Body structure and dry-type transformer

Abstract

The utility model discloses a kind of body structure and dry-type transformer.The body structure includes coil, core, clamp piece, cushion block and pressure block. Among them, coil includes high-voltage winding and low-voltage winding with insulating gap in middle;Core includes core column and iron yoke, two groups of clamp piece are respectively installed at the both ends of coil, clamp piece includes two clamping subpieces supports, two clamping subpieces are clamped to iron yoke, support is installed between two clamping subpieces and forms clamping gap with core column;Cushion block includes main body and limiting protrusion, one side of main body is abutted with clamping subpiece, the other side is provided with supporting surface, limiting protrusion protrudes from supporting surface, supporting surface is abutted with coil, limiting protrusion extends into insulating gap and is attached with the side wall of high-voltage winding and low-voltage winding;Pressure block is worn in clamping gap, one side of pressure block is provided with clamping groove and is abutted with core column, and the other side is abutted with support.The body structure has the advantages of strong stability, high vibration resistance.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer body structure and a dry-type transformer. Background Technology

[0002] Transformers are core electrical equipment in electrical engineering, primarily functioning to convert electrical energy between different voltage levels through electromagnetic induction. In the field of new energy wind power, due to the operation of wind turbine generators and the effects of wind loads, transformers operate in a long-term vibration environment. This causes components such as the transformer coils and cores to become loose or even displaced due to vibration. Therefore, in order to improve the operational stability of wind turbine generators, it is urgent to improve the transformers to enhance their vibration resistance. Utility Model Content

[0003] The main purpose of this utility model is to propose a transformer body structure and a dry-type transformer, which aims to improve the transformer's vibration resistance.

[0004] To achieve the above objectives, this utility model proposes a body structure, comprising: A coil, comprising a high-voltage winding and a low-voltage winding, with an insulation gap between the high-voltage winding and the low-voltage winding; The iron core includes a core column and an iron yoke, with the coil sleeved on the core column; Two sets of clamps are installed at both ends of the coil. Each clamp includes two clamping sub-components and two brackets. The two clamping sub-components are arranged opposite each other and clamp the iron yoke. The brackets are installed between the two clamping sub-components and form a clamping gap with the core column. The pad includes a main body and a limiting protrusion. One side of the main body abuts against the clamping part, and the other side of the main body is provided with a support surface. The limiting protrusion protrudes from the support surface. The support surface abuts against the high voltage winding and the low voltage winding. The limiting protrusion extends into the insulation gap and fits against the sidewalls of the high voltage winding and the low voltage winding facing each other. The pressure block is inserted into the clamping gap. A clamping groove is opened on one side of the pressure block, which abuts against the core column. The other side of the pressure block abuts against the bracket.

[0005] In one embodiment, the pad includes a skirt, the main body includes a side wall, the side wall includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall is disposed facing the yoke, the second side wall is disposed opposite to the first side wall, the third side wall and the fourth side wall are disposed opposite to each other, and the skirt protrudes from the second side wall, the third side wall and the fourth side wall.

[0006] In one embodiment, the umbrella skirt is a horizontally extending strip structure.

[0007] In one embodiment, there are multiple umbrella skirts arranged in parallel along the extension direction of the central column.

[0008] In one embodiment, a support seat is formed on the side of the main body near the clamping part, and the side of the support seat away from the support surface abuts against the clamping part. In the horizontal direction, the support seat protrudes from the second side wall, the third side wall and the fourth side wall.

[0009] In one embodiment, the support surface includes a first support surface and a second support surface, and the limiting protrusion includes a first protrusion and a second protrusion. The first support surface abuts against the low-voltage winding, and the first protrusion is in contact with the side wall of the low-voltage winding facing the high-voltage winding. The second support surface abuts against the high-voltage winding, and the second protrusion is in contact with the side wall of the high-voltage winding facing the low-voltage winding.

[0010] In one embodiment, the main body is further provided with a limiting groove, which is provided between the first protrusion and the second protrusion. The coil also includes an insulating cylinder installed between the low-voltage winding and the high-voltage winding, and the end of the insulating cylinder extends into the limiting groove.

[0011] In one embodiment, the clamping groove includes multiple mating surfaces, which are distributed in a multi-level stepped shape. The side of the core column facing the support includes multiple protruding surfaces, which are mated with the mating surfaces.

[0012] In one embodiment, both the pad and the pressure block are integrally molded parts.

[0013] This utility model also proposes a dry-type transformer, including the body structure of any of the above embodiments.

[0014] According to the technical solution of this utility model, the limiting protrusion of the pad extends into the insulation gap of the coil, and the clamping component presses the pad against the end of the coil, so that the clamping component fixes the coil through the pad. The limiting protrusion can limit the radial displacement of the coil, thereby improving the stability of the coil during operation. At the same time, the pressure block abuts against the outer side of the core column, and the support is used to tighten the pressure block, so that the pressure block can clamp the core, thereby improving the stability of the core during operation. In this way, it is beneficial to improve the stability of the transformer body structure, enabling the transformer to adapt to working environments with long-term vibration, and preventing the transformer body structure from shifting or loosening due to vibration. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the body structure provided by this utility model; Figure 2 for Figure 1 A top-view structural diagram; Figure 3 for Figure 1 A schematic diagram of the front structure; Figure 4 for Figure 1 A magnified view of a section at point A in the middle; Figure 5 A schematic diagram of the structure of an embodiment of the pad provided by this utility model; Figure 6 for Figure 5 A schematic diagram of the side structure; Figure 7 for Figure 5 A schematic diagram of the front structure; Figure 8 This is a schematic diagram of the structure of an embodiment of the pressure block provided by this utility model; Figure 9 for Figure 8 A schematic diagram of the front structure.

[0017] Explanation of icon numbers: 100. Vessel structure; 1. Coil; 11. High-voltage winding; 12. Low-voltage winding; 13. Insulation gap; 2. Iron core; 21. Core column; 22. Iron yoke; 3. Clamping component; 31. Clamping sub-component; 32. Bracket; 4. Pad; 41. Main body; 411. Support surface; 4111. First support surface; 4112. Second support surface; 412. First side wall; 413. Third side wall; 414. Support base; 415. Limiting groove; 42. Limiting protrusion; 421. First protrusion; 422. Second protrusion; 43. Umbrella skirt; 5. Pressing block; 51. Clamping groove; 511. Adhesive surface.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] As an indispensable core electrical device in the field of electrical engineering, the transformer's core function lies in achieving efficient conversion of electrical energy between different voltage levels based on the principle of electromagnetic induction. This characteristic makes it play a crucial role in power transmission, distribution, and end-use applications. Especially in the field of new energy wind power, the transformer serves as the energy conversion hub between wind turbine generators and the power grid, and its operational stability directly affects the power generation efficiency and power supply quality of the entire wind power system.

[0023] However, according to the applicant's observations and research, due to the long-term exposure of wind turbine generators to a complex and ever-changing natural environment, their operation is inevitably subject to continuous wind loads. Combined with the mechanical vibrations generated by the generator's own operation, this results in the transformer operating in a state of constant vibration superposition. This continuous vibration not only accelerates the mechanical wear of internal transformer components but may also cause safety hazards such as loosening of coil windings and displacement of the core structure, thereby affecting the transformer's electromagnetic performance and insulation reliability.

[0024] In view of this, the present invention proposes a body structure to solve or at least alleviate the above problems.

[0025] Please see Figures 1 to 4 ,as well as Figure 5 and Figure 8In one embodiment of this utility model, the device body structure 100 includes a coil 1, an iron core 2, clamps 3, pads 4, and pressure blocks 5. The coil 1 includes a high-voltage winding 11 and a low-voltage winding 12, with an insulation gap 13 between them. The iron core 2 includes a core column 21 and a yoke 22, with the coil 1 fitted onto the core column 21. Two sets of clamps 3 are respectively installed at both ends of the coil 1. Each clamp 3 includes two clamping sub-components 31 and two supports 32. The two clamping sub-components 31 are arranged opposite each other and clamp the yoke 22, while the supports 32 are installed between the two clamping sub-components 31 and form a clamping gap with the core column 21. The pad 4 includes a main body 41. The limiting protrusion 42 and the main body 41 abut against the clamping sub-component 31 on one side, and the main body 41 has a support surface 411 on the other side. The limiting protrusion 42 protrudes from the support surface 411, and the support surface 411 abuts against the high voltage winding 11 and the low voltage winding 12. The limiting protrusion 42 extends into the insulation gap 13 and fits against the side walls of the high voltage winding 11 and the low voltage winding 12 facing each other. The pressure block 5 passes through the clamping gap. A clamping groove 51 is opened on one side of the pressure block 5, and the clamping groove 51 abuts against the core column 21. The other side of the pressure block 5 abuts against the bracket 32.

[0026] Specifically, the clamping component 31 is formed by welding channel steel or steel plates, including a web and a cross plate. The two webs are clamped to the yoke 22 by pulling rods or plates. The cross plate is in contact with the pad 4. The cross plates in the two sets of clamping components 3 are pulled by pulling rods or plates to press the pad 4 against the coil 1, thereby fixing the coil 1 and the iron core 2. In this embodiment, the low-voltage coil 1 is sleeved on the core column 21, and the high-voltage coil 1 is sleeved on the low-voltage coil 1. There are at least two core columns 21. The pressure block 5 is clamped on the sides of the two outermost core columns 21 by the support 32, that is, the pressure block 5 is clamped to the iron core 2 in the left-right direction. Specifically, there are two sets of pressure blocks 5, each set including two pressure blocks 5. The two pressure blocks 5 are arranged opposite each other on the left and right sides of the iron core 2. The support 32 provides pressure to the pressure blocks 5 in the direction of the yoke 22 to press the iron core 2. A steel plate is provided at the connection between the bracket 32 ​​and the clamping component 31, and the pull rod passes through the steel plate to install the bracket 32 ​​onto the clamping component 31.

[0027] In this embodiment, the limiting protrusion 42 is arc-shaped, and the curvature of the limiting protrusion 42 is the same as that of the high-voltage winding 11 and the low-voltage winding 12, so as to increase the contact area between the limiting protrusion 42 and the high-voltage winding 11 and the low-voltage winding 12. Multiple pads 4 are mounted on the upper and lower ends of each coil 1, and the multiple pads 4 are arranged in an array along the circumference of the coil 1 to improve the uniformity of the force on the coil 1.

[0028] According to the technical solution of this embodiment, the limiting protrusion 42 of the pad 4 extends into the insulation gap 13 of the coil 1, and the clamping member 31 presses the pad 4 tightly against the end of the coil 1, so that the clamping member 31 fixes the coil 1 through the pad 4. The limiting protrusion 42 can limit the radial displacement of the coil 1, thereby improving the stability of the coil 1 during operation. At the same time, the pressure block 5 abuts against the outer side of the core column 21 of the iron core 2, and the bracket 32 ​​is used to press the pressure block 5, so that the pressure block 5 can clamp the iron core 2, thereby improving the stability of the iron core 2 during operation. In this way, it is beneficial to improve the stability of the transformer body structure 100, so that the transformer can adapt to the working environment with long-term vibration, and avoid the transformer body structure 100 from shifting or loosening due to vibration.

[0029] In one embodiment of this utility model, please refer to Figures 5 to 7 The pad 4 includes a skirt 43, and the main body 41 includes side walls. The side walls include a first side wall 412, a second side wall, a third side wall 413, and a fourth side wall. The first side wall 412 faces the yoke 22, the second side wall is opposite to the first side wall 412, and the third and fourth side walls are opposite to each other. The skirt 43 protrudes from the second, third, and fourth side walls. The skirt 43 is a horizontally extending strip structure. This arrangement ensures that each side wall except the first side wall 412 has a protruding skirt 43. The skirt 43 increases the creepage distance between the high-voltage lead-out terminal and the clamp 3, thereby improving the insulation performance of the pad 4. This solves the discharge problem between the high-voltage lead-out terminal and the clamp 3 without increasing the height of the pad 4 or the core column 21, which helps reduce the production cost of the transformer. It should be noted that, in this embodiment, since the first sidewall 412 faces the yoke 22, the current leaking from the high-voltage lead-out terminal travels a farther distance to the first sidewall 412 compared to the second sidewall, the third sidewall 413 and the fourth sidewall. Therefore, it is not necessary to provide a skirt 43 in the first sidewall 412.

[0030] Furthermore, in one embodiment of this utility model, please refer to... Figure 5 The number of umbrella skirts 43 is multiple, arranged parallel to each other along the extension direction of the core column 21. This arrangement creates a wavy structure in the vertical direction along the second to fourth side walls, where the wavy structure is formed by the cross-sections of the multiple umbrella skirts 43 on the cross-section of the pad block 4. This further increases the creepage distance of the high-voltage coil 1, thereby further reducing the probability of discharge from the high-voltage lead terminal to the clamp 3.

[0031] In one embodiment of this utility model, a support base 414 is formed on the side of the main body 41 near the clamping component 31. The side of the support base 414 away from the support surface 411 abuts against the clamping component 31. Horizontally, the support base 414 protrudes from the second sidewall, the third sidewall 413, and the fourth sidewall. This support base 414 abuts against the clamping component 31, thereby increasing the contact area between the main body 41 and the clamping component 31, and improving the stability of the pad 4 after installation. This arrangement helps to further improve the stability of the transformer in a vibration environment and prevents the coil 1 from shifting or loosening.

[0032] In one embodiment of this utility model, please refer to Figure 5 The support surface 411 includes a first support surface 4111 and a second support surface 4112, and the limiting protrusion 42 includes a first protrusion 421 and a second protrusion 422. The first support surface 4111 abuts against the low-voltage winding 12, the first protrusion 421 is in contact with the side wall of the low-voltage winding 12 facing the high-voltage winding 11, the second support surface 4112 abuts against the high-voltage winding 11, and the second protrusion 422 is in contact with the side wall of the high-voltage winding 11 facing the low-voltage winding 12. In this embodiment, both the first protrusion 421 and the second protrusion 422 are arc-shaped structures. The curvature of the first protrusion 421 is the same as that of the low-voltage winding 12, so that the first protrusion 421 can fit against the side wall of the low-voltage winding 12 facing the high-voltage winding 11, thereby increasing the contact area between the pad 4 and the low-voltage winding 12. Similarly, the curvature of the second protrusion 422 is the same as that of the high-voltage winding 11, so that the second protrusion 422 can fit against the side wall of the high-voltage winding 11 facing the low-voltage winding 12, thereby increasing the contact area between the pad 4 and the high-voltage winding 11. In this way, the limiting effect of the pad 4 on the coil 1 can be further improved, preventing the coil 1 from shifting.

[0033] In another embodiment, rubber pads are fitted onto both the first support surface 4111 and the second support surface 4112 to provide a buffering effect between the main body 41 and the coil 1. The rubber pads also possess a certain degree of elasticity, providing uniform and continuous support to the coil 1. This support not only effectively disperses the vibration energy generated by the coil 1 during operation, reducing noise caused by mechanical vibration, but also avoids wear that may occur between the coil 1 and the main body 41 due to direct contact, extending the service life of the transformer. Furthermore, the elastic properties of the rubber pads can absorb external impacts to a certain extent, enhancing the transformer's shock resistance and ensuring that the coil 1 maintains a stable operating state even in complex and variable working environments, thereby improving the overall operational reliability and stability of the transformer.

[0034] Further, please refer to Figure 5 and Figure 6In one embodiment of this utility model, the main body 41 is further provided with a limiting groove 415, which is located between the first protrusion 421 and the second protrusion 422. The coil 1 also includes an insulating cylinder installed between the low-voltage winding 12 and the high-voltage winding 11, with the end of the insulating cylinder extending into the limiting groove 415. The limiting groove 415 provided in the main body 41 not only plays a role in precisely positioning the insulating cylinder in terms of structure, but also further enhances the stability of the coil 1. When the end of the insulating cylinder extends into the limiting groove 415, it can effectively prevent the insulating cylinder from shifting due to vibration or other external forces during operation. At the same time, the limiting groove 415, the first protrusion 421, and the second protrusion 422 cooperate with each other to further prevent the overall coil 1 from shifting during operation. In addition, the insulating cylinder has a certain insulation performance, which can isolate the electric field between the low-voltage winding 12 and the high-voltage winding 11, avoiding safety accidents caused by electric field breakdown.

[0035] Please refer to the figure in one embodiment of this utility model. Figure 8 and Figure 9 The clamping groove 51 of the pressure block 5 includes multiple contact surfaces 511, which are distributed in a multi-level stepped shape. The side of the core column 21 facing the support 32 includes multiple raised surfaces, which are in contact with the contact surfaces 511. The cross-section of the core column 21 is a multi-level stepped structure, which makes the cross-section of the core column 21 approximately circular, thus facilitating more complete filling of the circular space inside the coil 1 and increasing the effective magnetic conductive area. Therefore, in order to increase the contact area between the pressure block 5 and the core column 21, the clamping groove 51 is provided with multiple contact surfaces 511 distributed in a stepped shape, so that the contact surfaces 511 fit and abut against the raised surfaces of the core column 21, thereby improving the clamping stability of the pressure block 5 on the core column 21. In actual operation, this stepped distribution of contact surfaces 511 can more accurately match the different heights and shapes of the raised surfaces of the core column 21, effectively avoiding the problem of local stress concentration that may occur due to single-plane contact. When the clamping block 5 applies clamping force to the core column 21, the stepped contact surfaces 511 can evenly distribute the force to different parts of the core column 21, making the clamping force on the core column 21 more balanced and reducing the shaking or displacement of the core column 21 caused by uneven force. At the same time, this design also enhances the friction between the clamping block 5 and the core column 21, further improving the reliability of clamping, thereby further reducing the probability of the core 2 displacing due to vibration.

[0036] In one embodiment of this utility model, both the pad 4 and the pressure block 5 are integrally molded parts. Both the pad 4 and the pressure block 5 are integrally injection molded from insulating materials (such as polyethylene, modified rubber, etc.). This integral injection molding method makes the surfaces of the pad 4 and the pressure block 5 smooth and seamless, effectively avoiding leakage or creepage that may occur due to gaps, thus improving their safety in electrical applications. At the same time, this process also gives the pad 4 and the pressure block 5 high mechanical strength, enabling them to withstand certain external impacts without easily being damaged, thereby extending their service life.

[0037] This utility model also proposes a dry-type transformer, which includes a transformer body structure 100. The specific structure of the transformer body structure 100 is as described in the above embodiments. Since this dry-type transformer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The dry-type transformer also includes a transformer housing, in which the transformer body structure 100 is housed.

[0038] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A vessel body structure, characterized in that, include: A coil, comprising a high-voltage winding and a low-voltage winding, wherein an insulation gap exists between the high-voltage winding and the low-voltage winding; The iron core includes a core column and an iron yoke, and the coil is sleeved on the core column; Two sets of clamps are respectively installed at both ends of the coil. Each clamp includes two clamping sub-components and two brackets. The two clamping sub-components are arranged opposite each other and clamp the iron yoke. The brackets are installed between the two clamping sub-components and form a clamping gap with the core column. The pad includes a main body and a limiting protrusion. One side of the main body abuts against the clamping sub-component, and the other side of the main body is provided with a support surface. The limiting protrusion protrudes from the support surface, and the support surface abuts against the high-voltage winding and the low-voltage winding. The limiting protrusion extends into the insulation gap and fits against the opposing sidewalls of the high-voltage winding and the low-voltage winding. A pressure block is inserted into the clamping gap. A clamping groove is formed on one side of the pressure block, which abuts against the core column. The other side of the pressure block abuts against the bracket.

2. The vessel body structure as described in claim 1, characterized in that, The pad includes a skirt, the main body includes a side panel, the side panel includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall is disposed facing the yoke, the second side wall is disposed opposite to the first side wall, the third side wall and the fourth side wall are disposed opposite to each other, and the skirt protrudes from the second side wall, the third side wall and the fourth side wall.

3. The vessel body structure as described in claim 2, characterized in that, The umbrella skirt is a horizontally extending strip structure.

4. The vessel body structure as described in claim 3, characterized in that, The umbrella skirts are multiple in number and are arranged in parallel along the extension direction of the central column.

5. The vessel body structure as described in claim 2, characterized in that, A support base is formed on the side of the main body near the clamping component. The side of the support base away from the support surface abuts against the clamping component. In the horizontal direction, the support base protrudes from the second side wall, the third side wall, and the fourth side wall.

6. The vessel body structure as described in claim 1, characterized in that, The support surface includes a first support surface and a second support surface, and the limiting protrusion includes a first protrusion and a second protrusion. The first support surface abuts against the low-voltage winding, and the first protrusion is in contact with the side wall of the low-voltage winding facing the high-voltage winding. The second support surface abuts against the high-voltage winding, and the second protrusion is in contact with the side wall of the high-voltage winding facing the low-voltage winding.

7. The vessel body structure as described in claim 6, characterized in that, The main body also has a limiting groove, which is located between the first protrusion and the second protrusion. The coil also includes an insulating cylinder installed between the low-voltage winding and the high-voltage winding, with the end of the insulating cylinder extending into the limiting groove.

8. The vessel body structure as described in claim 1, characterized in that, The clamping groove includes multiple mating surfaces, which are distributed in a multi-level stepped shape. The side of the core column facing the support includes multiple protruding surfaces, which are mated with the mating surfaces.

9. The vessel body structure as described in any one of claims 1 to 8, characterized in that, Both the pad and the pressure block are integrally molded parts.

10. A dry-type transformer, characterized in that, Includes the body structure as described in any one of claims 1 to 9.

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