CN119811836A - A box-type transformer high and low voltage winding ventilation cooling structure - Google Patents

Abstract

The present invention relates to a ventilation and cooling structure for high and low voltage windings of a box-type transformer, comprising a transformer box, a transformer three-phase barrel, an iron core, an upper iron core clamp, a lower iron core clamp and a lower wind shield. A plurality of transformer three-phase barrels are provided, and each transformer three-phase barrel is arranged around the iron core; the iron core is arranged in the transformer box through an upper iron core clamp and a lower iron core clamp; the lower wind shield is fixedly arranged in the transformer box, and the lower wind shield divides the transformer box into an upper air outlet and a lower air supply; the upper air supply and lower air outlet of the transformer box are both provided with a plurality of air outlets; and a plurality of ventilation channels are provided in the transformer three-phase barrel along the axial direction. The advantages of the present invention are: by increasing the heat dissipation area of epoxy resin and air convection, the heat dissipation efficiency of each winding is improved; by reasonably designing the air circulation path, the air is fully utilized to take away the heat, so that the temperature rise of the iron core and the winding is suppressed.

Description

Ventilation cooling structure for high-low voltage winding of box-type transformer

Technical Field

The invention relates to the technical field of transformer winding encapsulation, in particular to a ventilation cooling structure for a high-low voltage winding of a box-type transformer.

Background

The transformer has a complex structure and is a core of the power system, and the running state of the transformer is related to whether the whole power system can run stably or not. When the transformer operates, the internal iron core, the coil, the metal components and the like have losses, the load changes to change the losses of the transformer correspondingly, all the losses cause the transformer to generate heat and the temperature to rise, the efficiency of the transformer is reduced due to the excessively high temperature, the service life of the transformer is shortened, and the analysis shows that whether the transformer can normally work in the transformer cooling system plays a decisive role.

The traditional transformer air cooling system box adopts a closed design, the utilization rate of a fluid domain in the box is low, the transformer is easy to be failed due to the temperature rise, and the reliability of the transformer is reduced. At present, the manufacturing of iron cores by high-permeability oriented silicon steel sheets and grain-oriented silicon steel sheets has significantly improved the material properties, electrical and structural properties of silicon steel transformers. However, the problem of high loss caused by the iron core and the winding is not solved effectively, and a ventilation cooling structure for high-voltage and low-voltage windings of a box-type transformer is required to be provided.

Disclosure of Invention

Object of the Invention

In the prior art, a box-type transformer adopts a closed design, an inner space is relatively closed, a heat dissipation surface area is limited, heat dissipation efficiency is lower than that of an open-type transformer, and temperature rise problem can be caused during long-time operation or high load, so that the performance and service life of the transformer are affected. In order to solve the problems, the invention provides a novel cooling system for a high-low voltage winding by adopting an epoxy resin encapsulating technology, which improves the heat dissipation efficiency of windings in each encapsulation by increasing the convection heat dissipation area of epoxy resin and air, and secondly, takes full use of air to take away heat by reasonably designing an air circulation path. The heat dissipation area and the air utilization rate are increased, and the heat dissipation efficiency of the winding is improved.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a ventilation cooling structure for high-low voltage windings of a box-type transformer comprises a transformer box body, a transformer three-phase cylinder, an iron core upper clamping piece, an iron core lower clamping piece and a lower wind shield;

The transformer three-phase barrels are arranged in a plurality, and each transformer three-phase barrel is arranged on the iron core in a surrounding mode;

the iron core is arranged in the transformer box body through an upper iron core clamping piece and a lower iron core clamping piece;

the transformer box body is also provided with a power distribution cabinet baffle, and the transformer box body partitions the three-phase cylinder of the transformer in the transformer box body from the high-voltage and low-voltage power distribution cabinet through the power distribution cabinet baffle;

The lower wind shield is fixedly arranged in the transformer box body, the lower wind shield divides the transformer box body into an upper air outlet part and a lower air supply part, and the lower wind shield is sleeved on the outer wall of the three-phase cylinder of the transformer;

an upper air outlet part of the transformer box body is provided with an upper row of air outlets and a lower row of air outlets;

a plurality of ventilation channels are axially formed in the epoxy encapsulation cylinder of the high-voltage winding of the three-phase cylinder of the transformer.

As a further description of the scheme, the upper iron core clamping piece comprises two fixing plates and a first connecting bolt, wherein the two fixing plates are arranged in parallel, and two ends of the fixing plates are fixedly arranged in the transformer box body;

The lower iron core clamping piece and the upper iron core clamping piece are identical in structure, the lower iron core clamping piece comprises two fixing plates and second connecting bolts, the two fixing plates are arranged in parallel, two ends of each fixing plate are fixedly arranged in a transformer box body, the two fixing plates are connected through the second connecting bolts, and when the iron core is installed, the two fixing plates of the lower iron core clamping piece are fixed with the lower portion of the iron core through the second connecting bolts.

According to the technical scheme, the lower wind shield is provided with a hole matched with a transformer three-phase cylinder, the transformer three-phase cylinder is a low-voltage winding epoxy potting cylinder, a low-voltage winding insulation cylinder, a high-voltage winding epoxy potting cylinder and a high-voltage outer insulation cylinder from inside to outside, the lower part of the high-voltage outer insulation cylinder is fixedly connected with the inner wall of the hole of the lower wind shield, a plurality of through ventilation channels are arranged in the high-voltage winding epoxy potting cylinder at intervals, the ventilation channels are arranged in the height direction of the high-voltage winding epoxy potting cylinder, first bulges are arranged on the outer wall and the inner wall of the high-voltage winding epoxy potting cylinder at intervals in the circumferential direction, each two adjacent first bulges form a first ventilation groove, the inner wall and the outer wall of the low-voltage winding epoxy potting cylinder are respectively provided with a plurality of second bulges at intervals in the circumferential direction, each second bulge is arranged in the height direction of the low-voltage winding epoxy potting cylinder, each second bulge is formed into a trapezoid-shaped second bulge, a trapezoid-shaped bulge or a trapezoid-shaped section, and each second bulge is formed in the shape of a trapezoid.

As a further description of the scheme, the ventilation cooling structure for the high-low voltage winding of the box-type transformer further comprises an upper end pressing block and a lower end pressing block, wherein a plurality of upper end pressing blocks are arranged, each upper end pressing block comprises a pressing block body and a rib plate, a clamping groove is formed in the bottom of the pressing block body, and the pressing block body is matched with the top of the low-voltage winding insulating cylinder or the high-voltage winding insulating cylinder in a clamping manner through the clamping groove;

The lower end pressing blocks are provided with a plurality of pressing block bodies, each lower end pressing block comprises a pressing block body and a rib plate, clamping grooves are formed in the tops of the pressing block bodies, the pressing block bodies are matched with the tops of the low-voltage winding insulating cylinders or the high-voltage winding insulating cylinders in a clamping mode through the clamping grooves, the rib plates are fixedly arranged on the bodies through bolts, and the rib plates are fixedly connected with the fixing plates of the iron core lower clamping pieces.

According to the scheme, the insulation wind shields are arranged at the bottoms of the low-voltage winding insulation cylinder and the high-voltage winding insulation cylinder, clamping grooves matched with the insulation wind shields are formed in the tops of the lower end pressing blocks, and the lower end pressing blocks are matched with the insulation wind shields in a clamping mode.

As further description of the scheme, the ventilation cooling structure for the high-low voltage winding of the box-type transformer further comprises an upper part flow wind shield, one end of the upper part flow wind shield is fixedly arranged in the transformer box, the other end of the upper part flow wind shield is in butt joint with the side wall of the fixing plate of the upper clamping piece of the iron core, the upper part flow wind shield is located above the lower part wind shield, the air outlets comprise an upper air outlet and a lower air outlet, the upper air outlet and the lower air outlet are symmetrically arranged above and below the upper part flow wind shield, and the bottom height of the lower air outlet is higher than the top height of the three-phase barrel of the transformer.

According to the transformer box body, when the transformer box body is cooled, a cooling air path comprises an upper end air outlet system and a lower end air outlet system, the lower end air outlet system is formed by a lower air supply part, the lower air supply part passes through a front half gap between the inner side of an insulation cylinder at the outer side of a high-voltage winding and the outer side of an epoxy encapsulation cylinder at the high-voltage winding, the front half gap between the inner side of the epoxy encapsulation cylinder at the high-voltage winding and the outer side of the epoxy encapsulation cylinder at the low-voltage winding, the front half gap between the inner side of the epoxy encapsulation cylinder at the low-voltage winding and the outer surface of an iron core is discharged out of the box body through a lower air outlet through a diversion effect of an upper flow wind deflector, and the upper end air outlet system is formed by a lower air supply part, the lower half gap between the inner side of the insulation cylinder at the outer side of the high-voltage winding and the outer side of the epoxy encapsulation cylinder at the high-voltage winding, the rear half gap between the inner side of the epoxy encapsulation cylinder at the high-voltage winding and the outer side of the epoxy encapsulation cylinder at the low-voltage winding, and the rear half gap between the inner side of the epoxy encapsulation cylinder at the outer surface of the iron core is discharged out of the box body through the upper air outlet through a diversion effect of the upper flow deflector.

As further description of the scheme, four layers of round grooves are formed in the wind shield at the upper end of the insulating cylinder and are fixed with the four layers of high-voltage low-voltage main insulating cylinders, the wind shield at the upper end of the insulating cylinder is assembled with four groups of upper end pressing blocks, and a trapezoid wind shielding structure is arranged on the inner side and the outer side of the wind shield at the upper end of the insulating cylinder.

The invention has the advantages and effects that:

1. The novel cooling system adopting the epoxy resin encapsulation technology improves the heat dissipation efficiency of windings in each encapsulation by increasing the convection heat dissipation area of epoxy resin and air, and takes away heat by reasonably designing an air circulation path and fully utilizing air. The heat dissipation area and the air utilization rate are increased, the heat dissipation efficiency of the winding is improved, the strength of the winding can be increased by changing the shape of the encapsulation of the winding, the heat dissipation area is increased, and the heat dissipation performance of the transformer is improved. The change is helpful to inhibit the temperature rise of the winding, effectively reduce the working temperature of the transformer, and improve the reliability and service life of the equipment.

2. The high-voltage winding epoxy encapsulating cylinder and the low-voltage winding epoxy encapsulating cylinder are respectively provided with the first ventilation grooves and the second ventilation grooves on the inner wall and the outer wall, the shape improves the heat dissipation area of the high-voltage winding epoxy encapsulating cylinder and the low-voltage winding epoxy encapsulating cylinder, the cooling effect is better, meanwhile, a plurality of through ventilation channels are arranged in the high-voltage winding epoxy encapsulating cylinder at intervals, cooling air can be introduced into the high-voltage winding epoxy encapsulating cylinder, the cooling effect is better, and the use amount of encapsulating materials is reduced.

3. According to the invention, the insulating wind shield is designed to form a sealed space, so that the air utilization rate is improved, and the temperature rise of the iron core and the winding is further reduced. The measures are helpful for optimizing the heat dissipation structure and improving the working efficiency and stability of the transformer.

4. The wind shield at the upper end of the insulating cylinder changes the operation aiming at the fluid field of air in the box body, when wind flows through the upper end of the winding encapsulation cylinder, the flowing speed of the wind is improved, the heat dissipation efficiency is enhanced, and the problem that the winding encapsulation cylinder is locally overheated is practically solved. The improvement measure can optimize the air flow state in the box body, so that more heat can be timely evacuated along with the wind with accelerated flow speed, the phenomenon that local heat of the winding encapsulation cylinder is gathered to cause overheating is prevented, and strong support is provided for the stable operation of equipment. The heat exchange process in the box body is more efficient, heat generated by the winding encapsulation cylinder can be taken away more quickly by wind, the problems that the equipment is free from faults or performance is reduced due to local overheating in the operation process are solved, and the stability and reliability of the whole system are ensured.

Drawings

Fig. 1 is a schematic structural diagram of a ventilation cooling structure for high-low voltage windings of a box-type transformer according to an embodiment of the present invention;

FIG. 2 is an exploded view of a ventilation cooling structure for high and low voltage windings of a box-type transformer according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a high voltage winding epoxy potting barrel of an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a high voltage winding epoxy potting barrel of an embodiment of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 3 according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a three-phase cartridge of a transformer in accordance with an embodiment of the present invention;

FIG. 7 is an assembly view of a three-phase cylinder and an upper end pressing block of a transformer according to an embodiment of the present invention;

FIG. 8 is an assembly view of a three-phase cylinder of a transformer and a lower end press block according to an embodiment of the present invention;

FIG. 9 is an assembly view of a three-phase cylinder of a transformer with an upper end press block and a lower end press block according to an embodiment of the present invention;

FIG. 10 is a schematic view of an upper end pressing block according to an embodiment of the present invention;

FIG. 11 is an assembly view of an upper end press block according to an embodiment of the present invention;

fig. 12 is a schematic view of an installation structure of a clip on an iron core according to an embodiment of the present invention;

Fig. 13 is a partial enlarged view of an upper clip of the core according to an embodiment of the present invention;

fig. 14 is a schematic structural view of an insulating wind shield of a ventilation cooling structure for high and low voltage windings of a box-type transformer according to an embodiment of the present invention;

FIG. 15 is a schematic view of an installation of an insulating wind deflector according to an embodiment of the present invention;

FIG. 16 is a cross-sectional view of an upper end wind deflector of an insulating cylinder according to an embodiment of the present invention;

fig. 17 is a schematic diagram of a cooling air path of a ventilation cooling structure for high and low voltage windings of a box-type transformer according to an embodiment of the present invention.

In the drawings, the list of components represented by the various numbers is as follows:

1. The high-voltage winding insulation device comprises an upper iron core clamping piece, a lower iron core clamping piece, a 3 upper part flow wind shield, a4 lower part wind shield, a5 insulating wind shield, a 6 upper end pressing block, a 7 lower end pressing block, an 8, a rib plate, a 9 iron core, a 10 high-voltage winding outer insulation cylinder, an 11 high-voltage winding insulation cylinder, a 12 low-voltage winding epoxy resin encapsulation cylinder, a 13 high-voltage winding epoxy resin encapsulation cylinder, a 14, a wind shield fixing piece, a 15, a nut, a 16, a gasket, a 17, a first connecting bolt, a 18, a second connecting bolt, a19, a transformer box body, a 20, an upper air outlet, a 21, a lower air outlet, a 22, an axial radiating air channel A, a23, an axial radiating air channel B, a 24, an axial radiating air channel C, a 25, an air channel, a 26, a second air vent, a 28, a first ventilating slot, a 29, air, a 30, a power distribution cabinet baffle, a 31, a high-low-voltage distribution cabinet, a 32 and an upper end wind shield of the insulation cylinder.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 16, a ventilation cooling structure for high and low voltage windings of a box-type transformer comprises a transformer box 19, a transformer three-phase cylinder, an iron core upper clamping piece 1, an iron core lower clamping piece 2 and a lower wind shield 4,

The three-phase barrels of the transformers are arranged in a plurality, and each three-phase barrel of the transformers is arranged on the iron core in a surrounding mode;

wherein the iron core 9 is arranged in the transformer box 19 through the iron core upper clamping piece 1 and the iron core lower clamping piece 2;

The transformer box 19 is also provided with a power distribution cabinet baffle 30, and the transformer box 19 separates a three-phase cylinder of the transformer from a high-voltage power distribution cabinet and a low-voltage power distribution cabinet in the transformer box 19 through the power distribution cabinet baffle 30;

The lower wind shield 4 is fixedly arranged in the transformer box 19, the lower wind shield 4 divides the transformer box 19 into an upper air outlet part and a lower air supply part, the lower wind shield 4 is sleeved on the outer wall of the three-phase transformer cylinder, the upper air supply part of the transformer box 19 is provided with a plurality of air outlets, and a plurality of ventilation channels are axially formed in the high-voltage winding epoxy encapsulation cylinder of the three-phase transformer cylinder. The transformer high-low voltage winding embedment cooling structure of this design has designed special wind channel and exhaust system, can make the air flow through the radiating surface fast through forced convection to improve radiating efficiency. Compared with a natural air-cooled transformer, the temperature of the transformer can be effectively reduced in a shorter time, and meanwhile, the design is suitable for various environmental conditions, and the heat dissipation effect of the transformer can be kept stable especially in high-temperature or high-altitude areas. The fan system not only depends on natural wind, but also increases the adaptability to environmental conditions through the fan system, and in addition, the design adjusts the heat dissipation efficiency by controlling the running speed of the fan, thereby realizing more flexible temperature control. This design provides better response and regulation capabilities when dealing with transformer operating requirements under different loads and environmental conditions.

The upper clamping piece 1 of the iron core of the embodiment of the invention comprises two fixing plates and a first connecting bolt 17, wherein the two fixing plates are arranged in parallel, and two ends of the fixing plates are fixedly arranged in the transformer box body 19; the two fixing plates are connected through a first connecting bolt 17, and when the iron core is installed, the two fixing plates of the upper iron core clamping piece 1 are fixed with the upper part of the iron core 9 through the first connecting bolt 17;

The lower iron core clamping piece 2 has the same structure as the upper iron core clamping piece 1, the lower iron core clamping piece 2 comprises two fixing plates and a second connecting bolt 18, the two fixing plates are arranged in parallel, two ends of each fixing plate are fixedly arranged in a transformer box 19, the two fixing plates are connected through the second connecting bolt 18, and when the iron core 9 is installed, the two fixing plates of the lower iron core clamping piece 2 are fixed with the lower portion of the iron core 9 through the second connecting bolt 18.

The lower wind shield 4 of the embodiment of the invention is provided with a hole matched with a three-phase cylinder of a transformer, wherein the three-phase cylinder of the transformer is respectively a low-voltage winding epoxy encapsulation cylinder 12, a low-voltage winding insulation cylinder, a high-voltage winding insulation cylinder 11, a high-voltage winding epoxy encapsulation cylinder 13 and a high-voltage outer insulation cylinder 10 from inside to outside, and the lower part of the high-voltage outer insulation cylinder 10 is fixedly connected with the inner wall of the hole of the lower wind shield 4; the high-voltage winding epoxy potting barrel 13 is internally provided with a plurality of through ventilation channels 25 at intervals, wherein the ventilation channels 25 are arranged along the height direction of the high-voltage winding epoxy potting barrel 13, the ventilation channels 25 are provided with three layers along the radial direction of the high-voltage winding epoxy potting barrel 13, the cross section of the ventilation channels 25 is a saw-tooth cross section, the saw-tooth cross section comprises wave crests and wave troughs alternately arranged along the circumferential direction of the ventilation channels 25, first bulges are arranged on the outer wall and the inner wall of the high-voltage winding epoxy potting barrel 13 at intervals along the circumferential direction, the first bulges are arranged along the height direction of the high-voltage winding epoxy potting barrel 13, each two adjacent first bulges form a first ventilation groove 28, the inner wall and the outer side wall of the low-voltage winding epoxy potting barrel 12 are respectively provided with a plurality of second bulges along the circumferential direction, each two adjacent second bulges form a second ventilation groove 26, and the cross section of each second bulge and each first bulge is rectangular, saw-tooth, trapezoid or parabola parabolic shape. The high-voltage winding epoxy encapsulating cylinder 13 and the low-voltage winding epoxy encapsulating cylinder 12 are respectively provided with the first ventilation grooves 28 and the second ventilation grooves 26 on the inner wall and the outer wall, the shape improves the heat dissipation area of the high-voltage winding epoxy encapsulating cylinder 13 and the low-voltage winding epoxy encapsulating cylinder 12, the cooling effect is better, meanwhile, a plurality of through ventilation channels are arranged in the high-voltage winding epoxy encapsulating cylinder 13 at intervals, cooling air can be introduced into the high-voltage winding epoxy encapsulating cylinder 13, the cooling effect is better, the usage amount of encapsulating materials is reduced, and meanwhile, the saw-tooth-shaped section of the ventilation channels and the ventilation channels 25 are provided with three layers along the radial direction of the high-voltage winding epoxy encapsulating cylinder 13, and the cooling effect is further enhanced.

The ventilation cooling structure for the high-low voltage winding of the box-type transformer comprises an upper end pressing block 6 and a lower end pressing block 7, wherein a plurality of upper end pressing blocks 6 are arranged, each upper end pressing block 6 comprises a pressing block body and rib plates 8, clamping grooves are formed in the bottoms of the pressing block bodies, the pressing block bodies are in clamping fit with the tops of low-voltage winding insulating cylinders or high-voltage winding insulating cylinders 11 through the clamping grooves, the rib plates 8 are fixedly arranged on the pressing block bodies through bolts, and the rib plates 8 are fixedly connected with the fixing plates of the upper clamping pieces 1 of the iron core;

the lower end pressing blocks 7 are provided with a plurality of pressing blocks, each lower end pressing block 7 comprises a pressing block body and a rib plate 8, clamping grooves are formed in the tops of the pressing block bodies, the pressing block bodies are matched with the tops of the low-voltage winding insulating cylinders or the high-voltage winding insulating cylinders 11 in a clamping mode through the clamping grooves, the rib plates 8 are fixedly arranged on the bodies through bolts, and the rib plates 8 are fixedly connected with the fixing plates of the iron core lower clamping pieces 2. The strength of the three-phase cylinder of the whole transformer can be improved through the upper end pressing block 6 and the lower end pressing block 7, and the structural improvement measures are helpful for reducing the vibration or deformation problems possibly encountered by the transformer in the use process, and the durability and the safety of the equipment are enhanced.

The bottoms of the low-voltage winding insulating cylinder and the high-voltage winding insulating cylinder 11 are provided with insulating wind shields 5, wherein the top of a lower end pressing block 7 is provided with clamping grooves matched with the insulating wind shields 5, and the lower end pressing block 7 is matched with the insulating wind shields 5 in a clamping way. According to the embodiment, through the design of the insulating wind shield 5, the upper part flow wind shield 3 and the lower part wind shield 4, a sealed space and a directional radial cooling air flow path are formed, the characteristics of messy, slow and mutual interference of air flow directions in the traditional box type transformer box 19 are avoided, the utilization rate of air 29 is improved, and the reduction effect is better.

The tops of the low-voltage winding insulating cylinder and the high-voltage winding insulating cylinder 11 are provided with insulating cylinder upper-end wind shields 32, wherein the bottom of an upper-end pressing block 6 is provided with clamping grooves matched with the insulating cylinder upper-end wind shields 32, and the upper-end pressing block 6 is matched with the insulating cylinder upper-end wind shields 32 in a clamping mode. The difficult problem of overheat of the upper end of the winding encapsulation cylinder is effectively solved, and the speed of air flowing through the upper end of the winding encapsulation cylinder can be increased, so that the heat dissipation efficiency is enhanced. When the air flow speed is increased, the heat generated at the upper end of the winding encapsulation cylinder can be more quickly taken away, and the floating objects can be more quickly taken away like turbulent water flow. Therefore, the overheat condition of the upper end can be obviously improved, the stable operation of the equipment is ensured, the fault risk caused by overheat is reduced, and the service life of the equipment is prolonged.

The ventilation cooling structure of the high-low voltage winding of the box-type transformer further comprises an upper part flow wind shield, wherein one end of the upper part flow wind shield is fixedly arranged in the transformer box 19 through a wind shield fixing piece 14, the other end of the upper part flow wind shield is in butt joint with the side wall of a fixing plate of an upper clamping piece of an iron core, the upper part flow wind shield is positioned above the lower part wind shield, a plurality of air outlets comprise an upper air outlet 20 and a lower air outlet 21, the upper air outlet 20 and the lower air outlet 21 are symmetrically arranged above and below the upper part flow wind shield 3, and the bottom of the lower air outlet 21 is higher than the top of a three-phase barrel of the transformer.

When the transformer box 19 is cooled, the path of cooling air is that the lower air supply part, the ventilation channel in the high-voltage winding epoxy encapsulation cylinder 12 and the axial hole between the three-phase cylinder of the transformer and the iron core 9, the upper air outlet 20 of the upper part flow wind shield 3 and the lower air outlet 21 of the upper part flow wind shield 3. The design considers the characteristic of low self heat dissipation efficiency of the wind power transformer, and adopts the measure of increasing the exhaust fan. The measure can improve the wind speed and the air utilization rate, effectively reduce the temperature rise of the iron core 9 and the winding, and improve the overall heat dissipation effect. Meanwhile, by designing the insulating wind shield 5, a sealing space is formed, the air utilization rate is improved, and the temperature rise of the iron core 9 and the winding is further reduced. In addition, the upper part flow wind shield 3, the lower part wind shield 4 and the insulating wind shield 5 are also introduced, so that the defects of mess, slowness and mutual interference of air flow in the traditional box type transformer box body 19 are avoided, the flow direction of an air field in the transformer box body 19 is improved by the design, the air 29 forms a closed loop, the utilization rate of the air 29 is improved, and the temperature is continuously and effectively reduced.

Specifically, as shown in fig. 16-17, the lower wind shield 4 is provided with three holes matched with the three-phase cylinder of the transformer, the three-phase cylinder of the transformer is fixedly connected with the inner wall of the holes of the lower wind shield 4, and three heat dissipation wind paths are formed by matching the upper flow wind shield 3 and the insulating wind shield 5, and the ventilation cooling wind path of each heat dissipation wind path is a lower air supply part, namely a ventilation channel in the high-voltage winding epoxy encapsulation cylinder 12 and an axial hole between the three-phase cylinder of the transformer and the iron core 9, namely an upper air outlet 20 of the upper flow wind shield 3 and a lower air outlet 21 of the upper flow wind shield 3.

The wind shield 32 at the upper end of the insulating cylinder is internally provided with four layers of circular grooves and four layers of high-voltage low-voltage main insulating cylinders 11 for fixing, the wind shield 32 at the upper end of the insulating cylinder is assembled with four groups of upper end pressing blocks 6, and the inner side and the outer side of the wind shield 32 at the upper end of the insulating cylinder are respectively provided with a trapezoid wind shield structure. The wind shield 32 at the upper end of the specific insulating cylinder can effectively prevent wind at the air inlet from flowing out of the box body from gaps among the four layers of main insulators 11, so that the utilization rate of wind in the box body is improved. The two sides of the wind shield 32 at the upper end of the insulating cylinder are respectively provided with a trapezoid wind shielding structure, the inner side of the trapezoid wind shielding structure is 30mm wide, and the gap between the main insulating cylinder 11 and the upper end part of the outer side of the low-voltage winding epoxy resin encapsulation cylinder 12 is reduced. When wind passes through the upper end part, the flow velocity of the wind can be increased, and the heat dissipation effect of the part is improved. The fluid area of the air in the transformer box 19 is changed, and the flow velocity of wind is increased in the process that the wind flows through the upper end of the winding encapsulation cylinder, so that the heat dissipation efficiency is improved, and the problem that the winding encapsulation cylinder is locally overheated is effectively solved. Such an improvement can optimize the air flow condition in the transformer box 19, so that more heat can be timely taken away along with the wind with an accelerated flow rate, the overheat condition caused by the local heat accumulation of the winding potting cylinder is avoided, and a powerful guarantee is provided for the stable operation of the equipment.

While the application has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application, and it is intended that the application is not limited to the specific embodiments disclosed.

Claims (8)

1. The ventilation cooling structure of the high-low voltage winding of the box-type transformer is characterized by comprising a transformer box body (19), a transformer three-phase cylinder, an iron core (9), an iron core upper clamping piece (1), an iron core lower clamping piece (2) and a lower wind shield (4);

the transformer three-phase barrels are arranged in plurality, and each transformer three-phase barrel is arranged on the iron core (9) in a surrounding mode;

The iron core (9) is arranged in the transformer box body (19) through the iron core upper clamping piece (1) and the iron core lower clamping piece (2);

The transformer box body (19) is also provided with a power distribution cabinet baffle (30), and the transformer box body (19) separates a transformer three-phase cylinder from a high-voltage power distribution cabinet in the transformer box body (19) through the power distribution cabinet baffle (30);

The lower wind shield (4) is fixedly arranged in the transformer box body (19), the lower wind shield (4) divides the transformer box body (19) into an upper air outlet part and a lower air supply part, and the lower wind shield (4) is sleeved on the outer wall of the three-phase cylinder of the transformer;

An upper air outlet part of the transformer box body (19) is provided with an upper row of air outlets and a lower row of air outlets;

a plurality of ventilation channels are axially formed in the high-voltage winding epoxy potting cylinder (13) of the transformer three-phase cylinder.

2. The ventilation cooling structure of the high-low voltage winding of the box-type transformer according to claim 1, wherein the upper iron core clamping piece (1) comprises two fixing plates and a first connecting bolt (17), the two fixing plates are arranged in parallel, two ends of the fixing plates are fixedly arranged in a transformer box body (19), the two fixing plates are connected through the first connecting bolt (17), and when the iron core is installed, the two fixing plates of the upper iron core clamping piece (1) are fixed with the upper part of the iron core (9) through the first connecting bolt (17);

The iron core lower clamping piece (2) is identical to the iron core upper clamping piece (1) in structure, the iron core lower clamping piece (2) comprises two fixing plates and a second connecting bolt (18), the two fixing plates are arranged in parallel, two ends of each fixing plate are fixedly arranged in a transformer box body (19), the two fixing plates are connected through the second connecting bolt (18), and when the iron core (9) is installed, the two fixing plates of the iron core lower clamping piece (2) are fixed with the lower portion of the iron core (9) through the second connecting bolt (18).

3. The ventilation cooling structure for the high-low voltage winding of the box-type transformer is characterized in that the lower wind shield (4) is provided with a hole matched with a three-phase cylinder of the transformer, the three-phase cylinder of the transformer is respectively provided with a low-voltage winding epoxy encapsulation cylinder (12), a low-voltage winding insulation cylinder, a high-voltage winding insulation cylinder (11) and a high-voltage winding epoxy encapsulation cylinder (13) and a high-voltage outer insulation cylinder (10) from inside to outside, the lower part of the high-voltage outer insulation cylinder (10) is fixedly connected with the inner wall of the hole of the lower wind shield (4), a plurality of through ventilation channels (25) are arranged in the high-voltage winding epoxy encapsulation cylinder (13) at intervals, the outer wall and the inner wall of the high-voltage winding epoxy encapsulation cylinder (13) are respectively provided with first bulges along the circumferential direction, each first bulge is arranged along the height direction of the high-voltage winding epoxy encapsulation cylinder (13), each two adjacent first bulges form a first bulge 28, the inner wall of the high-voltage winding epoxy encapsulation cylinder (12) is provided with a plurality of through ventilation channels (25) at intervals along the height direction of the high-voltage winding epoxy encapsulation cylinder (13), and each second bulge is provided with a plurality of bulges along the circumferential direction, and each second bulge is provided with a second bulge (12) with a trapezoid-shaped bulge along the height direction, and each second bulge is provided with a second bulge with a trapezoid shape along the height direction.

4. The ventilation cooling structure for the high-low voltage winding of the box-type transformer according to claim 3, which is characterized by further comprising an upper end pressing block (6) and a lower end pressing block (7), wherein the upper end pressing block (6) is provided with a plurality of upper end pressing blocks, each upper end pressing block (6) comprises a pressing block body and a rib plate (8), a clamping groove is formed in the bottom of the pressing block body, the pressing block body is matched with the top of the low-voltage winding insulating cylinder or the high-voltage winding insulating cylinder (11) in a clamping manner through the clamping groove, the rib plates (8) are fixedly arranged on the pressing block body through bolts, and the rib plates (8) are fixedly connected with a fixing plate of an upper iron core clamping piece (1);

The lower end pressing blocks (7) are provided with a plurality of pressing blocks, each lower end pressing block (7) comprises a pressing block body and a rib plate (8), clamping grooves are formed in the tops of the pressing block bodies, the pressing block bodies are matched with the tops of the low-voltage winding insulating cylinders or the high-voltage winding insulating cylinders (11) in a clamping mode through the clamping grooves, the rib plates (8) are fixedly arranged on the pressing block bodies through bolts, and the rib plates (8) are fixedly connected with the fixing plates of the iron core lower clamping pieces (2).

5. The ventilation cooling structure for the high-low voltage windings of the box-type transformer according to claim 4 is characterized in that insulating wind shields (5) are arranged at the bottoms of the low-voltage winding insulating cylinder and the high-voltage winding insulating cylinder (11), clamping grooves matched with the insulating wind shields (5) are formed in the tops of the lower end pressing blocks (7), and the lower end pressing blocks (7) are matched with the insulating wind shields (5) in a clamping mode.

6. The ventilation cooling structure for the high-low voltage winding of the box-type transformer according to claim 4, further comprising an upper part flow wind shield (3), wherein one end of the upper part flow wind shield (3) is fixedly arranged in the transformer box body (19), the other end of the upper part flow wind shield (3) is abutted to the side wall of the fixed plate of the upper clamping piece (1) of the iron core, the upper part flow wind shield (3) is positioned above the lower part wind shield 4, a plurality of air outlets comprise an upper air outlet (20) and a lower air outlet (21), the upper air outlet (20) and the lower air outlet (21) are symmetrically arranged above and below the upper part flow wind shield (3), and the bottom height of the lower air outlet (21) is higher than the top height of the three-phase barrel of the transformer.

7. The ventilation cooling structure for high-low voltage windings of box-type transformer according to claim 4, wherein the path of cooling air is that the lower air supply part-between the inner side of the outer insulating cylinder (10) of the high-voltage winding and the epoxy resin encapsulation cylinder (13) of the high-voltage winding, between the inner side of the epoxy resin encapsulation cylinder (13) of the high-voltage winding and the epoxy resin encapsulation cylinder (12) of the low-voltage winding and between the epoxy resin encapsulation cylinder (12) of the low-voltage winding and the outer surface of the iron core (9) -the diversion effect of the upper diversion wind shield (3) is discharged out of the box-type transformer (19) through the lower air outlet (21) and the upper air outlet (21) respectively.

8. The ventilation cooling structure for the high-low voltage winding of the box-type transformer according to claim 4, further comprising an upper end wind shield (32) of the insulating cylinder, wherein four layers of round grooves are formed in the upper end wind shield (32) of the insulating cylinder and are fixed with four layers of high-voltage low-voltage main insulating cylinders (11), the upper end wind shield (32) of the insulating cylinder is assembled with four groups of upper end pressing blocks (6), and a trapezoid wind shield structure is arranged on the inner side and the outer side of the upper end wind shield (32) of the insulating cylinder respectively.