A high-frequency transformer skeleton with a special structure

Abstract

The present invention discloses a high-frequency transformer skeleton with a special structure, which is used for fixing the magnetic core and winding the low-voltage package and the high-voltage package. It includes a skeleton body, on which a winding groove is provided; and magnetic core fixing surfaces, which are designed symmetrically up and down and are provided with oil passing holes and wire passing holes. The present invention uses multiple completely identical skeletons for assembly, doubling the number of single pieces. The single-piece skeleton body is made by die-casting with an insulating material, reducing the processing cost structure. Using die processing simplifies the installation process, reduces costs, and improves economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of high-frequency high-voltage transformers, and specifically to a high-frequency transformer skeleton with a special structure. Background Art

[0002] The transformer skeleton is one of the main components of the transformer, mainly used for fixing the transformer core and winding the transformer wire package. The traditional transformer skeleton is assembled from multiple structures, with a complex structure, high processing costs, a cumbersome production process, high consumption of human resources, and high production costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-frequency transformer skeleton with a special structure, which simplifies the structure, uses multiple identical skeletons for assembly, simplifies the structure, saves installation time, and reduces the installation labor cost.

[0004] The technical solution of the present invention is as follows:

[0005] A high-frequency transformer skeleton with a special structure, characterized in that it is relatively spliced by two or more single-piece skeletons with the same structure. The single-piece skeleton is divided into an upper part, a middle part, and a lower part from top to bottom; the upper part and the lower part are symmetric up and down, and the inner side of the lower part has a core fixing surface for placing and fixing the core; the middle part is in an arched shape protruding outward for winding the secondary coil; and it further includes:

[0006] A winding groove, arranged in the middle part of the single-piece skeleton for winding the secondary coil. After assembly, there is a certain insulation distance between the winding grooves of the two single-piece skeletons;

[0007] Oil through holes, arranged on the upper side and the upper top surface of the single-piece skeleton, as well as on the lower side and the lower bottom surface, for heat dissipation and insulation of the core and the wire package;

[0008] Connection fixing holes, arranged on the inner side, outer side, lower inner side, and lower outer side of the upper part of the single-piece skeleton for splicing two single-piece skeletons pairwise.

[0009] Furthermore, it further includes: creepage grooves, arranged on the upper part and the lower part of the single-piece skeleton for high-voltage insulation.

[0010] Furthermore, it further includes: wire passing holes, arranged on the inner side of the upper part and the inner side of the lower part of the single-piece skeleton for passing the output wires of the low-voltage package; and

[0011] Fixed threaded holes, arranged at the top of the upper part of the single-piece skeleton, for passing through the fixed threaded holes to fix the skeleton package to the transformer frame.

[0012] Preferably, the single-piece skeleton is machined or molded, and the material is insulating materials such as DMC, SMC, polytetrafluoroethylene, and epoxy board.

[0013] Preferably, the width and depth of the wire winding groove are adjusted according to the wire diameter and the number of turns.

[0014] Preferably, the boss between the wire winding grooves serves as a reinforcing rib to increase the structural strength.

[0015] Preferably, the connecting holes use metal bolts or insulating bolts to fix the multi-piece skeleton body.

[0016] During the wire winding process, the skeleton is stressed, resulting in slight deformation at the edge of the wire winding groove. Therefore, a certain draft angle is designed here to compensate for the deformation size.

[0017] The two inner magnetic core fixing surfaces are used to fix the transformer magnetic core. During the mold design, it is necessary to ensure the flatness of this surface and its perpendicularity to the side.

[0018] The creepage groove is used for high-voltage insulation. When the voltage level is low, there is no need to design the creepage groove.

[0019] The top surface is designed with wire passing holes, and the structural design is reasonably utilized to meet the wiring requirements.

[0020] After the skeleton is installed, the secondary high-voltage coil is wound. After the high-voltage coil is wound, the entire skeleton package is fixed to the transformer frame through the fixing threaded holes.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1) The structure is simplified. Multiple identical skeletons are assembled, and the number of single pieces increases exponentially. The single-piece skeleton body is made by mold opening with insulating materials, reducing the processing cost. According to the embodiment calculation, the processing cost is about 1 / 10 of the original.

[0023] 2) After the skeletons are assembled, there is a certain insulation distance between the wire winding grooves of the two skeletons, meeting the insulation requirements. According to the embodiment, the insulation distance is 20 mm, avoiding the problem of partial discharge of high voltage between the same materials.

[0024] 3) During installation, the multiple skeletons can be interchanged, and the assembly is convenient. The connection between the two skeleton bodies can use metal bolts or insulating bolts, which is convenient for installation, simplifies the installation process, saves installation time, and reduces the installation labor cost. According to the embodiment calculation, the installation speed is twice that of the original, and half of the time can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the axial view of the skeleton of the present invention

[0026] Figure 2 It is an external axial view of the single-piece skeleton of the present invention

[0027] Figure 3 It is an internal axial view of the single-piece skeleton of the present invention

[0028] Figure 4 It is an assembly drawing of two skeleton bodies

[0029] Figure 5 It is a schematic diagram after assembling four single-piece skeletons

[0030] Figure 6 It is a schematic diagram of the draft angle extraction of the edge of the winding groove. Among them, a is the front view and b is the sectional view of a Specific implementation manners

[0031] The following will describe the preferred embodiments of the present invention in detail with reference to the accompanying drawings, so as to better understand the features and advantages of the present invention

[0032] Please refer to Figure 5 , Figure 5 It is a schematic diagram after assembling four single-piece skeletons. As Figure 5 shown, for the high-frequency transformer skeleton of this embodiment, four completely identical skeletons are used for assembly. Each single-piece is processed by die-casting. Using DMC molding materials, after assembly, there is a 20-mm insulation gap between the winding grooves of the two skeletons, meeting the insulation requirements. During installation, the four skeletons can be interchanged, facilitating assembly. The connection between the two skeleton bodies uses metal bolts or insulating bolts, which is convenient for installation, simplifies the installation process, saves installation time, and reduces the installation labor cost

[0033] The number and width of the winding grooves in this embodiment are designed according to an 80-kV transformer, and the creepage groove is designed with an insulation of 80 kV

[0034] There should be no draft angle on the fixed surfaces of the two internal magnetic cores in the die design. The top surfaces at the upper and lower ends, which serve as the installation surfaces of the entire skeleton, should also not have a draft angle designed. Side sliders need to be added here to ensure the perpendicularity of the magnetic core fixed surfaces and the top surfaces to the sides

[0035] To avoid deformation at the edge position of the winding groove caused by the force on the skeleton during the winding process, a draft angle a = 1° is designed at the edge position of the winding groove to compensate for the deformed dimension. The position of a is as Figure 6 shown

[0036] Two wire-passing holes for the output wires of the low-voltage package are designed on the top surface, and the wiring requirements are met by reasonably utilizing the structural design

[0037] The framework of the present invention is used to fix the magnetic core and wind the primary low-voltage coil and the secondary high-voltage coil. The primary low-voltage coil is wound around the magnetic core. During installation, first place two framework bodies horizontally with the winding grooves facing downwards, and place the low-voltage coil (including the magnetic core) in the groove formed by the framework bodies, as Figure 3 shown. Then buckle the two framework bodies onto the Figure 4 framework shown, and finally tighten and fix the 4 frameworks with fixing bolts.

[0038] After the framework is installed, wind the secondary high-voltage coil. After the high-voltage coil is wound, fix the whole assembly to the transformer framework through the fixing threaded holes.

[0039] The above are only embodiments of the present invention and do not limit the protection scope of the present invention accordingly.

Claims

1. A special structure high frequency transformer skeleton, characterized in that: The invention is formed by relatively splicing two or more monolithic frames (1) of the same structure, wherein the monolithic frame (1) is divided into an upper part, a middle part and a lower part from top to bottom; the upper part and the lower part are symmetrical, and the inner side of the lower part has a magnetic core fixing surface (8) for placing and fixing the magnetic core; the middle part is in an outwardly protruding arch shape, and is used for winding the secondary coil; and further comprises: A winding groove (2) is provided in the middle of the monolithic frame (1) and is used for winding the secondary coil. After assembly, a certain insulation distance (11) is provided between the winding grooves (2) of the two monolithic frames (1); Oil holes (4) are provided on the upper side surface and upper top surface (3) as well as the lower side surface and lower bottom surface of the monolithic skeleton (1) and are used for heat dissipation and insulation of the magnetic core and the coil; Connecting fixing holes (6) are provided on the upper inner side surface, the upper outer side surface, the lower inner side surface and the lower outer side surface of the single-piece frame (1) and are used for splicing two of the single-piece frames (1); The monolithic skeleton (1) is machined or molded, and the material is DMC, SMC, polytetrafluoroethylene or epoxy board; The width and depth of the winding groove (2) are adjusted according to the wire diameter and the number of turns.

2. The special structure high frequency transformer skeleton according to claim 1 is characterized in that: Also includes: Creepage grooves (5) are provided on the upper and lower parts of the monolithic frame (1) and are used for high-voltage insulation.

3. The special structure high frequency transformer skeleton according to claim 1 or 2, characterized in that: Also includes: Wire holes (9) are provided on the upper inner side and the lower inner side of the monolithic frame (1) for passing the low-voltage package output wire; as well as A fixing threaded hole (10) is provided on the upper top of the monolithic frame (1), through which the frame package is fixed to the transformer frame.

4. The special structure high frequency transformer bobbin according to any one of claims 1 to 3, characterized in that: The bosses between the winding grooves (2) serve as reinforcing ribs to increase structural strength.

5. The special structure high frequency transformer bobbin according to any one of claims 1 to 3, characterized in that: The connection fixing holes (6) are used to fix the multi-piece skeleton body using metal bolts or insulating bolts.

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