Core structure of dry-type transformer

Abstract

The application discloses a core structure of a dry-type transformer, relates to the technical field of transformer cores, and improves defects caused by a small magnetic block splicing type magnetic core, and comprises upper and lower magnetic cores which are spliced with each other to form a closed magnetic circuit; a fixed support frame which comprises an upper pressing plate covering the top of the upper magnetic core, a lower pressing plate located at the bottom of the lower magnetic core and a tensioning assembly, and the upper and lower magnetic cores are fixed between the upper and lower pressing plates as a whole by the tensioning assembly; wherein the tensioning assembly comprises two symmetrical tensioning sheets, the upper and lower magnetic cores are limited between the two tensioning sheets, and the two ends of the tensioning sheets are fixed in locked connection with the upper and lower pressing plates respectively, so that the upper and lower magnetic cores are pressed between the upper and lower pressing plates. The application solves the problems that the traditional splicing of multiple small magnetic blocks has extremely high process requirements and is difficult to manufacture.

Description

Technical Field

[0001] This application relates to the field of transformer core technology, and in particular to a core structure for a dry-type transformer. Background Technology

[0002] High-capacity, high-frequency, high-voltage dry-type transformers typically use ferrite cores. Due to the high capacity requirements, the ferrite cores also need to be very large in size and weight. Currently, the common practice is to splice together multiple small magnetic blocks, encased in an aluminum plate or steel strip to form a single unit. The ferrite blocks are located inside the aluminum plate or steel strip, forming a closed magnetic circuit. The aluminum plate or steel strip is then connected to a bottom mounting plate. The transformer coils are then fitted over the aluminum plate or steel strip, with spacers used for support and fixation, forming a complete transformer core.

[0003] This structure solves the installation and fixation of large ferrite cores, but it also brings some objective drawbacks: First, the ferrite core is wrapped inside an aluminum plate or steel strip, preventing it from directly contacting the air and hindering heat dissipation, resulting in generally high core temperatures; second, the splicing method for ferrite cores requires extremely precise dimensions for each small magnetic block, placing high demands on the manufacturing process and making it very difficult to produce; third, the splicing of multiple magnetic blocks results in more gaps inside the core, and the high-frequency vibration during operation increases the noise of the transformer; finally, the method of wrapping the core with an aluminum plate is not only time-consuming and labor-intensive to install, but the use of large areas of aluminum plates also leads to high material costs. Utility Model Content

[0004] To improve the defects caused by the spliced ​​magnetic core, this application provides a core structure for a dry-type transformer.

[0005] This application provides a core structure for a dry-type transformer, employing the following technical solution:

[0006] A core structure for a dry-type transformer includes: an upper magnetic core and a lower magnetic core that are spliced ​​together to form a closed magnetic circuit; a fixed support frame including an upper pressure plate covering the top of the upper magnetic core, a lower pressure plate located at the bottom of the lower magnetic core, and a tensioning assembly, wherein the upper magnetic core and the lower magnetic core are integrally fixed between the upper pressure plate and the lower pressure plate in the tensioning assembly; wherein the tensioning assembly includes two symmetrical tensioning plates, the upper magnetic core and the lower magnetic core are limited between the two tensioning plates, and the two ends of the tensioning plates are respectively locked and fixed to the upper pressure plate and the lower pressure plate, so that the upper magnetic core and the lower magnetic core are pressed between the upper pressure plate and the lower pressure plate.

[0007] By adopting the above technical solution, a closed magnetic circuit is formed by splicing the upper and lower magnetic cores, which meets the requirements of the transformer for the magnetic circuit. A fixed support frame is used to fix the upper and lower magnetic cores as a whole using upper pressure plates, lower pressure plates and tensioning components. This avoids the problems of high process requirements and difficult manufacturing caused by splicing multiple small magnetic blocks in the traditional method. At the same time, it eliminates the need to wrap the magnetic core with a large area of ​​aluminum plate or steel strip, reducing the gaps inside the magnetic core, reducing the noise during transformer operation, and making the installation relatively simple, reducing material and installation costs. Furthermore, the fact that the magnetic core is not completely wrapped is conducive to heat dissipation through contact with air, thus reducing the temperature of the magnetic core.

[0008] Optionally, the tensioning plate includes a vertically arranged intermediate connecting body and locking plates vertically fixed to the upper and lower ends of the intermediate connecting body. The locking plates have locking holes for bolts to pass through, and there is an adjustment gap between the locking plates and the upper and lower pressure plates.

[0009] By adopting the above technical solution, the tensioning plate adopts a vertically set middle connecting body and a locking plate structure that is vertically fixed at its upper and lower ends. The locking plate has a locking hole for bolts to pass through and lock and fix it to the upper pressure plate and the lower pressure plate. The structure is simple and the connection is stable. An adjustment gap is left between the locking plate and the upper and lower pressure plates, which makes it convenient to make fine adjustments by bolts according to the actual situation during the installation process, which is conducive to assembling magnetic cores of different heights.

[0010] Optionally, a reinforcing rib is fixed between the locking plate and the intermediate connecting body.

[0011] By adopting the above technical solution, a reinforcing rib is fixed between the locking plate and the intermediate connecting body, which enhances the structural strength of the tensioning plate, making it less prone to deformation when subjected to tension force, ensuring the fixing effect of the tensioning assembly on the upper and lower magnetic cores, and improving the stability of the entire core structure.

[0012] Optionally, the fixed support frame further includes at least two sets of support plates, which are fixed to the lower pressure plate; the two sets of support plates are symmetrically distributed and together with the two tensioning plates enclose the upper magnetic core and the lower magnetic core.

[0013] By adopting the above technical solution, the fixed support frame is equipped with at least two sets of support plates fixed on the lower pressure plate, and the two sets of support plates are symmetrically distributed. Together with the two tensioning plates, they enclose the upper and lower magnetic cores, which further enhances the fixing and support of the magnetic core, making the magnetic core more stable during transformer operation and reducing the noise and damage risk caused by vibration.

[0014] Optionally, the support plate is fixed with a limiting post for inserting the coil into the gap between the coil and the magnetic core, so that the coil is centered on the magnetic core.

[0015] By adopting the above technical solution, the limiting stakes that are fixedly inserted into the gap between the coil and the magnetic core on the support plate can ensure that the coil is installed in the center on the magnetic core, thus ensuring the accurate relative position between the coil and the magnetic core, improving the electrical performance of the transformer, and avoiding problems such as uneven magnetic field distribution caused by coil offset.

[0016] Optionally, the limiting stake is provided with a guide ramp.

[0017] By adopting the above technical solution, a guide slope is opened on the limiting pile. When installing the coil, the guide slope can play a guiding role, making it easier and more accurate to fit the coil onto the magnetic core, which facilitates the installation operation and improves the installation efficiency.

[0018] Optionally, the support plate is provided with a clearance opening.

[0019] By adopting the above technical solution, a clearance opening is made on the support plate, which reduces the weight of the support plate and lowers the material cost while still satisfying the function of the support plate in fixing and supporting the magnetic core. It also facilitates the wiring and installation of other components inside the transformer.

[0020] Optionally, both the upper and lower pressure plates are provided with heat dissipation vents.

[0021] By adopting the above technical solution, heat dissipation vents are opened on both the upper and lower pressure plates, which increases the contact area between the core structure and the air, facilitates air circulation, further improves heat dissipation efficiency, effectively reduces the temperature of the magnetic core and the entire transformer, and extends the service life of the transformer.

[0022] Optionally, the upper pressure plate is provided with an installation port for installing the temperature measuring element.

[0023] By adopting the above technical solution, an installation port for installing temperature measuring components is set on the upper pressure plate, which facilitates the installation of temperature measuring components, enables real-time monitoring of the core temperature, facilitates timely detection of temperature abnormalities and the taking of corresponding measures, and ensures the safe operation of the transformer.

[0024] In summary, this application includes at least one of the following beneficial effects:

[0025] 1. The upper and lower magnetic cores are spliced ​​together to form a closed magnetic circuit, which changes the traditional method of splicing multiple small magnetic blocks. This reduces the dimensional accuracy requirements of each small magnetic block, simplifies the process, greatly reduces the manufacturing difficulty, and thus reduces the manufacturing cost.

[0026] 2. The traditional method of wrapping the magnetic core with large aluminum plates or steel strips has been abandoned, reducing the amount of materials used and lowering material costs; at the same time, the new fixed support structure is relatively easy to install, saving installation time and manpower, and reducing installation costs.

[0027] 3. The upper and lower pressure plates have heat dissipation vents, which increases the contact area between the core structure and the air, which is conducive to air circulation, improves heat dissipation efficiency, effectively reduces the temperature of the magnetic core and the entire transformer, and extends the service life of the transformer.

[0028] 4. An adjustment gap is left between the tensioning plate and the upper and lower pressure plates, which facilitates fine adjustment by long bolts during installation and is beneficial for assembling magnetic cores of different heights; the guide slope on the limit stake plays a guiding role when installing the coil, making it easier and more accurate to fit the coil into the magnetic core, thus improving installation efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0030] Figure 2 This is a schematic diagram illustrating the connection between the upper and lower magnetic cores in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the upper pressure plate in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the structure of the lower pressure plate in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the tensioning piece in the embodiments of this application;

[0034] Figure 6 This is a front view of an embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the support plate in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Install the magnetic core;

[0038] 2. Lower magnetic core;

[0039] 3. Fixed support frame; 31. Upper pressure plate; 311. Mounting port; 32. Lower pressure plate; 33. Tensioner plate; 331. Intermediate connector; 332. Locking plate; 333. Locking hole; 334. Reinforcing rib; 34. Support plate; 341. Limiting post; 342. Guide slope; 343. Clearance opening;

[0040] 4. Coil. Detailed Implementation

[0041] The present application will be further described in detail below with reference to the accompanying drawings.

[0042] This application discloses a core structure for a dry-type transformer. (Refer to...) Figure 1 ,2 The core structure includes an upper magnetic core 1, a lower magnetic core 2, and a fixed support frame 3. The upper magnetic core 1 and lower magnetic core 2 are U-shaped or C-shaped, and are joined together to form a closed magnetic circuit. The fixed support frame 3 is used to fix and support the upper magnetic core 1 and lower magnetic core 2. The structure of the upper magnetic core 1, lower magnetic core 2, and fixed support frame 3 abandons the traditional method of splicing multiple small magnetic blocks and wrapping them with large-area aluminum plates or steel strips, effectively solving the problems of high process requirements, high manufacturing difficulty, poor heat dissipation, high noise, and high cost associated with traditional structures.

[0043] Reference Figure 2 The fixed support frame 3 includes an upper pressure plate 31 covering the top of the upper magnetic core 1, a lower pressure plate 32 located at the bottom of the lower magnetic core 2, and a tensioning assembly. The tensioning assembly is used to fix the upper magnetic core 1 and the lower magnetic core 2 together between the upper pressure plate 31 and the lower pressure plate 32.

[0044] Reference Figure 3 , 4 To further improve heat dissipation efficiency, both the upper pressure plate 31 and the lower pressure plate 32 are provided with heat dissipation vents. The shape of the heat dissipation vents can be designed as circular, square, or rectangular, etc., according to actual needs. For example, in this embodiment, the heat dissipation vents are designed as rectangular. These heat dissipation vents increase the contact area between the core structure and the air, which is conducive to air circulation and can dissipate the heat generated by the magnetic core during operation in a timely manner, effectively reducing the temperature of the magnetic core and the entire transformer, and extending the service life of the transformer.

[0045] Reference Figure 3 In addition, the upper pressure plate 31 is provided with a mounting port 311 for mounting a temperature measuring element. The temperature measuring element can be a temperature sensor such as a thermocouple or a resistance temperature detector (RTD). It is fixed to the upper pressure plate 31 through the mounting port 311, enabling real-time monitoring of the magnetic core temperature. The lower pressure plate 32 has mounting holes for connecting and locking with an external mounting bracket.

[0046] Reference Figure 5 , 6 The tensioning assembly includes two symmetrical tensioning plates 33. Each tensioning plate 33 consists of a vertically arranged intermediate connecting body 331 and locking plates 332 vertically fixed to the upper and lower ends of the intermediate connecting body 331. The intermediate connecting body 331 has a rectangular frame structure. The locking plates 332 have locking holes 333 for bolts to pass through. The locking plates 332 are locked and fixed to the upper pressure plate 31 and the lower pressure plate 32 respectively by bolts, thereby pressing the upper magnetic core 1 and the lower magnetic core 2 between the upper pressure plate 31 and the lower pressure plate 32. The tensioning plate 33 can be made of 304 stainless steel. The intermediate connecting body 331 of the tensioning plate 33 is attached to the surface of the magnetic core and passes through the inside of the coil 4 to tension the upper and lower pressure plates, thereby fixing the entire magnetic core.

[0047] Reference Figure 5To enhance the structural strength of the tensioning plate 33, a reinforcing rib 334 is fixed between the locking plate 332 and the intermediate connecting body 331. The reinforcing rib 334 can be triangular or trapezoidal in shape and can be welded to the locking plate 332 and the intermediate connecting body 331 or integrally formed. In this embodiment, the reinforcing rib 334 is triangular. After adding the reinforcing rib 334, the stress distribution of the tensioning plate 33 under tension is more uniform, effectively preventing the tensioning plate 33 from deforming under tension, ensuring the fixing effect of the tensioning assembly on the upper and lower magnetic cores, and improving the stability of the entire core structure.

[0048] Reference Figure 5 , 6 An adjustment gap is provided between the locking plate 332 and the upper pressure plate 31 and the lower pressure plate 32. In actual installation, the locking plate 332 is attached to the lower pressure plate 32 and directly locked by bolts and nuts. The upper pressure plate 31 and the locking plate 332 are locked by a long bolt passing through the lock hole 333 and locking with a nut. The adjustment gap between the upper pressure plate 31 and the locking plate 332 can facilitate the assembly of magnetic cores of different heights.

[0049] Reference Figure 2 The fixed support frame 3 also includes two sets of support plates 34, which are fixed to the lower pressure plate 32 by bolts. The two sets of support plates 34 are symmetrically distributed and together with the two tensioning plates 33, they enclose the upper magnetic core 1 and the lower magnetic core 2, further enhancing the fixing and support of the magnetic core.

[0050] Reference Figure 6 , 7 The support plate 34 is fixed with a limiting post 341 that is inserted into the gap between the coil 4 and the magnetic core. The function of the limiting post 341 is to ensure that the coil 4 is centered on the magnetic core, so as to ensure the accurate relative position between the coil 4 and the magnetic core, improve the electrical performance of the transformer, and avoid problems such as uneven magnetic field distribution caused by the offset of the coil 4.

[0051] Reference Figure 7 To facilitate the insertion of the limiting stake 341 into the gap between the coil 4 and the magnetic core, a guide slope 342 is provided on the limiting stake 341. When installing the coil 4, the guide slope 342 can act as a guide, making it easier and more accurate for the coil 4 to be fitted onto the magnetic core, thus improving installation efficiency.

[0052] In addition, a clearance opening 343 is provided on the support plate 34. In this embodiment, the clearance opening 343 is designed to be rectangular, which reduces the weight of the support plate 34 and lowers material costs while still fulfilling the function of the support plate 34 in fixing and supporting the magnetic core. At the same time, the clearance opening 343 also provides convenient space for the wiring and installation of other components inside the transformer, facilitating the overall design and assembly of the transformer.

[0053] In this embodiment, insulating bolts and insulating nuts are used as locking components to lock and fix the various parts together.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A core structure for a dry-type transformer, characterized in that: include: The upper magnetic core (1) and the lower magnetic core (2) are spliced ​​together to form a closed magnetic circuit. The fixed support frame (3) includes an upper pressure plate (31) covering the top of the upper magnetic core (1), a lower pressure plate (32) located at the bottom of the lower magnetic core (2), and a tensioning assembly. The upper magnetic core (1) and the lower magnetic core (2) are fixed together between the upper pressure plate (31) and the lower pressure plate (32) in the tensioning assembly. The tensioning assembly includes two symmetrical tensioning plates (33), with the upper magnetic core (1) and the lower magnetic core (2) positioned between the two tensioning plates (33). The two ends of the tensioning plates (33) are locked and fixed to the upper pressure plate (31) and the lower pressure plate (32) respectively, so that the upper magnetic core (1) and the lower magnetic core (2) are pressed between the upper pressure plate (31) and the lower pressure plate (32).

2. The core structure of a dry-type transformer according to claim 1, characterized in that: The tensioning plate (33) includes a vertically arranged intermediate connecting body (331) and locking plates (332) vertically fixed at the upper and lower ends of the intermediate connecting body (331). The locking plates (332) have locking holes (333) for bolts to pass through. There is an adjustment gap between the locking plates (332) and the upper pressure plate (31) and the lower pressure plate (32).

3. The core structure of a dry-type transformer according to claim 2, characterized in that: A reinforcing rib (334) is fixed between the locking plate (332) and the intermediate connecting body (331).

4. The core structure of a dry-type transformer according to claim 1, characterized in that: The fixed support frame (3) also includes at least two sets of support plates (34), which are fixed on the lower pressure plate (32). The two sets of support plates (34) are symmetrically distributed and together with the two tensioning plates (33) enclose the upper magnetic core (1) and the lower magnetic core (2).

5. The core structure of a dry-type transformer according to claim 4, characterized in that: The support plate (34) is fixed with a limiting post (341) for inserting the coil (4) into the gap between the magnetic core, so that the coil (4) is installed in the center on the magnetic core.

6. The core structure of a dry-type transformer according to claim 5, characterized in that: The limiting stake (341) is provided with a guide slope (342).

7. The core structure of a dry-type transformer according to claim 4, characterized in that: The support plate (34) has a clearance opening (343).

8. The core structure of a dry-type transformer according to claim 1, characterized in that: Both the upper pressure plate (31) and the lower pressure plate (32) are provided with heat dissipation vents.

9. The core structure of a dry-type transformer according to claim 1, characterized in that: The upper pressure plate (31) is provided with an installation port (311) for installing the temperature measuring element.

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