Double-split transformer and coil structure thereof

Abstract

The utility model belongs to the technical field of transformer design, and particularly relates to a double-split transformer and a coil structure thereof. The coil structure of the double-split transformer comprises the first barrel-shaped whole body which is formed by combining the insulating materials and comprises the high-voltage coil body, and the first barrel-shaped whole body is provided with a plurality of through holes used for heat dissipation, so that heat dissipation can be conducted on the high-voltage coil body of the double-split transformer. The plurality of through holes play a stronger role in guiding and ventilating, and the conditions of steady flow and airflow internal circulation occurring in a single guiding heat dissipation structure surrounding the coil body, such as a shielding cylinder, are reduced as much as possible, so that the heat dissipation performance is improved, and the heat dissipation effect is optimized; the high-voltage coil is arranged to be a whole barrel-shaped whole, and the problem that through holes are blocked among different barrel-shaped whole bodies can be avoided; and the through hole with two through ends is an axially corresponding air duct with two through upper and lower ends, namely, the through hole is arranged to have two through ends relative to the cylindrical whole, so that the heat dissipation guiding capability is further enhanced, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer design, and in particular relates to a double-split transformer and a coil structure thereof. Background Art

[0002] Due to the advantages of energy saving, environmental protection and maintenance-free of dry-type transformers, energy storage dry-type transformers have been widely used in energy storage systems. As supporting unit modules for various energy storage application scenarios in energy storage systems, they connect energy storage converters and high-voltage circuit breakers, such as Figure 1 The figure shows the application scenario of the energy storage dry-type transformer in the energy storage system. In the prior art, a double-split transformer and other transformers that meet the requirements can be used in this scenario.

[0003] Existing transformers often sheath the high-voltage coil on the low-voltage coil. For example, the Chinese utility model patent with the authorization announcement number CN218241555U discloses a three-phase five-column double reverse star axial double-split rectifier transformer body insulation structure, which includes a three-phase five-column iron core, each of which is sheathed with a primary coil arranged on the outer layer and a secondary coil arranged on the inner layer. A shielding cylinder is provided between the primary coil and the secondary coil, which can achieve insulation shielding of the primary coil and the secondary coil, further reduce the transformer leakage inductance and electromagnetic interference, and also have the function of guiding ventilation, further improving the heat dissipation of the product; and a primary coil is provided between the primary coil and the secondary coil. When the coil is wound, it is divided into an upper winding and a lower winding that are symmetrical up and down, and finally cast into one piece. On the one hand, it improves the overall mechanical strength of the coil, and on the other hand, it improves the heat dissipation of the product; the secondary coil is a split secondary coil with an upper coil and a lower coil, and the upper coil and the lower coil are axially stacked through inter-segment insulating pads to ensure the coaxiality of the shielding tube; the structure of the double-split transformer mainly relies on the guided ventilation of the shielding tube between the primary coil and the secondary coil for heat dissipation, and steady flow and internal circulation of airflow may occur inside the shielding tube, causing the gas to be trapped in the shielding tube and unable to exchange gas with the outside world, resulting in poor heat dissipation effect. Utility Model Content

[0004] The utility model aims to provide a double-split transformer and a coil structure thereof, which are used to solve the problem of poor heat dissipation of the existing double-split transformer structure.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a coil structure of a double-split transformer, wherein the coil structure comprises a first cylindrical whole including a high-voltage coil body combined by insulating material, and the first cylindrical whole has a plurality of through holes for heat dissipation.

[0006] Furthermore, the coil structure also includes a second cylindrical entity including an upper coil winding of a low-voltage coil body and a third cylindrical entity including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials, and the second and third cylindrical entities also have a plurality of through holes for heat dissipation.

[0007] Furthermore, the first, second and third cylindrical bodies are combined with the insulating material by integrally casting the insulating material.

[0008] Furthermore, the through hole is a wind duct with upper and lower ends that are transparent and correspond to the axial direction of the coil structure; the openings of the upper and / or lower ends of some or all of the through holes are arranged in a ring structure around the axis of the cylindrical body.

[0009] Furthermore, the annular structure includes a plurality of rings which are arranged in sequence.

[0010] Furthermore, the high-voltage coil body includes an upper coil winding and a lower coil winding which are electromagnetically divided axially; the first cylindrical body also includes insulating parts at the upper end, lower end and / or between the coil windings in the high-voltage coil body.

[0011] Furthermore, the insulating material is epoxy resin.

[0012] Furthermore, the second and third cylindrical bodies each include an isolation turn; the isolation turn is respectively wound around the outside of the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail overlaps of the isolation turn are isolated by insulating material.

[0013] Furthermore, the coil structure also includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical body; the connection terminals and voltage-dividing terminals are respectively arranged on both sides of the first cylindrical body;

[0014] The connecting terminals include connecting terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to connect the three-phase upper coil winding and the three-phase lower coil winding to form a triangle connection; the voltage dividing terminals include voltage dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to adjust the voltage of the upper and lower coil windings.

[0015] The beneficial effects of the technical solution of the coil structure of the above-mentioned double-split transformer of the utility model include: for the high-voltage coil body of the double-split transformer, a stronger guiding ventilation effect is achieved through a plurality of through holes, and the steady flow and internal circulation of airflow occurring inside a single guiding heat dissipation structure such as a shielding tube surrounding the coil body are minimized, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coil is combined into a cylindrical whole through insulating material, which can also avoid the problem of blocking the through holes between different cylindrical wholes.

[0016] The utility model also provides a double-split transformer, including a coil structure, wherein the coil structure includes a first cylindrical whole including a high-voltage coil body combined by insulating materials, and the first cylindrical whole has a plurality of through holes for heat dissipation.

[0017] Furthermore, the coil structure also includes a second cylindrical entity including an upper coil winding of a low-voltage coil body and a third cylindrical entity including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials, and the second and third cylindrical entities also have a plurality of through holes for heat dissipation.

[0018] Furthermore, the first, second and third cylindrical bodies are combined with the insulating material by integrally casting the insulating material.

[0019] Furthermore, the through hole is a wind duct with upper and lower ends that are transparent and correspond to the axial direction of the coil structure; the openings of the upper and / or lower ends of some or all of the through holes are arranged in a ring structure around the axis of the cylindrical body.

[0020] Furthermore, the annular structure includes a plurality of rings which are arranged in sequence.

[0021] Furthermore, the high-voltage coil body includes an upper coil winding and a lower coil winding which are electromagnetically divided axially; the first cylindrical body also includes insulating parts at the upper end, lower end and / or between the coil windings in the high-voltage coil body.

[0022] Furthermore, the insulating material is epoxy resin.

[0023] Furthermore, the second and third cylindrical bodies each include an isolation turn; the isolation turn is respectively wound around the outside of the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail overlaps of the isolation turn are isolated by insulating material.

[0024] Furthermore, the coil structure also includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical body; the connection terminals and voltage-dividing terminals are respectively arranged on both sides of the first cylindrical body;

[0025] The connecting terminals include connecting terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to connect the three-phase upper coil winding and the three-phase lower coil winding to form a triangle connection; the voltage dividing terminals include voltage dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to adjust the voltage of the upper and lower coil windings.

[0026] The beneficial effects of the technical solution of the above-mentioned double-split transformer of the utility model include: for the high-voltage coil body of the double-split transformer, a stronger guiding ventilation effect is achieved through a plurality of through holes, and the steady flow and internal circulation of airflow occurring inside a single guiding heat dissipation structure such as a shielding tube surrounding the coil body are minimized, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coil is combined into a cylindrical whole through insulating material, which can also avoid the problem of blocking the through holes between different cylindrical wholes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the application scenario of the energy storage dry-type transformer in the energy storage system in the background technology of the utility model;

[0028] Figure 2 It is a cross-sectional view of the first cylindrical whole in the coil structure in the double-split transformer embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the connection structure corresponding to the second and third cylindrical integral bodies in the coil structure in the embodiment of the double-split transformer of the utility model;

[0030] Figure 4 It is a top view of the first cylindrical whole in the embodiment of the double-split transformer of the utility model;

[0031] Figure 5 It is a top view of the second and third cylindrical components in the double-split transformer embodiment of the utility model;

[0032] Figure 6 It is a side view of the overall structure of the double-split transformer in the double-split transformer embodiment of the utility model;

[0033] Figure 7 It is a front view of the overall structure of the double-split transformer in the double-split transformer embodiment of the utility model;

[0034] In the figure, 1 is an iron core, 2 is a first lead-out copper bar, 3 is a second lead-out copper bar, 4 is a connecting bar, 5 is a pad, 6 is an upper coil winding of a high-voltage coil, 7 is a lower coil winding of a high-voltage coil, 8 is a second cylindrical whole, 9 is a third cylindrical whole, 10 is a voltage dividing terminal corresponding to the upper coil winding and the lower coil winding of the high-voltage coil, 11 is an intermediate pad, 12 is an upper clamp, 13 is a lower clamp, 14 is a connecting copper bar, 15 is an isolation turn lead, 16 is a connecting terminal corresponding to the upper coil winding and the lower coil winding of the high-voltage coil, 17 is a first Connecting rod, 18 is the second connecting rod, 19 is the lead wire for connecting the connecting terminal 16, 20 is the lead wire of the upper coil winding and the lower coil winding of the high-voltage coil, 21 is the grounding bolt, 22 is the isolation turn, 23 is the air duct of the first cylindrical whole, 24 is the insulating material used to be arranged at the overlap between the head and tail of the isolation turn, 25 is the insulating part of the upper end of the upper coil winding of the high-voltage coil and the lower end of the lower coil winding, 26 is the insulating part between the upper coil and the lower coil winding of the high-voltage coil, 27 is the first cylindrical whole, and 28 is the air duct of the second and third cylindrical wholes. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Double Split Transformer Embodiment

[0037] This embodiment provides a technical solution for a double-split transformer, which includes a coil structure; the coil structure includes a first cylindrical whole including a high-voltage coil body combined by an insulating material, wherein the high-voltage coil body includes an upper coil winding and a lower coil winding electromagnetically divided axially; the first cylindrical whole has a plurality of through holes for heat dissipation. Thus, a stronger guiding and ventilation effect can be achieved for the high-voltage coil body of the double-split transformer through a plurality of through holes, so as to minimize the steady flow and airflow internal circulation inside a single guiding heat dissipation structure such as a shielding cylinder surrounding the coil body, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coil is set as a whole cylindrical whole, and the problem of blocking through holes between different cylindrical wholes can also be avoided. In order to ensure the insulation performance of the high-voltage coil body, the first cylindrical whole also includes an insulating part between the upper end, the lower end and the coil winding of the coil body, thereby enabling the coil body to be combined with the corresponding insulating part as a whole, which is convenient for overall application and improves the overall strength. In other embodiments, only a part of the insulating part can be cast into the cylindrical whole.

[0038] In addition, the coil structure also includes a second cylindrical whole including an upper coil winding of a low-voltage coil body and a third cylindrical whole including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials, and the second and third cylindrical wholes also have a number of through holes for heat dissipation. Thus, it is also possible to achieve a stronger guiding ventilation effect through a number of through holes for the two coil windings (the upper coil winding and the lower coil winding of the low-voltage coil body) split from the low-voltage coil body of the double-split transformer. Combined with the above-mentioned guiding ventilation design for the high-voltage coil, it is possible to perform guided ventilation at the high-voltage coil and the low-voltage coil respectively, and the heat dissipation efficiency is higher. The low-voltage coil body is divided into two cylindrical wholes, and it is also possible to avoid the formation of a guiding structure similar to a shielding cylinder surrounding the low-voltage coil body between the cylindrical whole corresponding to the high-voltage coil and the cylindrical whole corresponding to the low-voltage coil, thereby reducing the steady flow and airflow internal circulation inside the coil structure to improve the heat dissipation performance.

[0039] In this embodiment, the through holes at both ends are axially corresponding air ducts that are transparent at the upper and lower ends, that is, the through holes are set to be transparent at both ends relative to the cylindrical whole, further enhancing the heat dissipation guiding ability and improving the heat dissipation effect.

[0040] by Figure 2 As an example, refer to the structure corresponding to the high-voltage coil of the double-split transformer shown in FIG. Figure 2 In the first cylindrical whole 27 of the high-voltage coil body of the double-split transformer, the air duct 23 penetrates the upper coil winding 6 and the lower coil winding 7 of the high-voltage coil, so as to achieve the effect of axially corresponding upper and lower ends being transparent; specifically, the first cylindrical whole 27 also includes an insulating member 25 at the upper end of the upper coil winding and the lower end of the lower coil winding and an insulating member 26 between the upper coil and the lower coil winding; specifically, the first, second and third cylindrical wholes are combined by insulating materials by integrally casting the insulating materials, and the insulating materials are epoxy resins, then the upper coil winding 6 of the high-voltage coil ( The upper high-voltage coil (also referred to as the upper high-voltage coil) and the lower coil winding 7 (also referred to as the lower high-voltage coil), the insulating part 25 at the upper end of the upper coil winding and the lower end of the lower coil winding, the insulating part 26 between the upper coil and the lower coil winding and other components are integrally cast by epoxy resin to form a first cylindrical whole 27 so that it can be mounted on the corresponding structure of the low-voltage coil of the double-split transformer; in other embodiments, only one or several of the insulating part 25 at the upper end of the upper coil winding and the lower end of the lower coil winding, and the insulating part 26 between the upper coil and the lower coil winding can be cast in the first cylindrical whole 27.

[0041] The upper coil winding and the lower coil winding of the low-voltage coil of the double-split transformer are cast into two other cylindrical bodies by epoxy resin distribution and integration, namely the second cylindrical body 8 and the third cylindrical body 9. Since the second cylindrical body 8 and the third cylindrical body 9 correspond to the upper coil winding and the lower coil winding of the low-voltage coil, the second cylindrical body 8 can be directly regarded as the upper coil winding of the low-voltage coil, and the third cylindrical body 9 can be regarded as the lower coil winding of the low-voltage coil. The specific connection relationship in the double-split transformer is as follows: Figure 3 As shown, the second cylindrical whole 8 and the third cylindrical whole 9 can be mounted on the core of the iron core of the double-split transformer. In other embodiments, the insulating materials used for casting the first, second and third cylindrical wholes can be different types of insulating materials, which can be flexibly selected according to needs.

[0042] In fact, under the premise of not affecting the electromagnetic structure of the winding and ensuring the integrity of the winding, the structure of these air ducts is interspersed between the windings of the coil windings of the coil body; before pouring, the coil windings are first wound according to the pre-designed tooling with reserved air duct positions, and then poured through insulating materials. After the pouring is completed, the tooling is removed to obtain a cylindrical entity with through holes (air ducts) at both ends interspersed between the coil windings of the coil body.

[0043] In order to make the distribution position of the air ducts more compatible with the distribution position of the coil bodies in each cylindrical structure to achieve better ventilation and heat dissipation effect, the openings at the upper and lower ends of some or all of the air ducts in the coil structure are arranged in a ring structure around the axis of the cylindrical structure, such as Figure 4 The figure is a top view of the first cylindrical whole. In this embodiment, the openings at the upper and lower ends of the cylindrical integral air duct 23 of the structure corresponding to the high-voltage coil are all arranged in a single ring around the axis of the cylindrical whole; and, in order to adapt to different high-voltage current sizes or meet different temperature rise or heat dissipation requirements, the ring structure can include a plurality of rings arranged in sequence, such as Figure 5 The top view of the second and third cylindrical wholes shown (the annular structure including multiple rings arranged in sequence can be flexibly applied to the structure corresponding to the low-voltage coil and the structure corresponding to the high-voltage coil), wherein the openings of the upper and lower ends of the air duct 28 are all arranged in two rings arranged in sequence around the axis of the cylindrical whole; in other embodiments, the air ducts in the cylindrical wholes of the structures corresponding to the high-voltage coil and the low-voltage coil can be arranged in a single ring arrangement or in two or more ring arrangements arranged in sequence, or the air duct 23 corresponding to the high-voltage coil is arranged in multiple rings arranged in sequence and the air duct 28 corresponding to the low-voltage coil is arranged in a single ring, etc., which can be freely arranged according to actual working conditions and needs. Since the air duct is not necessarily a straight cylindrical structure parallel to the axis, in other embodiments, the arrangement of the openings at the upper and lower ends of the air duct is not necessarily the same, and can also be specifically arranged according to actual working conditions and needs.

[0044] An isolation turn is provided between the low-voltage coil and the high-voltage coil of the double-split transformer; the isolation turn is respectively wound on the outside of the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail overlap of the isolation turn is isolated by insulating material; in this embodiment, the isolation turn is directly cast in the second and third cylindrical entities, that is, the second and third cylindrical entities both contain isolation turns. Specifically, the isolation turn is a foil strip made of metal such as copper foil or aluminum foil, and has the same winding height as the conductor of the upper low-voltage coil or the lower low-voltage coil. One turn is wound on the outside of the upper low-voltage coil and the outside of the lower low-voltage coil. The head and tail of the isolation turn are not connected, and the head and tail overlap is isolated by insulating material so that no closed turn is formed, and the tail end of the isolation turn is led out by an isolation turn lead 15, as shown Figure 3 As shown; Figure 7 As shown, the isolation turn leads 15 of the three-phase coils of the double-split transformer are connected together by the connecting copper bar 14, and connected to the grounding bolts 21 of the upper clamp 12 and the lower clamp 13 to form a ground; the functions of the isolation turn are, firstly, to improve the capacitance between the isolation turn and the high and low voltage coils, so that the electric field between the high and low voltage coils is uniform, and secondly, the large current generated when the transformer short-circuit fails is connected to the ground through the isolation turn lead, so as to avoid burning the rear connection equipment due to the transformer failure.

[0045] In this embodiment, the coil structure of the double-split transformer also includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil drawn from the first cylindrical body; the connection terminals and voltage-dividing terminals are respectively arranged on both sides of the first cylindrical body, such as Figure 2 As shown, the voltage-dividing terminals corresponding to the high-voltage coil include voltage-dividing terminals 10 corresponding to the upper coil winding and the lower coil winding, respectively, which are used to adjust the voltage of the upper and lower high-voltage coils; the connecting terminals include connecting terminals 16 corresponding to the upper coil winding and the lower coil winding, respectively, which are used to connect the three-phase upper coil winding and the three-phase lower coil winding to form a triangle connection; refer to Figure 4 By arranging the voltage-dividing terminal 10 and the connecting terminal 16 on both sides of the first cylindrical body respectively, the problem of coil discharge failure and burning caused by insufficient insulation distance due to the height size limitation of the high-voltage coil or insufficient electrical insulation distance between the connecting terminal and the voltage-dividing terminal when the two are in the same plane can be avoided.

[0046] Specifically, the overall structure of the double split transformer is shown in FIG. Figure 6 and Figure 7 , except for the first cylindrical whole 27 (wherein the first cylindrical whole 27 includes the air duct 23 in the first cylindrical whole, the upper coil winding 6 of the high-voltage coil body, the lower coil winding 7, the insulating member 25 at the upper end of the upper coil winding 6 and the lower end of the lower coil winding 7, and the insulating member 26 between the upper coil and the lower coil winding, etc., therefore Figure 6 , Figure 7 In addition to the components corresponding to the coil structure such as the second cylindrical whole 8 (i.e., the upper low-voltage coil), the third cylindrical whole 9 (i.e., the lower low-voltage coil), etc., it also includes other components such as the iron core 1, the upper clamp 12, the lower clamp 13, the cushion block 5, the first lead-out copper bus 2, the second lead-out copper bus 3, the connecting bus 4, the connecting copper bus 14, the first connecting rod 17, the second connecting rod 18, etc. The upper clamp 12 and the lower clamp 13 are made of steel plates with a certain strength by cutting, bending and welding. The upper clamp 12 and the lower clamp 13 are respectively arranged on both sides of the core 1 and the upper end and the lower end of the core. The second cylindrical whole 8 and the third cylindrical whole 9 are axially mounted on the three core columns of the core 1. The second cylindrical whole 8 is mounted above the core column of the core 1, and the third cylindrical whole 9 is mounted below the core column of the core 1; the first cylindrical whole 27 is correspondingly mounted on the outside of the second cylindrical whole 8 and the third cylindrical whole 9; the second cylindrical whole 8 and the third cylindrical whole 9 are isolated and supported by the intermediate pad 11 (in this embodiment, the air duct 28 is a part of the second cylindrical whole 8 and the third cylindrical whole 9, but because it is inside the second cylindrical whole 8 and the third cylindrical whole 9, Figure 6 , Figure 7 The lower clamp 13 supports the cushion block 5, and the cushion block 5 supports the lower part of the first cylindrical whole 27 and the third cylindrical whole 9, so that the cushion block 5 and the upper clamp 12 and the lower clamp 13 press and fix the first cylindrical whole 27, the second cylindrical whole 8 and the third cylindrical whole 9, so that the first cylindrical whole 27, the second cylindrical whole 8 and the third cylindrical whole 9 can be fixed on the core column. It should be noted that in order to show the overall structure of pressing the second cylindrical whole 8 and the third cylindrical whole 9, Figure 7 The structure of the middle cushion block 11 is drawn in perspective, but in actual circumstances the middle cushion block 11 is blocked by the first cylindrical entity 27 .

[0047] The coils of the three core columns constitute the three-phase high-voltage coils A, B, C and the three-phase low-voltage coils a, b, c of the transformer. The first connecting rod 17 and the second connecting rod 18 connect the upper connecting terminal 16 of the first cylindrical whole 27 containing the three-phase high-voltage coil to form a triangle connection, and connect the lower connecting end 16 of the first cylindrical whole 27 to form a triangle connection. The lead-out wire 19 connects the upper and lower connecting terminals 16 of the first cylindrical whole 27, and the upper coil winding 6 and the lower coil winding 7 of the high-voltage coil in the first cylindrical whole 27 are connected in parallel through the lead-out wire 20. The upper end of the second cylindrical whole 8 is provided with a first lead-out copper bar 2 (corresponding to the three-phase coils a1, b1, c1 respectively) and a second lead-out copper bar 3 (corresponding to the three-phase coils x1, y1, z1 respectively), and the second lead-out copper bar 3 (corresponding to the three-phase coils x1, y1, z1 respectively) of the second cylindrical whole 8 containing the three-phase upper low-voltage coil is connected by a connecting bar 4 to form Y connection, the lower end of the third cylindrical whole 9 is provided with a first lead copper bar 2 (corresponding to the three-phase coils a2, b2, c2) and a second lead copper bar 3 (corresponding to the three-phase coils x2, y2, z2), and the second lead copper bar 3 (corresponding to the three-phase coils x2, y2, z2) of the third cylindrical whole 9 containing the three-phase lower low-voltage coil is connected by a connecting bar 4 to form a Y connection; the upper low-voltage coil and the lower low-voltage line in the second cylindrical whole 8 and the third cylindrical whole 9 are connected. The outside of the coil is wound with a foil isolation turn 22 made of copper foil or aluminum foil, and the head and tail overlaps are isolated with insulating material 24. The isolation turn 22 is also cast in the second cylindrical body 8 and the third cylindrical body 9, and is led out with an isolation turn lead 15; the isolation turn lead 15 is placed on the opposite side of the lead copper bars 2 and 3, and the isolation turn leads 15 of the second cylindrical body 8 and the third cylindrical body 9 of the three-phase core column are connected together with connecting copper bars 14, and then connected to the grounding bolt 21. Since the specific connection principle and connection method of the three-phase coil belong to the existing technology, it will not be repeated here.

[0048] Coil structure embodiment of double split transformer

[0049] This embodiment provides a technical solution for the coil structure of a double-split transformer, the coil structure includes a first cylindrical whole including a high-voltage coil body combined by insulating materials, wherein the high-voltage coil body includes an upper coil winding and a lower coil winding electromagnetically divided axially; the first cylindrical whole has a plurality of through holes for heat dissipation. Thus, a stronger guiding ventilation effect can be achieved for the high-voltage coil body of the double-split transformer through a plurality of through holes, and the steady flow and airflow internal circulation inside a single guiding heat dissipation structure such as a shielding cylinder surrounding the coil body can be minimized, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coil is set as a whole cylindrical whole, and the problem of blocking through holes between different cylindrical wholes can also be avoided. In order to ensure the insulation performance of the high-voltage coil body, the first cylindrical whole also includes insulating parts between the upper end and the lower end of the coil winding in the coil body and the coil winding.

[0050] In addition, the coil structure also includes a second cylindrical whole including an upper coil winding of a low-voltage coil body and a third cylindrical whole including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials, and the second and third cylindrical wholes also have a number of through holes for heat dissipation. Thus, it is also possible to achieve a stronger guiding ventilation effect through a number of through holes for the two coil windings (the upper coil winding and the lower coil winding of the low-voltage coil body) split from the low-voltage coil body of the double-split transformer. Combined with the above-mentioned guiding ventilation design for the high-voltage coil, it is possible to perform guided ventilation at the high-voltage coil and the low-voltage coil respectively, and the heat dissipation efficiency is higher. The low-voltage coil body is divided into two cylindrical wholes, and it is also possible to avoid the formation of a guiding structure similar to a shielding cylinder surrounding the low-voltage coil body between the cylindrical whole corresponding to the high-voltage coil and the cylindrical whole corresponding to the low-voltage coil, thereby reducing the steady flow and airflow internal circulation inside the coil structure to improve the heat dissipation performance.

[0051] In this embodiment, the through holes at both ends are axially corresponding air ducts that are transparent at the upper and lower ends, that is, the through holes are set to be transparent at both ends relative to the cylindrical whole, further enhancing the heat dissipation guiding ability and improving the heat dissipation effect.

[0052] Specifically, the first, second and third cylindrical entities are combined by insulating material by integrally casting the insulating material, and the insulating material is epoxy resin. In other embodiments, the insulating material used to cast the first, second and third cylindrical entities can be different types of insulating materials, which can be flexibly selected according to needs.

[0053] In fact, under the premise of not affecting the electromagnetic structure of the winding and ensuring the integrity of the winding, the structure of these air ducts is interspersed between the windings of the coil windings of the coil body; before pouring, the coil windings are first wound according to the pre-designed tooling with reserved air duct positions, and then poured through insulating materials. After the pouring is completed, the tooling is removed to obtain a cylindrical entity with through holes (air ducts) at both ends interspersed between the coil windings of the coil body.

[0054] In order to make the distribution position of the air ducts more compatible with the distribution position of the coil bodies in each cylindrical structure to achieve better ventilation and heat dissipation effect, the openings at the upper and lower ends of some or all of the air ducts in the coil structure are arranged in a ring structure around the axis of the cylindrical structure, such as Figure 4 The figure is a top view of the first cylindrical whole. In this embodiment, the openings at the upper and lower ends of the cylindrical integral air duct 23 of the structure corresponding to the high-voltage coil are all arranged in a single ring around the axis of the cylindrical whole; and, in order to adapt to different high-voltage current sizes or meet different temperature rise or heat dissipation requirements, the ring structure can include a plurality of rings arranged in sequence, such as Figure 5 The top view of the cylindrical whole of the structure corresponding to the low-voltage coil shown (the annular structure including multiple rings arranged in sequence can be flexibly applied to the structure corresponding to the low-voltage coil and the structure corresponding to the high-voltage coil), wherein the openings of the upper and lower ends of the air duct 28 are all arranged in two rings arranged in sequence around the axis of the cylindrical whole; in other embodiments, the air ducts in the first, second and third cylindrical wholes can be arranged in a single ring arrangement or in two or more ring arrangements arranged in sequence, or the air duct 23 in the first cylindrical whole is arranged in multiple rings arranged in sequence and the air duct 28 in the second and third cylindrical wholes is arranged in a single ring, etc., which can be freely arranged according to actual working conditions and needs. Since the air duct is not necessarily a straight cylindrical structure parallel to the axis, in other embodiments, the arrangement of the openings at the upper and lower ends of the air duct is not necessarily the same, and can also be specifically arranged according to actual working conditions and needs.

[0055] Specifically, the coil structure of the double-split transformer in this embodiment is actually the coil structure included in the double-split transformer in the above-mentioned double-split transformer embodiment; since other settings and principles of the coil structure related to the double-split transformer in this embodiment have been described in detail in the above-mentioned double-split transformer embodiment, they will not be repeated here.

[0056] The utility model has the following features:

[0057] 1) The coil structure includes a first cylindrical whole of the high-voltage coil body, and the cylindrical whole has a number of through holes at both ends for heat dissipation. Therefore, the high-voltage coil body of the double-split transformer can be provided with a stronger guiding ventilation effect through a number of through holes, and the steady flow and airflow internal circulation inside a single guiding heat dissipation structure such as a shielding tube surrounding the coil body can be minimized, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coil is combined into a cylindrical whole by insulating materials, which can also avoid the problem of blocking through holes between different cylindrical wholes;

[0058] 2) The coil structure also includes a second cylindrical whole including an upper coil winding of the low-voltage coil body and a third cylindrical whole including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials, and both have a number of through holes for heat dissipation. Thus, it is also possible to achieve a stronger guiding ventilation effect through a number of through holes for the two coil windings (the upper coil winding and the lower coil winding of the low-voltage coil body) split from the low-voltage coil body of the double-split transformer. Combined with the above-mentioned guiding ventilation design for the high-voltage coil, it is possible to perform guiding ventilation at the high-voltage coil and the low-voltage coil respectively, with higher heat dissipation efficiency; the low-voltage coil body is divided into two cylindrical wholes, which can also avoid the formation of a guiding structure similar to a shielding cylinder surrounding the low-voltage coil body between the cylindrical whole corresponding to the high-voltage coil and the cylindrical whole corresponding to the low-voltage coil, thereby reducing the steady flow and airflow internal circulation inside the coil structure to improve the heat dissipation performance.

[0059] 3) The through holes at both ends are transparent air ducts at the upper and lower ends corresponding to the axial direction of the coil structure, that is, the through holes are set to be transparent at both ends relative to the cylindrical whole, further enhancing the heat dissipation guiding ability and improving the heat dissipation effect;

[0060] 4) The openings at the upper and lower ends of some or all of the through holes are arranged along a ring structure around the axis of the cylindrical body, so that the distribution position of the air duct can be more matched with the distribution position of the coil body in the cylindrical body to achieve better ventilation and heat dissipation effects; and the ring structure includes multiple rings that are arranged in sequence, which can adapt to different high-voltage current sizes or meet different temperature rise or heat dissipation requirements.

[0061] It should be understood that the above specific embodiments of the present invention are only used to exemplify or explain the principles of the present invention, and do not constitute a limitation to the present invention.

Claims

1. The coil structure of the double-split transformer is characterized in that: The coil structure includes a first cylindrical entity including a high-voltage coil body which is combined by insulating material, and the first cylindrical entity has a plurality of through holes for heat dissipation; the coil structure also includes connecting terminals and voltage dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical entity; the connecting terminals and voltage dividing terminals are respectively arranged on both sides of the first cylindrical entity.

2. The coil structure of the double-split transformer according to claim 1 is characterized in that: The coil structure also includes a second cylindrical whole including an upper coil winding of a low-voltage coil body and a third cylindrical whole including a lower coil winding of the low-voltage coil body, which are respectively combined by insulating materials. The second and third cylindrical wholes also have a plurality of through holes for heat dissipation.

3. The coil structure of the double-split transformer according to claim 2 is characterized in that: The first, second and third cylindrical bodies are connected by insulating materials by integrally casting the insulating materials.

4. The coil structure of the double-split transformer according to any one of claims 1 to 3, characterized in that: The through holes are air ducts with upper and lower ends that are transparent and correspond to the axial direction of the coil structure; the openings of the upper and / or lower ends of some or all of the through holes are arranged in a ring structure around the axis of the cylindrical body.

5. The coil structure of the double-split transformer according to claim 4, characterized in that: The annular structure comprises a plurality of rings which are arranged in sequence.

6. The coil structure of the double-split transformer according to any one of claims 1 to 3, characterized in that: The high-voltage coil body includes an upper coil winding and a lower coil winding which are electromagnetically divided axially; the first cylindrical body also includes insulating parts at the upper end, lower end and / or between the coil windings in the high-voltage coil body.

7. The coil structure of the double-split transformer according to any one of claims 1 to 3, characterized in that: The insulating material is epoxy resin.

8. The coil structure of the double-split transformer according to claim 2 or 3, characterized in that: The second and third cylindrical bodies both contain isolation turns; the isolation turns are respectively wound around the outside of the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail overlaps of the isolation turns are isolated by insulating materials.

9. The coil structure of the double-split transformer according to any one of claims 1 to 3, characterized in that: The connecting terminals include connecting terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to connect the three-phase upper coil winding and the three-phase lower coil winding to form a triangle connection; the voltage dividing terminals include voltage dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body, which are respectively used to adjust the voltage of the upper and lower coil windings.

10. Double split transformer, characterized in that, It includes a coil structure, and the coil structure is the coil structure of a double-split transformer as described in any one of claims 1-9.

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