CN115023775A - A new type of dry-type transformer - Google Patents

Abstract

The invention discloses a novel dry-type transformer, which comprises a transformer body and a shell; the transformer body comprises a coil; the shell is provided with a longitudinal ventilation channel, the transformer body is positioned in the ventilation channel, the coil is provided with a longitudinal coil air channel, the shell is provided with an air inlet and an air outlet, the air inlet and the air outlet are both communicated with the ventilation channel, the air inlet is positioned below the transformer body, the air outlet is positioned above the transformer body, and the working temperature of the lower part of the coil is higher than that of the upper part of the coil; utilize the chimney effect, form the air current at the ventiduct, make the air current pass through the fore-and-aft coil wind channel in the coil, can take away the heat that the coil produced better, cool down the coil fast, promoted transformer heat-sinking capability.

Description

A new type of dry-type transformer

technical field

The invention relates to the field of transformers, in particular to a novel dry-type transformer.

Background technique

The transformer will generate a lot of heat during the working process. When the heat cannot be dissipated in time, the temperature in the transformer casing will rise. When the temperature of the transformer is too high, the internal parts of the transformer will be damaged.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a novel dry-type transformer.

The technical scheme adopted by the present invention to solve its problem is:

A new type of dry-type transformer, comprising:

a transformer body, the transformer body including a coil;

a casing, the casing is provided with a longitudinal ventilation duct, the transformer body is located in the ventilation duct, the casing is provided with an air inlet and an air outlet, and the air inlet and the air outlet are The air ducts are connected, the air inlet is located below the transformer body, and the air outlet is located above the transformer body to form a chimney effect; the coil is provided with a longitudinal coil air duct; The operating temperature of the lower part is higher than that of the upper part of the coil to enhance the chimney effect.

Further, the housing is provided with an air outlet, and the ventilation duct includes an air outlet pipe arranged in the air outlet portion; the end of the air outlet pipe is the air outlet, and the air outlet pipe gradually shrinks toward the air outlet. narrow.

Further, a partition is provided between the casing and the transformer body, and a longitudinal first ventilation gap is formed between the partition and the transformer body.

Further, the ventilation duct includes an air inlet duct, and the air inlet duct is located at the lower part of the housing; the head end of the air inlet duct is the air inlet.

Further, there are a plurality of the air inlet ducts; the plurality of the air inlet ducts are arranged around the transformer body, and the air outlet directions of the plurality of the air inlet ducts all face the transformer body.

Further, the outer surface of the coil is provided with a transverse annular air channel.

Further, the annular air passage has multiple turns, the multiple annular air passages are arranged at intervals along the coil from bottom to top, and the width of the annular air passage increases gradually from bottom to top.

Further, the number of turns of the coil gradually decreases from bottom to top, and the conductor cross section of the coil gradually increases from bottom to top.

Further, the coil includes a high-voltage coil and a low-voltage coil, the high-voltage coil surrounds the outside of the low-voltage coil, and the coil air channel includes a first coil air channel formed between the high-voltage coil and the low-voltage coil.

Further, the coil air duct further includes a longitudinal second coil air duct and a longitudinal third coil air duct; the second coil air duct is formed inside the low-voltage coil, and the third coil air duct is located at the The inside of the high-voltage coil is formed.

The above scheme has at least the following beneficial effects: the transformer body is arranged in the longitudinal ventilation duct, the air inlet is arranged below the transformer body, and the air outlet is arranged above the transformer body; The surrounding air is heated; using the chimney effect, the hot air in the ventilation duct rises, forming an air flow in the ventilation duct, so that the cold air enters the ventilation duct from the lower air inlet and leaves the ventilation duct from the upper air outlet; in addition, the air flows through The longitudinal coil air duct in the coil can better take away the heat generated by the coil and quickly cool down the coil; the air flow formed by the chimney effect takes away the heat generated by the work of the transformer body, cools the transformer body and dissipates heat, making the transformer The body of the device can be continuously maintained in the normal working temperature range, which improves the heat dissipation capacity of the transformer; the working temperature of the lower part of the coil is higher than that of the upper part of the coil, so as to enhance the chimney effect and improve the heat dissipation capacity of the transformer.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples.

1 is an external structure diagram of a novel dry-type transformer according to an embodiment of the present invention;

2 is an internal structure diagram of a novel dry-type transformer according to an embodiment of the present invention;

Fig. 3 is the installation schematic diagram of the transformer body and the casing;

Figure 4 is a structural diagram of a transformer body;

Fig. 5 is a connection diagram of a coil and a pressing block.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

1 and 2, an embodiment of the present invention provides a novel dry-type transformer.

The novel dry-type transformer includes a transformer body 300 and a casing 100 .

The transformer body 300 includes a coil 310 and an iron core 320 . The housing 100 is provided with a longitudinal ventilation channel 210, the transformer body 300 is located in the ventilation channel 210, the coil 310 is provided with a longitudinal coil air channel 330, the housing 100 is provided with an air inlet 201 and an air outlet 202, and the air inlet 201 and the outlet The air vents 202 are all communicated with the ventilation duct 210 , the air inlet 201 is located below the transformer body 300 , and the air outlet 202 is located above the transformer body 300 .

It should be noted that the arrows in FIG. 2 indicate the direction of the air flow.

In this embodiment, the transformer body 300 is arranged in the longitudinal ventilation duct 210, the air inlet 201 is arranged below the transformer body 300, and the air outlet 202 is arranged above the transformer body 300; when the transformer body 300 is working , generate heat, and heat the surrounding air; using the chimney effect, the hot air in the ventilation duct 210 rises, forming an air flow in the ventilation duct 210, so that the cold air enters the ventilation duct 210 from the air inlet 201 below, and flows from above. The air outlet 202 of the coil 310 leaves the air duct 210; in addition, the air flow passes through the longitudinal coil air duct 330 in the coil 310, which can better take away the heat generated by the coil 310 and quickly cool the coil 310; The air flow formed by the chimney effect cools the transformer The heat generated by the operation of the body 300 is taken away, and the temperature of the transformer body 300 is cooled and dissipated, so that the transformer body 300 can continue to maintain a normal working temperature range, and the heat dissipation capacity of the transformer is improved; The working temperature of the upper part is high to enhance the chimney effect and improve the heat dissipation capacity of the transformer.

During the operation of the transformer body 300 , the main heat-generating part is the coil 310 . The coil air duct 330 is arranged in the coil 310 , so that the air flow in the air duct 210 can pass through the interior of the coil 310 , and the heat of the coil 310 can be quickly carried away. In addition, the direction of the coil air duct 330 is longitudinal, which is the same as the direction of the air duct 210 and the same as the flow direction of the air flow, so that the air flow can pass through the coil air duct 330 naturally, without being blocked to reduce the flow rate, and the air flow can be smoothly carried The heat of the coil 310 is dissipated, which is beneficial to cooling the coil 310 and dissipating heat.

It should be noted that the longitudinal direction is not limited to be perpendicular to the horizontal plane at 90 degrees, as long as the extension direction of the ventilation duct 210 and the coil duct 330 is upward and has a vertical slope, even if the extension direction of the ventilation duct 210 and the coil duct 330 is perpendicular to the vertical line A certain inclination angle also belongs to the vertical category.

The chimney effect is a manifestation of the form of heat exchange; the chimney effect refers to the phenomenon that the air rises or falls along a space with a vertical slope, resulting in enhanced air convection. In buildings and structures with shared atriums, vertical ventilation ducts, stairwells, etc. with chimney-like features—that is, with unobstructed circulation space from the bottom to the top, the air moves quickly along the passage due to the difference in density. The phenomenon of diffusion or discharge from a building is known as the chimney effect.

The chimney effect is the natural ventilation caused by thermal pressure. In the natural ventilation under the action of hot pressure, the difference in air density is generated due to the temperature difference between the air inside and outside the object, so a pressure difference is formed, which tends to flow indoor and outdoor air. The air with high indoor temperature rises due to its small specific gravity and is discharged from the upper air outlet of the object. At this time, a negative pressure area will be formed in the original place of the low-density air, so the fresh air with a relatively low outdoor temperature and a large specific gravity will be discharged from the bottom of the building. Inhaled, the indoor and outdoor air flows continuously.

The strength of the chimney effect is related to the height difference between the air inlet and outlet, the temperature difference between the air inlet and outlet, the temperature difference between indoor and outdoor, and the degree of indoor and outdoor air circulation. The greater the temperature difference between indoor and outdoor and the height difference between the air inlet and outlet, the more obvious the effect of thermal pressure.

In some embodiments of the present invention, the housing 100 includes a main accommodating part 120 and an air outlet 110 , and the main accommodating part 120 is a part for accommodating the transformer body 300 . The main accommodating part 120 is a hexagonal prism, which is close to the shape of the transformer body 300 , which can help to reduce the cost of production materials and the cost of transportation space.

In addition, the casing 100 can play the role of windproof, rainproof, dustproof and anti-external impact, and has a good protection function for the inner transformer body 300 .

In some embodiments of the present invention, the ventilation duct 210 includes an air outlet duct 212 disposed in the air outlet portion 110 ; Due to the longitudinal arrangement of the air outlet duct 212 , the hot air exiting from the air outlet 202 is cooled and the density increases. The use of the air outlet duct 212 that is gradually narrowed toward the air outlet 202 can gradually increase the speed of the air flow along the air outlet duct 212, increase the flow velocity of the hot air when it leaves the air outlet 202, prevent the cold air from flowing back into the air outlet 202, and enhance heat dissipation. Effect.

The air outlet portion 110 is in the shape of a pyramid, and the cross section of the air outlet portion 110 gradually decreases from bottom to top. This can reduce the overall center of gravity of the transformer, improve the structural stability, and stand more stable.

By arranging the air outlet 110, the air outlet 202 at the end of the air outlet 110 is at the highest position of the entire transformer, which is beneficial to increase the height of the air outlet 202 and increase the height difference between the air outlet 202 and the air inlet 201. Increasing the height difference between the air outlet 202 and the air inlet 201 can increase the strength of the chimney effect, the hot pressing effect is more obvious, and the air flow is stronger, which is beneficial to improve the heat dissipation effect of the transformer.

In some embodiments of the present invention, a partition 400 is disposed between the casing 100 and the transformer body 300 , and a longitudinal first ventilation gap 213 is formed between the partition 400 and the transformer body 300 . The space between the casing 100 and the transformer body 300 is filled by the partition plate 400, so that the cold air coming in from the air inlet 201 can be concentrated to the position of the transformer body 300; meanwhile, a longitudinal direction is formed between the partition plate 400 and the transformer body 300 The first ventilation gap 213 . The width of the first ventilation gap 213 is usually designed to be relatively narrow, which is beneficial to increase the flow velocity of the air flow in the ventilation pipe and improve the heat dissipation effect. The first ventilation gap 213 is located at the outer side of the transformer body 300 , and the air flow circulating in the first ventilation gap 213 can take away the heat from the outer side of the transformer body 300 . Of course, the width of the first ventilation gap 213 can be determined according to the actual production requirements and specific structural parameters of the transformer.

In addition, the separator 400 is made of insulating material and has an insulating effect.

In some embodiments of the present invention, the ventilation duct 210 includes an air inlet duct 211 , and the air inlet duct 211 is located at the lower part of the housing 100 ; the head end of the air inlet duct 211 is the air inlet 201 . The air inlet 201 is arranged on the outer side of the casing, and the air inlet duct 211 extends toward the inside of the casing 100 . The air inlet duct 211 is of a circular duct structure, so that the cold air entering from the air inlet 201 is more concentrated, which can effectively increase the air inlet flow rate and improve the cooling efficiency of the cold air.

In some embodiments of the present invention, there are multiple air inlet ducts 211 ; the multiple air inlet ducts 211 are arranged around the transformer body 300 , and the air outlet directions of the multiple air inlet ducts 211 are all directed toward the transformer body 300 , so that cold air It can be concentrated to the position of the transformer body 300 , which is beneficial to the heat dissipation of the transformer body 300 .

Specifically, the main accommodating portion 120 of the housing 100 is in the shape of a hexagonal prism, and the lower portion is in the shape of a hexagonal pyramid. The numbers of the air inlets 201 provided on the six surfaces of the lower part of the hexagonal pyramid shape are 2, 3, 1, 3, 1, and 3, respectively. Correspondingly, each air inlet 201 is connected to an air inlet duct 211 , and a total of 13 air inlets 201 and 13 air inlet ducts 211 are provided.

In some embodiments of the present invention, the partition plate 400 is provided with a perforation 410 adapted to the air inlet duct 211 , and the air inlet duct 211 is inserted into the through hole 410 ; The walls are attached to each other, which can better fix the air inlet duct 211 .

In some embodiments of the present invention, the transformer body 300 is a dry-type body, which is different from an oil-immersed body. The transformer body 300 includes an iron core 320 and a coil 310. The iron core 320 adopts a three-dimensional wound iron core 320 structure, which is wound and processed by electrical steel strip or amorphous strip. Three rectangular iron frames. The three rectangular iron core frames are placed vertically, and the two adjacent rectangular iron core frames are spliced together, and the vertical core columns of the two adjacent rectangular iron core frames are in contact with each other; thus, a three-dimensional structure with an equilateral triangle in a top view direction is obtained. The coil 310 includes a-phase coil 310 , b-phase coil 310 and c-phase coil 310 , a total of three-phase coils 310 .

The housing 100 is provided with four low-voltage connection terminals 160, the four low-voltage connection terminals 160 are arranged horizontally on the same surface, and the four low-voltage connection terminals 160 are arranged at intervals; the four low-voltage connection terminals 160 are arranged on the same surface, which is convenient for wiring. The housing 100 is further provided with three high-voltage terminals 150, the three high-voltage terminals 150 are arranged horizontally on the other surface, and the three high-voltage terminals 150 are arranged at intervals; the three high-voltage terminals 150 are arranged on the same surface, which is convenient for wiring. The high-voltage connection terminal 150 and the low-voltage connection terminal 160 are respectively arranged on different surfaces, which is convenient for distinction and reduces the misconnection rate of wiring. Of course, in other embodiments, the numbers of the low-voltage connection terminals 160 and the high-voltage connection terminals 150 can also be set according to specific actual needs. The transformer is integrated into the distribution network by connecting cables through low voltage terminals 160 and high voltage terminals 150 .

Based on the principle of the chimney effect, the intensity of the chimney effect of the transformer is related to the thermal pressure difference between the air inlet 201 and the air outlet 202 . Increasing the thermal pressure difference between the air inlet 201 and the air outlet 202 can improve the strength of the chimney effect of the transformer, which is beneficial to heat dissipation. By increasing the difference between the temperature of the portion near the air inlet 201 and the temperature of the portion near the air outlet 202, the thermal pressure difference between the air inlet 201 and the air outlet 202 can be increased.

In some embodiments of the present invention, the outer surface of the coil 310 is provided with a transverse annular air channel 340 . The coil 310 includes a high-voltage coil 312 and a low-voltage coil 311. The high-voltage coil 312 surrounds the outside of the low-voltage coil 311; that is, specifically, the outer surface of the high-voltage coil 312 is provided with a transverse annular air passage 340. The annular air passage 340 can increase the air contact area for assisting heat dissipation.

In some embodiments of the present invention, the annular air passage 340 has multiple turns, the multiple annular annular air passages 340 are arranged at intervals along the coil 310 from bottom to top, and the width of the multiple annular annular air passage 340 gradually increases from bottom to top . Then, for the coil 310, the further away from the air outlet 202, the smaller the width of the annular air passage 340; Conducive to heat dissipation. In this way, the temperature of the lower part of the coil 310 can be higher than the temperature of the upper part of the coil 310, and the difference between the temperature of the part close to the air inlet 201 and the temperature of the part close to the air outlet 202 can be increased, which is beneficial to enhance the performance of the transformer. The strength of the chimney effect.

In some embodiments of the present invention, the number of turns of the coil 310 gradually decreases from bottom to top, and the conductor cross section of the coil 310 gradually increases from bottom to top.

Then for the coil 310, the part of the coil 310 that is farther from the air outlet 202 has more turns, and the part of the coil 310 that is closer to the air inlet 201 has fewer turns, and the part of the coil 310 with more turns generates more heat during operation, resulting in a higher temperature. high. In this way, the temperature of the lower part of the coil 310 can be higher than the temperature of the upper part of the coil 310, and the difference between the temperature of the part close to the air inlet 201 and the temperature of the part close to the air outlet 202 can be increased, which is beneficial to enhance the performance of the transformer. The strength of the chimney effect.

In addition, the conductor cross section of the coil 310 part farther from the air outlet 202 is smaller, the conductor cross section of the coil 310 part closer to the air inlet 201 is larger, and the coil 310 part with a smaller conductor cross section generates more heat during operation, resulting in higher temperature . In this way, the temperature of the lower part of the coil 310 can be higher than the temperature of the upper part of the coil 310, and the difference between the temperature of the part close to the air inlet 201 and the temperature of the part close to the air outlet 202 can be increased, which is beneficial to enhance the performance of the transformer. The strength of the chimney effect.

3 and 4 , in some embodiments of the present invention, the coil air duct 330 includes a first coil air duct 301 ; the first coil air duct 301 is formed between the high-voltage coil 312 and the low-voltage coil 311 . The air flow in the ventilation duct 210 can pass through the surfaces of the high-voltage coil 312 and the low-voltage coil 311, and the heat of the high-voltage coil 312 and the low-voltage coil 311 can be quickly taken away; The direction of the air flow 210 is the same as that of the air flow, so that the air flow can naturally pass through the coil air duct 330 to smoothly take away the heat of the coil 310 , which is beneficial to cooling the coil 310 and dissipating heat.

In some embodiments of the present invention, the coil air duct 330 includes a second coil air duct 302 and a third coil air duct 303 ; a longitudinal third coil air duct 303 is formed inside the high-voltage coil 312 ; The longitudinal second coil air duct 302 . The third coil air duct 303 enables the air in the ventilation duct 210 to pass through the interior of the high-voltage coil 312 , and the second coil air duct 302 enables the air in the ventilation duct 210 to pass through the interior of the low-voltage coil 311 , and the high-voltage coil 312 and the low-voltage coil 311 The heat is quickly taken away. In addition, the directions of the third coil air duct 303 and the second coil air duct 302 are both longitudinal, which are the same as the direction of the air duct 210 and the flow direction of the air flow, so that the air flow can naturally pass through the third coil air duct 303 and the air flow. The second coil air duct 302 smoothly takes away the heat of the coil 310 , which is beneficial to cooling the coil 310 and dissipating heat.

In some embodiments of the present invention, a hanger plate 130 is provided on the outer side of the casing 100 , and the transformer can be lifted easily through the hanger plate 130 . Specifically, the hanging plate 130 includes a horizontal bar, a vertical bar and a hook bar; the horizontal bar and the vertical bar are vertically arranged to form an inverted L shape; the hook bar is located at the end of the horizontal bar and protrudes in the up and down direction of the horizontal bar . The vertical bars are connected to the outer wall surface of the casing 100 .

In some embodiments of the present invention, a raised base 140 is provided below the casing 100, and the raised base 140 plays a load-bearing role. In addition, the raised base 140 keeps the casing 100 away from the ground and reduces the water vapor from the ground entering the casing. 100 , damage to the transformer body 300 in the casing 100 by the water vapor is avoided.

In addition, the raised base 140 can keep the lower part of the casing 100 and the lower part of the transformer body 300 located in the lower part of the casing 100 away from the ground. Since the ground temperature is generally low, keeping the lower part of the transformer body 300 away from the ground can reduce the effect of the ground on the temperature of the lower part of the transformer body 300 .

Specifically, the elevating base 140 includes two leg bars arranged in parallel, and a plurality of reinforcing bars are connected between the two leg bars. Specifically, the number of the reinforcing bars is six. A plurality of reinforcement strips are arranged in parallel, and the reinforcement strips are arranged perpendicular to the foot strips.

Referring to FIG. 5 , in some embodiments of the present invention, the coil 310 is compressed and supported by the pressing block 350 , and does not need to be fixed and supported by a clamp. When the coil 310 is supported by the clip, the clip is bulky and will shield the coil air duct 330 in a large area. When the coil 350 is supported by the pressing blocks 350, each coil 310 only needs to be supported by three pressing blocks 350, and each pressing block 350 is individually connected to the coil. Pieces are smaller. Compared with the solution supported by the clip, the support by the pressing block 350 can reduce the shielding area of the coil 310 and improve the heat dissipation capability.

The above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, as long as the technical effects of the present invention are achieved by the same means, they should all belong to the protection scope of the present invention.

Claims (10)

1. A novel dry-type transformer, characterized in that includes:

a transformer body including a coil;

the transformer comprises a shell, a transformer body and a ventilation duct, wherein the shell is provided with a longitudinal ventilation duct, the transformer body is positioned in the ventilation duct, the shell is provided with an air inlet and an air outlet, the air inlet and the air outlet are both communicated with the ventilation duct, the air inlet is positioned below the transformer body, and the air outlet is positioned above the transformer body so as to form a chimney effect; the coil is provided with a longitudinal coil air duct; the lower portion of the coil is at a higher operating temperature than the upper portion of the coil to enhance the chimney effect.

2. The novel dry-type transformer of claim 1, wherein the housing is provided with an air outlet portion, and the ventilation duct comprises an air outlet pipe arranged in the air outlet portion; the tail end of the air outlet pipeline is the air outlet, and the air outlet pipeline gradually narrows towards the air outlet.

3. The new dry transformer as claimed in claim 1, wherein a partition is disposed between the housing and the transformer body, and a first longitudinal ventilation gap is formed between the partition and the transformer body.

4. The new dry transformer as claimed in claim 3, wherein said ventilation duct comprises an air inlet duct, said air inlet duct being located at a lower portion of said housing; the head end of the air inlet pipeline is the air inlet.

5. The novel dry-type transformer of claim 4, wherein the air inlet duct is provided with a plurality of air inlet ducts; the air inlet pipelines are arranged around the transformer body, and the air outlet directions of the air inlet pipelines face the transformer body.

6. A novel dry transformer as claimed in claim 1 wherein the outer surface of said coil is provided with transverse annular air passages.

7. The novel dry-type transformer as claimed in claim 6, wherein the annular air passage has a plurality of turns, the plurality of turns of the annular air passage are spaced from bottom to top along the coil, and the width of the plurality of turns of the annular air passage gradually increases from bottom to top.

8. The novel dry-type transformer as claimed in claim 1, wherein the number of turns of the coil is gradually reduced from bottom to top, and the conductor cross section of the coil is gradually increased from bottom to top.

9. The novel dry-type transformer of claim 1, wherein the coil comprises a high voltage coil and a low voltage coil, the high voltage coil is wound around the outside of the low voltage coil, and the coil air duct comprises a first coil air duct formed between the high voltage coil and the low voltage coil.

10. The new dry transformer of claim 9, wherein the coil air duct further comprises a second coil air duct and a third coil air duct; the second coil duct is formed inside the low-voltage coil, and the third coil duct is formed inside the high-voltage coil.

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