ducts are provided and are formed between the low-voltage coil and the high-voltage coil through multiple insulating supports. The flow guiding unit is used to deliver cold air into the high-voltage coil, and the air supply unit is used to provide cooling gas.

[0008] In one or more embodiments of the present invention, the main body mechanism further includes a base, a mounting base, an insulating cylinder, and a housing, wherein the base is disposed at the bottom of the iron core.

[0009] In one or more embodiments of this utility model, the mounting base is fixed on the base, and the iron core is mounted on the mounting base.

[0010] In one or more embodiments of this utility model, the insulating cylinder is installed between the high-voltage coil and the insulating support bar, and the outer shell is sleeved on the outside of the high-voltage coil.

[0011] In one or more embodiments of this utility model, the flow guiding unit includes a flow guiding groove, a vent hole, an air inlet hole, an air outlet hole, and an exhaust hole. The flow guiding groove is axially formed on the side wall of the insulating support bar facing the insulating cylinder.

[0012] In one or more embodiments of this utility model, multiple vent holes are provided on the insulating cylinder in a vertical and circumferentially distributed manner, and multiple air inlets are provided on the outer wall of the high-voltage coil in a manner corresponding to the multiple vent holes.

[0013] In one or more embodiments of this utility model, the vent and the inlet are arranged with the spacing gradually increasing from bottom to top, and the cross-section of the guide groove is arc-shaped or V-shaped.

[0014] In one or more embodiments of this utility model, multiple air outlets are provided at equal intervals on the top of the high-voltage coil, and multiple exhaust holes are provided at equal intervals on the outer side wall of the housing near the top, and the exhaust holes are inclined downwards from the inner side to the outer side of the housing.

[0015] In one or more embodiments of the present invention, the air supply unit includes an air supply chamber, a distribution hole and a blower, wherein the air supply chamber is opened in the mounting base and located at the bottom of the iron core.

[0016] In one or more embodiments of this utility model, the distribution holes are opened at the top of the gas delivery chamber and multiple holes are opened in a manner corresponding to the longitudinal air duct and the guide groove, and the blower is installed at the bottom of the gas delivery chamber.

[0017] Compared with existing technologies, this invention constructs a three-dimensional heat dissipation path from a longitudinal air duct to a guide groove to the inside of the coil, allowing cooling gas to directly penetrate into the deep area inside the high-voltage coil, thus optimizing heat dissipation from the inside out. Without increasing energy consumption or complex structure, it solves the thermal barrier problem of traditional heat dissipation modes, reduces the internal temperature of the coil and local hot spots, and improves heat dissipation efficiency, thereby enhancing the transformer's overload capacity, operational reliability, and service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of a dry-type transformer according to one embodiment of the present invention; Figure 2 This is a cross-sectional view of a dry-type transformer according to one embodiment of the present invention; Figure 3 This is a cross-sectional view of a dry-type transformer according to one embodiment of the present invention; Figure 4 This is a partial cross-sectional view of a dry-type transformer according to an embodiment of the present invention; Figure 5 This is a bottom cross-sectional view of a dry-type transformer according to one embodiment of the present invention; Figure 6 This utility model Figure 4 A schematic diagram of point A in the middle.

[0020] Explanation of key figure labels: 1-Main body structure, 11-Base, 12-Mounting seat, 13-Iron core, 14-Low voltage coil, 15-High voltage coil, 16-Insulating support bar, 17-Insulating cylinder, 18-Outer shell, 2-Heat dissipation mechanism, 21-Longitudinal air duct, 22-Guide groove, 23-Ventilation hole, 24-Inlet hole, 25-Outlet hole, 26-Exhaust hole, 27-Air delivery chamber, 28-Distribution hole, 29-Blower. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0022] like Figures 1-6As shown, a dry-type transformer according to one embodiment of the present invention includes a main body mechanism 1 and a heat dissipation mechanism 2. The main body mechanism 1 includes an iron core 13, a low-voltage coil 14, a high-voltage coil 15, and insulating support bars 16. The low-voltage coil 14 is sleeved on the iron core 13, and the high-voltage coil 15 is sleeved on the low-voltage coil 14. Multiple insulating support bars 16 are provided and are sandwiched between the low-voltage coil 14 and the high-voltage coil 15 at equal intervals along the circumference. The heat dissipation mechanism 2 includes a longitudinal air duct 21, a flow guiding unit, and an air supply unit. Multiple longitudinal air ducts 21 are provided and are formed between the low-voltage coil 14 and the high-voltage coil 15 through multiple insulating support bars 16. The flow guiding unit is used to transport cold air into the high-voltage coil 15, and the air supply unit is used to provide cooling gas.

[0023] When this dry-type transformer is in use, the longitudinal air duct 21 formed between the low-voltage coil 14 and the high-voltage coil 15 by multiple insulating support bars 16 serves as a flow channel for cold air. Under the action of the flow guiding unit, a transverse cooling path is constructed from the longitudinal air duct 21 to the interior of the high-voltage coil 15. This path works in conjunction with the original longitudinal air duct, utilizing the chimney effect generated by the natural rise of hot air to drive the external cold air to rise vertically along the main air duct longitudinal air duct 21. At the same time, part of the airflow is guided by the flow guiding unit to directly enter the interlayer gap inside the high-voltage coil 15 for efficient heat exchange, thereby carrying away the heat accumulated deep in the coil from the inside out and finally discharging it through the top. This achieves a fundamental optimization of traditional surface heat dissipation, significantly improves the overall heat dissipation efficiency, and effectively eliminates local hot spots.

[0024] like Figures 1-4 As shown, the main body mechanism 1 also includes a base 11, a mounting base 12, an insulating cylinder 17, and a housing 18. The base 11 is located at the bottom of the iron core 13.

[0025] like Figures 1-4 As shown, the mounting base 12 is fixed on the base 11, and the iron core 13 is mounted on the mounting base 12. The base 11 serves as the bottom support and mounting component of the dry-type transformer, enabling the dry-type transformer to be installed stably. The mounting base 12 is used for the installation and support of the main components of the dry-type transformer.

[0026] like Figures 2-5 As shown, the insulating cylinder 17 is installed between the high-voltage coil 15 and the insulating support bar 16. As the main insulating component between the high-voltage coil 15 and the low-voltage coil 14, the insulating cylinder 17 bears most of the working voltage and impulse voltage, and is the core structure to ensure the electrical safety of the transformer. The outer shell 18 is fitted onto the outside of the high-voltage coil 15, and the outer shell 18 is used for the safety protection of the internal components of the transformer.

[0027] like Figures 4-6As shown, the flow guiding unit includes a flow guiding groove 22, a vent 23, an air inlet 24, an air outlet 25, and an exhaust outlet 26. The flow guiding groove 22 is axially opened on the side wall of the insulating support bar 16 facing the insulating cylinder 17, so that cold air can flow through the flow guiding groove 22 in the insulating support bar 16.

[0028] like Figures 4-6 As shown, multiple vent holes 23 are provided on the insulating cylinder 17 in a vertical and circumferential manner, and multiple air inlets 24 are provided on the outer wall of the high-voltage coil 15 in a manner corresponding to the multiple vent holes 23. This allows the air flowing in the guide groove 22 to flow laterally through the vent holes 23 and the air inlets 24, so that the cold air in the guide groove 22 can pass through the vent holes 23 and the air inlets 24 in sequence through the outer wall of the insulating cylinder 17 and the high-voltage coil 15 and enter the interlayer gap inside the high-voltage coil 15 for efficient heat exchange.

[0029] like Figures 4-6 As shown, both the vent 23 and the inlet 24 are arranged with gradually increasing spacing from bottom to top, maximizing the amount of cold air flowing in the guide channel 22 that enters the bottom of the high-voltage coil 15, thereby improving the cooling effect on the high-voltage coil 15. The cross-section of the guide channel 22 is arc-shaped or V-shaped to increase the amount of cold air delivered by the guide channel 22.

[0030] like Figures 4-6 As shown, multiple vents 25 are evenly spaced on the top of the high-voltage coil 15. The cold air entering the high-voltage coil 15 absorbs the heat inside the coil and is then discharged through the vents 25. Multiple exhaust vents 26 are evenly spaced on the outer wall of the outer casing 18 near the top. The exhaust vents 26 are inclined downwards from the inside to the outside of the outer casing 18, allowing the hot air after heat exchange to be discharged to the outside. At the same time, the inclined arrangement of the exhaust vents 26 prevents the entry of external moisture.

[0031] like Figure 3 and Figure 4 As shown, the air supply unit includes an air supply chamber 27, a distribution hole 28, and a blower 29. The air supply chamber 27 is opened in the mounting base 12 and is located at the bottom of the iron core 13.

[0032] like Figure 3 and Figure 4 As shown, multiple distribution holes 28 are provided at the top of the gas delivery chamber 27, corresponding to the longitudinal air duct 21 and the guide groove 22. The blower 29 is installed at the bottom of the gas delivery chamber 27. The blower 29 draws cold air from the outside into the gas delivery chamber 27, and then the cold air is discharged through the multiple distribution holes 28 and delivered into the longitudinal air duct 21 and the guide groove 22, so that the cold air can efficiently cool the internal components of the transformer.

[0033] In use, the blower 29 draws cold air from the outside into the air delivery chamber 27, and then the cold air is delivered to the longitudinal air duct 21 and the guide channel 22 through the distribution hole 28. When the air flows in the guide channel 22, it will pass laterally through the vent hole 23 and the air inlet 24 and enter the high-voltage coil 15. This path works in conjunction with the original longitudinal air duct, using the chimney effect generated by the natural rise of hot air to drive the external cold air to rise vertically along the main air duct longitudinal air duct 21. At the same time, part of the airflow is guided by the guide unit to directly enter the interlayer gap inside the high-voltage coil 15 for efficient heat exchange, thereby taking away the heat accumulated deep in the coil from the inside to the outside, and finally exhausting it through the top. This achieves a fundamental optimization of traditional surface heat dissipation, significantly improves the overall heat dissipation efficiency and effectively eliminates local hot spots.

[0034] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dry-type transformer, characterized in that, include: The main body structure includes an iron core, a low-voltage coil, a high-voltage coil, and insulating support bars. The low-voltage coil is sleeved on the iron core, the high-voltage coil is sleeved on the low-voltage coil, and multiple insulating support bars are provided and are equally spaced along the circumference between the low-voltage coil and the high-voltage coil. The heat dissipation mechanism includes a longitudinal air duct, a flow guiding unit, and an air supply unit. The longitudinal air duct is provided in multiple ways and is formed between the low-voltage coil and the high-voltage coil by multiple insulating support bars. The flow guiding unit is used to deliver cold air into the high-voltage coil, and the air supply unit is used to provide cooling gas.

2. A dry-type transformer according to claim 1, characterized in that, The main body also includes a base, a mounting base, an insulating cylinder, and a housing, with the base located at the bottom of the iron core.

3. A dry-type transformer according to claim 2, characterized in that, The mounting base is fixed on the base, and the iron core is mounted on the mounting base.

4. A dry-type transformer according to claim 3, characterized in that, The insulating cylinder is installed between the high-voltage coil and the insulating support bar, and the outer shell is fitted over the outside of the high-voltage coil.

5. A dry-type transformer according to claim 4, characterized in that, The flow guiding unit includes a flow guiding groove, a vent hole, an air inlet, an air outlet, and an exhaust hole. The flow guiding groove is axially formed on the side wall of the insulating support bar facing the insulating cylinder.

6. A dry-type transformer according to claim 5, characterized in that, The ventilation holes are provided in multiple ways and are distributed vertically and circumferentially on the insulating cylinder. The air inlets are provided in multiple ways and are provided on the outer wall of the high-voltage coil in a manner corresponding to the multiple ventilation holes.

7. A dry-type transformer according to claim 6, characterized in that, The vents and inlets are arranged with increasing spacing from bottom to top, and the cross-section of the guide groove is arc-shaped or V-shaped.

8. A dry-type transformer according to claim 7, characterized in that, Multiple vent holes are provided at equal intervals on the top of the high-voltage coil, and multiple exhaust holes are provided at equal intervals on the outer side wall of the housing near the top. The exhaust holes are inclined downwards from the inside to the outside of the housing.

9. A dry-type transformer according to claim 8, characterized in that, The air supply unit includes an air supply chamber, a distribution hole, and a blower. The air supply chamber is located inside the mounting base and at the bottom of the iron core.

10. A dry-type transformer according to claim 9, characterized in that, The distribution holes are located at the top of the gas delivery chamber and are provided in multiple manner corresponding to the longitudinal air duct and the guide groove. The blower is installed at the bottom of the gas delivery chamber.

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