阅读说明：本技术 一种高过载干式变压器 (High-overload dry-type transformer ) 是由 张军海 彭景伟 余小平 叶彪 莫向松 郭敬旺 罗军 廖冬虹 董记斌 吕棱 于 2021-06-10 设计创作，主要内容包括：本发明提供了一种高过载干式变压器,包括变压器本体,变压器本体包括铁芯本体和绕设于铁芯本体上的绕组,绕组包括线圈和绝缘封装层,绝缘封装层包覆线圈,绝缘封装层渗入线圈的匝间间隙和层间间隙,将绕组固化为一体；风道,风道的一端为进风口、另一端为出风口,风道的出风口处设有出风罩,出风罩朝向变压器本体；水箱,与风道连通,用于存储冷却液；雾化器,设置于水箱内,用于雾化冷却液；风机,与风道的进风口连接,用于向风道送风。在高过载干式变压器中,借助雾化器雾化冷却液,雾化所形成的雾气进入风道随空气移动,雾气与空气混合后形成新的气流,气流具有更高的吸热效率及更高的比热容,能够提高对绕组的散热效果,提高变压器高过载性能。(The invention provides a high-overload dry-type transformer, which comprises a transformer body, wherein the transformer body comprises an iron core body and a winding wound on the iron core body, the winding comprises a coil and an insulating packaging layer, the insulating packaging layer covers the coil, and the insulating packaging layer permeates into a turn-to-turn gap and an interlayer gap of the coil and solidifies the winding into a whole; the transformer comprises an air duct, an air inlet is formed in one end of the air duct, an air outlet is formed in the other end of the air duct, an air outlet cover is arranged at the air outlet of the air duct, and the air outlet cover faces the transformer body; the water tank is communicated with the air channel and used for storing cooling liquid; the atomizer is arranged in the water tank and used for atomizing the cooling liquid; and the fan is connected with the air inlet of the air duct and used for supplying air to the air duct. In the high overload dry-type transformer, the cooling liquid is atomized by means of the atomizer, the atomized mist enters the air channel and moves along with the air, new air flow is formed after the mist and the air are mixed, the air flow has higher heat absorption efficiency and higher specific heat capacity, the heat dissipation effect on a winding can be improved, and the high overload performance of the transformer is improved.)

1. A high overload dry transformer, comprising:

the transformer comprises a transformer body and a winding, wherein the transformer body comprises an iron core body and a winding wound on the iron core body, the winding comprises a coil and an insulating packaging layer, the insulating packaging layer wraps the coil, and the insulating packaging layer permeates into inter-turn gaps and interlayer gaps of the coil to solidify the winding into a whole;

the transformer comprises an air duct, an air inlet is formed in one end of the air duct, an air outlet is formed in the other end of the air duct, an air outlet cover is arranged at the air outlet of the air duct, and the air outlet cover faces the transformer body;

the water tank is communicated with the air channel and is used for storing cooling liquid;

the atomizer is arranged in the water tank and used for atomizing cooling liquid;

and the fan is connected with the air inlet of the air duct and used for supplying air to the air duct.

2. A high-overload dry-type transformer according to claim 1, wherein: the coil is formed by winding a wire around the iron core body, and the wire comprises a wire core and an insulating layer arranged on the surface layer of the wire core.

3. A high-overload dry-type transformer according to claim 1, wherein: the coil is formed by winding a wire around the iron core body, and the wire comprises a wire core and a plurality of layers arranged on the insulating layer on the surface layer of the wire core.

4. A high-overload dry transformer as claimed in claim 3 wherein: and the wire core is sequentially subjected to vacuum impregnation and solidification by a high-temperature liquid insulating material, and a plurality of insulating layers are formed on the surface layer of the wire core.

5. The high-overload dry transformer of claim 4, wherein: the insulating layer is made of insulating paint or epoxy resin, and the insulating packaging layer is made of epoxy resin or silicon rubber.

6. High-overload dry transformer according to any one of claims 1 to 5, characterised in that: and ventilation holes extending along the axial direction are formed in the winding.

7. The high-overload dry transformer of claim 6, wherein: the coil includes the low voltage coil and is located low voltage coil outlying high voltage coil, the winding still including being located high voltage coil with be equipped with the spacer between the low voltage coil, the ventilation hole set up in on the spacer.

8. A high-overload dry-type transformer according to claim 7, wherein: and a heat dissipation gap for objective airflow to pass through is reserved between the iron core body and the low-voltage coil.

9. High-overload dry transformer according to any one of claims 1 to 5, characterised in that: the high-overload dry-type transformer further comprises a controller and a temperature sensor, the temperature sensor is connected with the winding to sense the temperature of the winding, the controller is connected with the temperature sensor to receive a temperature signal transmitted by the temperature sensor, and the controller is further in electric signal connection with the atomizer and the fan to control the atomizer and the fan to work.

10. The high-overload dry transformer of claim 5, wherein: the atomizer is an ultrasonic atomizer.

Technical Field

The invention relates to a transformation device, in particular to a high-overload dry-type transformer.

Background

The dry-type transformer is mainly used for local power grid transformation and is widely used in factories, high-rise buildings, airports, wharfs and other places. The dry type transformer is a transformer in which the core and the winding are not immersed in insulating oil. The cooling of dry-type transformers typically includes natural air cooling and forced air cooling. When the transformer runs for a long time under the rated capacity, the transformer is radiated in a natural air cooling mode. When the transformer is in an overload state, the output capacity of the transformer is increased, the heat is increased, and the transformer is radiated in a forced air cooling mode. The heat dissipation performance of the dry-type transformer affects the overload resistance. In the prior art, the dry-type transformer is generally subjected to air cooling, and the problem of poor heat dissipation effect exists in the mode, so that the overload resistance of the dry-type transformer is low.

Disclosure of Invention

In order to overcome the defects of the prior art, an object of the present invention is to provide a high overload dry-type transformer, so as to solve the technical problems of poor heat dissipation effect and low overload resistance of the dry-type transformer in the prior art.

One of the purposes of the invention is realized by adopting the following technical scheme:

a high overload dry transformer comprising:

the transformer comprises a transformer body and a winding, wherein the transformer body comprises an iron core body and a winding wound on the iron core body, the winding comprises a coil and an insulating packaging layer, the insulating packaging layer wraps the coil, and the insulating packaging layer permeates into inter-turn gaps and interlayer gaps of the coil to solidify the winding into a whole;

the transformer comprises an air duct, an air inlet is formed in one end of the air duct, an air outlet is formed in the other end of the air duct, an air outlet cover is arranged at the air outlet of the air duct, and the air outlet cover faces the transformer body;

the water tank is communicated with the air channel and is used for storing cooling liquid;

the atomizer is arranged in the water tank and used for atomizing cooling liquid;

and the fan is connected with the air inlet of the air duct and used for supplying air to the air duct.

Optionally, the coil is formed by the wire around the iron core body around establishing, the wire include the sinle silk with set up in the insulating layer on sinle silk top layer.

Optionally, the coil is formed by winding a wire around the iron core body, and the wire comprises a wire core and a plurality of layers arranged on the insulating layer on the surface layer of the wire core.

Optionally, the wire core is sequentially subjected to vacuum impregnation and curing by a high-temperature liquid insulating material, and a plurality of insulating layers are formed on the surface layer of the wire core.

Optionally, the insulating layer is insulating paint or epoxy resin, and the insulating encapsulation layer is epoxy resin or silicone rubber.

Optionally, an axially extending vent is provided in the winding.

Optionally, the coil includes a low-voltage coil and a high-voltage coil located at the periphery of the low-voltage coil, the winding further includes a spacer located between the high-voltage coil and the low-voltage coil, and the vent hole is disposed on the spacer.

Optionally, a heat dissipation gap through which objective airflow passes is reserved between the iron core body and the low-voltage coil.

Optionally, the high-overload dry-type transformer further includes a controller and a temperature sensor, the temperature sensor is connected to the winding to sense the temperature of the winding, the controller is connected to the temperature sensor to receive a temperature signal transmitted by the temperature sensor, and the controller is further electrically connected to the atomizer and the fan to control the atomizer and the fan to operate.

Optionally, the nebulizer is an ultrasonic nebulizer.

Compared with the prior art, the invention has the beneficial effects that:

in the high overload dry-type transformer, the cooling liquid is atomized by the atomizer, the atomized fog enters the air channel and moves along with the air, the fog and the air are mixed to form new air flow, and the air flow flows to the transformer body to cool the transformer body, particularly a cooling winding. The air flow in the invention has higher heat conduction efficiency, when fog is contacted with the winding, the air flow can absorb the heat of the winding more easily and has higher specific heat capacity, and under the condition of the same mass, more heat can be absorbed, therefore, the air flow in the embodiment has higher heat absorption efficiency and higher specific heat capacity, the heat dissipation effect on the winding can be improved, and the high overload performance of the transformer can be improved.

Drawings

Fig. 1 is a schematic structural view of a high overload dry type transformer of the present invention;

fig. 2 is a schematic diagram of the structure of the winding in the high overload dry-type transformer of the present invention;

fig. 3 is another schematic structural diagram of the winding in the high overload dry type transformer of the present invention;

fig. 4 is a schematic transverse cross-sectional view of the windings in the high overload dry transformer of the present invention;

fig. 5 is a control schematic diagram of the high overload dry transformer of the present invention.

In the figure:

1. a transformer body; 111. an upper iron yoke; 112. a lower iron yoke; 113. a stem; 12. a winding; 13. an insulating encapsulation layer; 14. a coil; 141. a low-voltage coil; 142. a high-voltage coil; 15. a spacer; 151. a vent hole; 16. a heat dissipation gap;

2. an air duct; 3. a water tank; 4. a fan; 5. an air outlet cover; 6. a controller; 7. a temperature sensor; 8. an atomizer; 9. a baffle plate; 91. and an air outlet pipe.

Detailed Description

The present invention will be further described with reference to fig. 1 to 5 and the detailed description thereof, and it should be noted that, in the case of conflict, any combination of the embodiments or technical features described below may form a new embodiment.

As shown in fig. 1 and 2, the invention provides a high-overload dry-type transformer, which includes a transformer body 1, an air duct 2, a water tank 3, an atomizer 8 and a fan 4.

The transformer body 1 comprises an iron core body and a winding 12 wound on the iron core body, wherein the winding 12 comprises a coil 14 and an insulating packaging layer 13, the coil 14 is wound on the iron core body, the insulating packaging layer 13 coats the coil 14, and the insulating packaging layer 13 permeates into inter-turn gaps and interlayer gaps of the coil 14 to solidify the winding 12 into a whole. The one end in wind channel 2 is the air intake, and the other end in wind channel 2 is the air outlet, and the air outlet department in wind channel 2 is equipped with out fan housing 5, goes out fan housing 5 towards transformer body 1. Air and mist in the following are guided to flow to the transformer body 1 through the air duct 2, and meanwhile, a place is provided for mixing the air and the mist. The water tank 3 is filled with cooling liquid, and the space in the water tank 3 is communicated with the air duct 2. The cooling liquid may be water or other liquid with high specific heat capacity and volatility. The atomizer 8 is provided in the water tank 3 for atomizing the coolant in the water tank 3. The water tank 3 is communicated with the air duct 2, and the atomized coolant flows into the air duct 2 to supply mist to the air duct 2. The fan 4 is connected with the air duct 2 and used for supplying air to the air duct 2. In this embodiment, the insulating encapsulation layer 13 is disposed on the surface layer of the coil 14, and the insulating encapsulation layer 13 completely covers the coil 14, so as to protect the coil 14, avoid the exposure of the coil 14, and greatly improve the sealing property and the insulating property of the coil 14. The cooling liquid is atomized by means of the atomizer 8, the atomized mist enters the air duct 2 and moves along with the air, the mist and the air are mixed to form a new air flow, and the air flow flows towards the transformer body 1 to cool the transformer body 1, specifically the winding 12. On the one hand, the heat conduction efficiency of the liquid is higher, and thus the mist is a fine granular liquid in nature, and thus the mist has a higher heat conduction efficiency, and the mist absorbs the heat of the winding 12 more easily when contacting the winding 12. On the other hand, the cooling liquid has higher specific heat capacity than air, and under the condition of the same mass, more heat can be absorbed, and the cooling liquid is fine granular liquid, and the mass of the cooling liquid is also far greater than the air with the same volume, so that the mixed air flow of the air mist greatly improves the specific heat capacity of the air flow, and the fluid with the same volume can take away more heat than the air with the same volume. Therefore, the air flow in the embodiment has higher heat absorption efficiency and higher specific heat capacity, the heat dissipation effect on the winding 12 can be improved, and the high overload performance of the transformer is improved.

In this embodiment, the insulating encapsulation layer 13 covers the coil 14, and isolates the coil 14 from the external environment, that is, isolates the coil 14 from mist in the air flow, thereby improving the insulation of the winding 12.

In some embodiments, the winding 12 is formed by winding a wire around the core body, wherein the wire includes a core (not shown) and an insulating layer (not shown) disposed on a surface of the core. In this embodiment, the insulation layer is provided on the surface layer of the core, thereby further improving the insulation of the winding 12.

In order to further improve the insulation performance, a plurality of insulation layers are provided on the surface layer of the core.

In some embodiments, for the insulation layer, the core is subjected to an insulation layer forming process to form the insulation layer on a surface layer of the core. Specifically, the molding process includes two process steps of vacuum impregnation and curing of the high-temperature liquid insulating material. Vacuum impregnation and solidification make insulating material can evenly distributed in the top layer of sinle silk for the insulating layer thickness on sinle silk top layer is even, and the insulating properties of sinle silk each position is the same or similar.

When the surface layer of the wire core is provided with a plurality of insulating layers, the wire core is subjected to the forming process for a plurality of times, and the plurality of insulating layers are formed on the surface layer of the wire core.

In some embodiments, the insulating layer is an insulating varnish or epoxy resin, and the insulating encapsulation layer 13 is an epoxy resin or silicone rubber.

In some embodiments, as shown in fig. 4, axially extending vent holes 151 are provided in the windings 12. The ventilation holes 151 in the winding 12 allow air or air flow to enter the ventilation holes 151, and heat of the winding 12 is taken away from the inside of the winding 12, so that the heat dissipation area is increased, and the heat dissipation efficiency is improved.

In some embodiments, as shown in fig. 3 and 4, the coil 14 includes a low voltage coil 141 and a high voltage coil 142 located at the periphery of the low voltage coil 141, the winding 12 further includes a spacer 15 located between the high voltage coil 142 and the low voltage coil 141, and the vent 151 is disposed on the spacer 15. In this embodiment, the low voltage coil 141 and the high voltage coil 142 can keep the original shapes, so as to avoid the modification of the low voltage coil 141 and the high voltage coil 142, and reduce the improvement cost. The spacer 15 is a structure for dividing the low voltage coil 141 and the high voltage coil 142, and has a small restriction on the structural change thereof, and the ventilation hole 151 is easily provided, which makes the improvement simpler.

The aforementioned insulating encapsulation layer 13 encapsulates the coil 14, and more specifically, as shown in fig. 3, the insulating encapsulation layer 13 includes two parts, one part of the insulating encapsulation layer 13 encapsulates the low voltage coil 141, and the other part of the insulating encapsulation layer 13 encapsulates the high voltage coil 142.

Of course, in some embodiments, ventilation channels extending in the axial direction may be further provided on the low voltage coil 141 and the high voltage coil 142 to improve the heat dissipation performance of the low voltage coil 141 and the high voltage coil 142 themselves.

In some embodiments, a heat dissipation gap 16 for airflow to pass through is reserved between the iron core body and the low-voltage coil 141. In order to further increase the heat dissipation area, in this example, a heat dissipation gap 16 is reserved between the iron core body and the low-voltage coil 141, so that air or airflow can pass through the heat dissipation gap 16 between the low-voltage coil 141 and the iron core body, and the heat dissipation effect is further improved.

In some embodiments, in order to prevent the liquid particles in the mist from adhering to and penetrating into the core body, in this embodiment, the surface of the core body is provided with an insulating layer to isolate the external environment.

In some embodiments, as shown in fig. 5, the high overload dry-type transformer further includes a controller 6 and a temperature sensor 7, the temperature sensor 7 is connected to the winding 12 to sense the temperature of the winding 12, the controller 6 is connected to the temperature sensor 7 to receive a temperature signal transmitted from the temperature sensor 7, and the controller 6 is further electrically connected to the atomizer 8 and the fan 4 to control the operation of the atomizer 8 and the fan 4. In this embodiment, the temperature of the winding 12 is sensed by the temperature sensor 7, and the controller 6 receives the temperature signal transmitted by the temperature sensor 7, and the controller 6 controls the atomizer 8 to operate according to the temperature signal.

Specifically, when the temperature of the winding 12 is within a first temperature range, the controller 6 controls the fan 4 and the atomizer 8 to be turned off; when the temperature of the winding 12 is in a second temperature range, the fan 4 is started, and the atomizer 8 is shut down; when the temperature of the winding 12 is within the third temperature range, the fan 4 is turned on and the atomizer 8 is turned on. In a second temperature range the controller 6 can control the fan 4 to operate at different powers, and likewise in a third temperature range the controller 6 can control the fan 4 and the atomiser 8 to operate at different powers. The first temperature range, the second temperature range and the third temperature range are preset values, and can be preset for different application places.

Therefore, in the embodiment, the temperature sensor 7 and the controller 6 cooperate to control the switch of the fan 4 and the switch of the atomizer 8 to be turned off at different temperatures, and cooperate with proper power to work, so that the energy efficiency and the working efficiency are improved.

In some embodiments, the nebulizer 8 is an ultrasonic nebulizer 8.

The air outlet cover 5 is disposed below the winding 12 and above the lower yoke 112, and has a funnel shape, and an opening of the air outlet cover 5 faces the winding 12.

For the size of wind channel 2 is less than the size of the 5 openings in wind-out cover, there is the uneven problem of air-out, specifically, the air output that is close to 2 air outlets in wind channel position is big, and the air output that is far away from 2 air outlets in wind channel position is little. In some embodiments, an air outlet plate (not shown) is disposed inside the air outlet housing 5, and a plurality of air outlet holes (not shown) for adjusting the air outlet position are disposed on the air outlet plate.

Further, among a plurality of exhaust vents, partial air outlet is towards aforementioned ventilation hole 151 and heat dissipation clearance 16, so, the air current flows out the back from the exhaust vent, can directly get into ventilation hole 151 and heat dissipation clearance 16, increases ventilation hole 151 and heat dissipation clearance 16's air volume, has improved the radiating effect.

In some embodiments, the dry-type transformer further includes a baffle 9 disposed above the winding 12, and specifically, the core body includes an upper yoke 111, a lower yoke 112 and a core leg 113, the core leg 113 is located between the upper yoke 111 and the lower yoke 112, the winding 12 is wound on the core leg 113, the baffle 9 is located above the winding 12 and below the upper yoke 111, and the baffle 9 is wound on the core leg 113 above the winding 12, so that the baffle 9 blocks the air flow from directly impacting the upper yoke 111, and prevents the mist in the air flow from affecting the upper yoke 111.

Further, the baffle plate 9 is formed in a hood shape, and an air outlet pipe 91 is further provided on the baffle plate 9 so as to guide the flow of air to avoid the upper iron yoke 111.

In the present invention, the baffle 9 is provided above the winding 12, and the air outlet cover 5 is provided below the winding 12, so that most of the winding 12 is exposed, and therefore, the dry-type transformer can be naturally cooled by air.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.