A coil fixing structure of a dry-type transformer

Abstract

The utility model belongs to coil fixed structure technical field especially relates to a coil fixed structure of dry -type transformer, include: iron core post, along the axial extension setting of dry -type transformer, middle part pad piece, set up in the middle part of iron core post outside, its upper and lower both sides all are provided with first boss part, first boss part is used for separating and limiting respectively the axial position of high -voltage coil and low -voltage coil of the sleeve setting in iron core post outside. The utility model discloses through the cooperation of iron core post, middle part pad piece and end part pad piece, utilizes the axial corresponding relation of first boss part and second boss part, can form accurate spacing to the axial both ends of high -voltage coil and low -voltage coil, effectively prevent the axial displacement of coil in the assembly or running process, compared with prior art, the application realizes the layered fixing of coil through modular pad piece, simplifies assembly process, guarantees the insulation spacing between high -low voltage coil again, improves the stability and security of dry -type transformer operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of coil fixing structure, and particularly relates to a coil fixing structure for a dry-type transformer. Background Technology

[0002] In power transmission and distribution systems, dry-type transformers are widely used in high-rise buildings, subways, data centers, and other scenarios with high fire safety requirements due to the safety and environmental advantages brought by their oil-free design. As the core conductive component of a dry-type transformer, the stability of its fixation to the core column, the reliability of its insulation, and its heat dissipation efficiency directly determine the transformer's service life and safety performance. Therefore, the design of the coil fixing structure has always been one of the core directions in the research and development of dry-type transformer technology. Currently, the coil fixing of dry-type transformers mostly adopts a combination of "pad support + binding strap fastening". That is, by setting several insulating pads on the outside of the iron core column to separate the high-voltage coil and the low-voltage coil, the overall coil is fixed by wrapping the fiberglass binding strap along the axial direction. However, this traditional structure has many technical drawbacks in practical applications: First, the insulating blocks are mostly single rectangular blocks, which can only limit the radial spacing of the coils by their own thickness, and cannot form a precise axial positioning of the coils. This makes the coils prone to misalignment during the assembly process, or axial movement when subjected to vibration during long-term operation, which in turn damages the insulation spacing between the high and low voltage coils, causing partial discharge or even short circuit faults. Second, traditional blocks mostly adopt a spliced ​​structure, which is composed of multiple small insulating boards stacked together. The splicing points are prone to loosening or deformation due to stress concentration. This not only reduces the overall structural integrity, but also requires additional insulating paper, insulating varnish and other auxiliary insulating components to compensate for the insulation defects in the splicing gaps. This increases the number of parts, complicates the assembly process, and increases production costs and maintenance difficulty. Third, in order to ensure fixing strength, traditional structures often use dense binding tape or thickened blocks. This design can block the airflow channel between the coil and the iron core column, making it impossible to quickly dissipate the heat generated by the coil during operation. Especially under high load conditions, the coil temperature is prone to exceed the tolerance limit of the insulating material, accelerating insulation aging and shortening the service life of the transformer. As the power system's demand for dry-type transformer capacity continues to increase, the size and weight of the coils are also increasing accordingly, highlighting the limitations of traditional fixed structures. On the one hand, larger coils require higher axial positioning accuracy, and the limiting capability of a single pad is no longer sufficient, significantly increasing the risk of coil tilting and displacement. On the other hand, the heat dissipation requirements of high-capacity transformers are more urgent, and the contradiction between the enclosed design of traditional structures and heat dissipation needs is becoming increasingly prominent. In addition, the existing fixed structures have poor versatility. When coil parameters (such as radial dimensions and number of layers) change, the entire pad and binding strap must be replaced, resulting in long product adaptation cycles, high modification costs, and difficulty in meeting customized production needs. To address the aforementioned technical challenges, the industry urgently needs a coil fixing structure that features precise positioning, high insulation reliability, efficient heat dissipation, and strong versatility. By optimizing the pad design, modular fixing of the coil can be achieved, simplifying the assembly process, reducing costs, and improving the operational stability and safety of dry-type transformers, thus adapting to the trend of power systems developing towards higher capacity and higher reliability. Utility Model Content

[0003] The purpose of this utility model is to address the aforementioned technical problems by providing a coil fixing structure for a dry-type transformer.

[0004] In view of this, the present invention provides a coil fixing structure for a dry-type transformer, comprising: The core column extends along the axial direction of the dry-type transformer; A central pad is provided in the middle of the outer side of the iron core column. The upper and lower sides of the pad are provided with first protrusions. The first protrusions are used to separate and restrict the axial position of the high voltage coil and the low voltage coil sleeved on the outer side of the iron core column, respectively. A pair of end pads are provided at both ends of the outer side of the iron core column, and a second protrusion is provided on the side of the end pads near the middle pad. The positions of the first boss and the second boss are axially corresponding, and together they restrict the axial ends of the high-voltage coil and the low-voltage coil.

[0005] Preferably, both the middle pad and the end pad are integrally molded from insulating material.

[0006] Preferably, the first boss portion includes a first outer boss, a first intermediate boss, and a first inner boss arranged sequentially from the outside to the inside.

[0007] Preferably, the second boss portion includes a second outer boss, a second intermediate boss, and a second inner boss arranged sequentially from the outside to the inside.

[0008] Preferably, both the first intermediate boss and the second intermediate boss are provided with positioning grooves. Preferably, the positioning groove is composed of multiple interconnected grooves of varying depths.

[0009] Preferably, the first outer boss and the first middle boss are integrally formed with the middle pad block, and the first inner boss is detachably installed on the middle pad block.

[0010] Preferably, the second outer boss and the second middle boss are integrally formed with the end pad, and the second inner boss is detachably installed on the end pad.

[0011] Preferably, a positioning latching block fixed to the outside of the iron core column is provided between the end pad and the middle pad, and the positioning latching block has a latching groove on its outer circumferential side.

[0012] Preferably, a first ventilation channel is provided at the bottom of the iron core column, and a second ventilation channel is provided laterally on the middle pad block, with the first ventilation channel and the second ventilation channel connected.

[0013] The beneficial effects of this utility model are: This invention utilizes the cooperation of the core column, the middle pad, and the end pad, along with the axial correspondence between the first and second protrusions, to precisely limit the axial positions of the high-voltage and low-voltage coils. This effectively prevents axial displacement of the coils during assembly or operation. Compared to existing technologies, this application features a simpler structural design. By using modular pads to achieve layered fixing of the coils, it simplifies the assembly process, ensures the insulation distance between the high-voltage and low-voltage coils, and improves the stability and safety of the dry-type transformer operation. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention after the coil has been installed; Figure 2 This is a schematic diagram of the central pad of this utility model; Figure 3 This is a schematic diagram of the end pad of this utility model; Figure 4 This is a schematic diagram of the positioning card block of this utility model.

[0015] The markings in the diagram are as follows: 1. Core post; 2. Middle pad; 3. First boss; 4. End pad; 5. Second boss; 6. First outer boss; 7. First intermediate boss; 8. First inner boss; 9. Second outer boss; 10. Second intermediate boss; 11. Second inner boss; 12. Positioning groove; 13. Positioning latch; 14. Latch; 15. First ventilation channel; 16. Second ventilation channel; 17. Support component; 18. Coil; 181. High voltage coil; 182. Low voltage coil. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0021] As in 1 Figures 1-4 As shown, a coil fixing structure for a dry-type transformer includes: Core column 1 is provided to extend along the axial direction of the dry-type transformer; The middle pad 2 is located in the middle of the outer side of the iron core column 1. The upper and lower sides of the pad 2 are provided with first protrusions 3. The first protrusions 3 are used to separate and restrict the axial position of the high voltage coil 181 and the low voltage coil 182 sleeved on the outer side of the iron core column 1. A pair of end pads 4 are provided at both ends of the outer side of the iron core column 1. The end pads 4 are provided with a second protrusion 5 on the side near the middle pad 2. The positions of the first boss 3 and the second boss 5 are axially corresponding, and together they restrict the axial ends of the high voltage coil 181 and the low voltage coil 182. The middle pad 2 is fixed to the outside of the core column 1, while the end pad 4 is fixed to the support component 17 inside the transformer.

[0022] This application utilizes the cooperation of the core column 1, the middle pad 2, and the end pad 4, along with the axial correspondence between the first boss 3 and the second boss 5, to precisely limit the axial movement of the high-voltage coil 181 and the low-voltage coil 182, effectively preventing axial displacement of the coil 18 during assembly or operation. The structural design is simple, using modular pads to achieve layered fixing of the coil 18, simplifying the assembly process while ensuring the insulation distance between the high and low voltage coils 182, thus improving the stability and safety of the dry-type transformer operation.

[0023] As a preferred example of this application, both the middle pad 2 and the end pad 4 are integrally molded from insulating materials such as epoxy glass fiber reinforced plastic, phenolic resin-based insulating plastic, polyimide (PI)-based composite material, or silicone resin modified epoxy composite material. This application integrates the middle pad 2 and the end pad 4 with insulating material, which enhances the structural strength and integrity of the pad itself and prevents the spliced ​​structure from loosening or deforming during long-term operation. On the other hand, the insulating material can directly meet the insulation requirements between the coil 18 and the iron core column 1, without the need for additional insulating components, reducing the number of parts and lowering the assembly complexity and cost.

[0024] As a preferred example of this application, the first boss portion 3 includes a first outer boss 6, a first intermediate boss 7 and a first inner boss 8 arranged sequentially from the outside to the inside, and the second boss portion 5 includes a second outer boss 9, a second intermediate boss 10 and a second inner boss 11 arranged sequentially from the outside to the inside. This application configures the first boss portion 3 as a multi-layer structure consisting of a first outer boss 6, a first intermediate boss 7, and a first inner boss 8, which can adapt to the fixing requirements of coils 18 with different radial dimensions or multiple coils 18. The multi-layer bosses can provide multi-dimensional support for the coil 18, disperse the pressure of the coil 18 on the pad, avoid excessive local stress that could damage the pad, and at the same time improve the fit between the coil 18 and the pad, thus enhancing the fixing reliability. The second boss 5 has a multi-layer structure corresponding to the first boss 3, forming a cooperative relationship with the first boss 3. This allows both ends of the coil 18 to be limited by the multi-layer bosses. This design further improves the accuracy of the axial positioning of the coil 18, and is especially suitable for coils 18 with large height or complex structure. It can effectively prevent the coil 18 from tilting or shifting in the axial direction.

[0025] As a preferred example of this application, both the first intermediate boss 7 and the second intermediate boss 10 are provided with positioning grooves 12. The positioning grooves 12 on the first intermediate boss 7 and the second intermediate boss 10 can be used to embed auxiliary fixing parts such as insulating partitions to achieve circumferential positioning between the coil 18 and the pad, and prevent the coil 18 from rotating circumferentially relative to the pad. The setting of the positioning grooves 12 enhances the connection stability between the coil 18 and the fixing structure, and is especially suitable for scenarios where there is vibration during transformer operation.

[0026] As a preferred example of this application, the positioning groove 12 is composed of multiple grooves of different depths connected together, which enables the positioning groove 12 to adapt to inserts of different thicknesses or shapes, improves the versatility of the structure, and the grooves of different depths can form a stepped limit, enhance the engagement between the insert and the positioning groove 12, further prevent the coil 18 or auxiliary parts from loosening, and at the same time facilitate the selection of appropriate groove positions according to actual needs during assembly.

[0027] As a preferred example of this application, the first outer boss 6 and the first intermediate boss 7 are integrally formed with the central pad 2, and the first inner boss 8 is detachably installed on the central pad 2 by a plug-in connection. The integral forming of the first outer boss 6, the first intermediate boss 7, and the central pad 2 ensures structural strength, while the detachable installation of the first inner boss 8 allows the central pad 2 to flexibly adjust the specifications or position of the first inner boss 8 according to the specific dimensions of the coil 18, improving the adaptability of the structure. When the parameters of the coil 18 change or the inner boss is damaged, only the first inner boss 8 needs to be replaced, without replacing the entire central pad 2, reducing maintenance costs.

[0028] As a preferred example of this application, the second outer boss 9 and the second intermediate boss 10 are integrally formed with the end pad 4, and the second inner boss 11 is detachably installed on the end pad 4 by means of plug-in connection. The integral forming of the second outer boss 9 and the second intermediate boss 10 with the end pad 4 ensures the stability of the end structure. The detachable design of the second inner boss 11 allows the end pad 4 to flexibly adapt to the end size of different coils 18, which enhances the versatility and maintainability of the structure and reduces the overall structural modification cost caused by changes in the parameters of the coils 18.

[0029] As a preferred example of the present application, a positioning and clamping block 13 fixed to the outer side of the iron core column 1 is provided between the end cushion block 4 and the middle cushion block 2, and the overall shape is in the shape of a Chinese character 'gan'. A clamping groove 14 is circumferentially formed on the outer side of the positioning and clamping block 13. The positioning and clamping block 13 can be used as an auxiliary fixing structure to further improve the overall stability of the coil 18.

[0030] As a preferred example of the present application, a first ventilation channel 15 is formed at the bottom of the iron core column 1, and a second ventilation channel 16 is horizontally formed on the middle cushion block 2. The first ventilation channel 15 is communicated with the second ventilation channel 16. The first ventilation channel 15 at the bottom of the iron core column 1 is communicated with the second ventilation channel 16 on the middle cushion block 2 to form a through-type heat dissipation air flow path (as Figure 1 shown by the arrow direction in the figure), which can quickly export the heat generated during the operation of the coil 18 through the air flow, thereby improving the heat dissipation efficiency of the dry-type transformer. Compared with the closed structure, the design of the ventilation channel can effectively reduce the working temperature of the coil 18, extend the service life of the insulating material, and improve the operation reliability and overload capacity of the transformer.

[0031] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A coil fixing structure for a dry-type transformer, characterized in that... ,include: The core column (1) is provided to extend along the axial direction of the dry-type transformer; The middle pad (2) is located in the middle of the outer side of the iron core column (1), and the upper and lower sides are provided with first bosses (3). The first bosses (3) are used to separate and restrict the axial position of the high voltage coil (181) and the low voltage coil (182) sleeved on the outer side of the iron core column (1). A pair of end pads (4) are provided at both ends of the outer side of the iron core column (1), and a second boss (5) is provided on the side of the end pads (4) near the middle pad (2). The positions of the first boss (3) and the second boss (5) are axially corresponding, and together they restrict the axial ends of the high voltage coil (181) and the low voltage coil (182).

2. The coil fixing structure of a dry-type transformer according to claim 1, characterized in that, Both the middle pad (2) and the end pad (4) are integrally molded from insulating material.

3. The coil fixing structure of a dry-type transformer according to claim 1, characterized in that, The first boss portion (3) includes a first outer boss (6), a first intermediate boss (7) and a first inner boss (8) arranged sequentially from the outside to the inside.

4. The coil fixing structure of a dry-type transformer according to claim 3, characterized in that, The second boss portion (5) includes a second outer boss (9), a second intermediate boss (10), and a second inner boss (11) arranged sequentially from the outside to the inside.

5. The coil fixing structure of a dry-type transformer according to claim 4, characterized in that, Positioning grooves (12) are provided on both the first intermediate boss (7) and the second intermediate boss (10).

6. The coil fixing structure of a dry-type transformer according to claim 5, characterized in that, The positioning groove (12) is composed of multiple grooves of varying depths connected together.

7. The coil fixing structure of a dry-type transformer according to claim 6, characterized in that, The first outer boss (6) and the first middle boss (7) are integrally formed with the middle pad block, and the first inner boss (8) is detachably installed on the middle pad block (2).

8. The coil fixing structure of a dry-type transformer according to claim 6, characterized in that, The second outer boss (9) and the second middle boss (10) are integrally formed with the end pad (4), and the second inner boss (11) is detachably installed on the end pad (4).

9. The coil fixing structure of a dry-type transformer according to claim 1, characterized in that, A positioning latching block (13) fixed to the outside of the iron core column (1) is provided between the end pad (4) and the middle pad. The positioning latching block (13) has a latching groove (14) on its outer circumferential side.

10. The coil fixing structure of a dry-type transformer according to claim 1, characterized in that, The bottom of the iron core column (1) is provided with a first ventilation channel (15), and the middle pad (2) is provided with a second ventilation channel (16) in the horizontal direction. The first ventilation channel (15) and the second ventilation channel (16) are connected.

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