A multi-layer concentric winding structure of a transformer

Abstract

The utility model relates to transformer winding technical field especially a kind of transformer multilayer concentric winding structure, including by inside and outside sequentially coaxial center and interval setting first center iron core, second insulation unit, third insulation unit, the bottom of the first center iron core, the second insulation unit, the third insulation unit is all fixed in the top of insulating base, on the outer lateral wall of the first center iron core, on the outer lateral wall of the second insulation unit, on the outer lateral wall of the third insulation unit respectively tightly wound with first winding, second winding, third winding, the inner insulation cavity between the first center iron core with the second insulation unit, the outer insulation cavity between the second insulation unit with the third insulation unit is formed. This patent realizes reliable electrical isolation between each winding by multilayer concentric winding structure and the double insulation cavity design of inner insulation cavity, outer insulation cavity, improves the security and insulation reliability of transformer operation.

Description

Technical Field

[0001] This utility model relates to the field of transformer winding technology, and in particular to a multi-layer concentric winding structure for a transformer. Background Technology

[0002] As the core circuit component of a transformer, the performance of the transformer winding directly affects the overall efficiency of the transformer. Traditional transformer windings mostly use round metal wires. A search revealed a low-voltage coil with a foil-type series structure disclosed in patent application number CN202422772467.X. This coil mainly consists of multiple foil-type sub-coils connected in series with an intermediate copper busbar. The sub-coils include a first output terminal coil, a second output terminal coil, and an intermediate sub-coil, all of which are foil-type coils.

[0003] However, in actual use, the structure of the aforementioned low-voltage coil will have the following structural problems: First, there is a problem with low winding fill rate, large gaps between each turn of conductor, and insufficient compaction of each layer of conductor, resulting in weak mechanical strength. In particular, the welding joints between the copper busbar and the foil strip are prone to insulation damage due to welding process problems or factors such as thermal expansion and contraction and electromagnetic vibration during operation, leading to insulation faults such as partial discharge.

[0004] Secondly, the sub-coils are connected by copper busbars. When subjected to the strong electrodynamic force generated by short-circuit current or the mechanical external force during transportation and installation, the connection is prone to loosening, which in turn affects the mechanical stability of the entire coil.

[0005] Due to the performance defects of traditional windings and the limitations of existing patented improvement schemes, there is an urgent need for a new winding structure that is mechanically enhanced and makes efficient use of space in practical applications. Utility Model Content

[0006] To solve one of the aforementioned technical problems, the present invention provides a multi-layer concentric winding structure for a transformer, comprising a first central core, a second insulating unit, and a third insulating unit arranged coaxially and at intervals from the inside out. The bottoms of the first central core, the second insulating unit, and the third insulating unit are all fixed to the top of an insulating base. A first winding, a second winding, and a third winding are tightly wound on the outer walls of the first central core, the second insulating unit, and the third insulating unit, respectively. The top of the second insulating unit is screwed and fixed to the top of the first central core. An inner insulating cavity is formed between the first central core and the second insulating unit, and an outer insulating cavity is formed between the second insulating unit and the third insulating unit.

[0007] In any of the above embodiments, it is preferred that the first central iron core includes an iron core body, the bottom of which is fixed to the top of the insulating base, an external threaded section is integrally formed at the top center of the iron core body, a thread is provided on the surface of the external threaded section, a top shaft section is integrally formed at the top center of the external threaded section, the external threaded section is threaded with the top center of the second insulating unit, and the first winding is tightly wound on the outer side wall of the iron core body.

[0008] In any of the above embodiments, the second insulating unit preferably includes a second insulating cylinder that is vertically arranged and spaced around the periphery of the iron core body. The top of the second insulating cylinder is sealed and the center is sleeved on the outer side wall of the top shaft section. An internally threaded tube that mates with the externally threaded section is integrally formed at the bottom center of the top cover of the second insulating cylinder. The bottom of the second insulating cylinder abuts against the insulating base. The second winding is tightly wound on the outer side wall of the second insulating cylinder.

[0009] In any of the above embodiments, it is preferred that the third insulating unit includes a third insulating cylinder that is vertically arranged and spaced around the periphery of the second insulating cylinder, the top of the third insulating cylinder is sealed and a central hole that mates with the top shaft section is provided in the center, the bottom of the third insulating cylinder is fixed to the top of the insulating base by a flange, and a third winding is tightly wound on the outer side wall of the third insulating cylinder.

[0010] In any of the above embodiments, it is preferred that the insulating base is fixedly installed at the bottom of the U-shaped cavity of a U-shaped frame, and a cover is fixedly installed at the top of the U-shaped frame, the center of the cover being fitted onto the top of the first central iron core.

[0011] In any of the above embodiments, it is preferred that an annular inner insulating cavity is formed between the iron core body and the second insulating cylinder.

[0012] In any of the above embodiments, it is preferred that the second insulating cylinder and the third insulating cylinder form an annular outer insulating cavity.

[0013] In any of the above embodiments, it is preferred that the top center of the cap is movably sleeved on the outer side wall of the top shaft section and the bottom of the cap abuts against the top of the third insulating cylinder.

[0014] In any of the above embodiments, it is preferred that the insulating base is hollow inside and has a number of heat dissipation holes on its surface.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This patent achieves reliable electrical isolation between windings through a multi-layer concentric winding structure and a double insulation cavity design with inner and outer insulation cavities, effectively preventing potential difference breakdown and improving the safety and insulation reliability of transformer operation.

[0016] 2. The U-shaped frame, cover and insulating base of this patent form a rigid support system, and through detachable structures such as threaded connection and flange fixation, it not only enhances the overall mechanical stability, but also facilitates the disassembly and maintenance of winding components, and improves assembly efficiency and maintenance convenience.

[0017] 3. This patent, through the design of hollow heat dissipation holes in the insulating base, potential heat dissipation channels in the multi-layer insulating cavity, and the installation foundation for heat dissipation fins on the outer wall of the third insulating cylinder, forms a passive convection + active heat dissipation structure, which improves the heat dissipation efficiency of the transformer under high load conditions and extends the service life of the equipment. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal cross-sectional structure of Embodiment 1 of this utility model.

[0021] Figure 3 This is a schematic diagram of the internal cross-sectional structure of Embodiment 2 of this utility model.

[0022] In the diagram, 1. Insulating base; 2. First winding; 3. Second winding; 4. Third winding; 5. U-shaped frame; 6. Cover; 7. Iron core body; 8. External threaded section; 9. Top shaft section; 10. Second insulating cylinder; 11. Internal threaded tube; 12. Third insulating cylinder; 13. Flange; 14. Inner insulating cavity; 15. Outer insulating cavity; 16. Heat dissipation hole. Detailed Implementation

[0023] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-3 As shown in the image.

[0024] Example 1: A multi-layer concentric winding structure for a transformer includes a first central core, a second insulating unit, and a third insulating unit arranged coaxially and at intervals from the inside out. The bottoms of the first central core, the second insulating unit, and the third insulating unit are all fixed to the top of an insulating base 1. A first winding 2, a second winding 3, and a third winding 4 are tightly wound on the outer side walls of the first central core, the second insulating unit, and the third insulating unit, respectively. The top of the second insulating unit is screwed and fixed to the top of the first central core. An inner insulating cavity 14 is formed between the first central core and the second insulating unit, and an outer insulating cavity 15 is formed between the second insulating unit and the third insulating unit.

[0025] With the first central iron core as the core of the magnetic circuit, the first winding 2, the second winding 3, and the third winding 4 are respectively wound around the outer walls of the first central iron core, the second insulating unit, and the third insulating unit, and energy is transferred by means of electromagnetic induction. The second insulating unit is fixed to the first central iron core by screwing on the top to form an inner insulating cavity 14, and an outer insulating cavity 15 is formed between the second insulating unit and the third insulating unit. Electrical isolation between the windings is achieved by setting up the insulating units and the insulating cavities.

[0026] This multi-layer concentric winding structure improves space utilization and enhances electromagnetic coupling efficiency; the setting of the second and third insulation units ensures electrical isolation and insulation performance between adjacent windings, improving the safety of the transformer and reducing short-circuit risk; the coaxial and spaced layout facilitates the winding and assembly of each winding, resulting in a compact structure.

[0027] The first central iron core provides the magnetic conduction path, and the first winding 2, the second winding 3, and the third winding 4 serve as primary or secondary windings to realize the conversion of electrical energy and magnetic energy. The inner insulation cavity 14 and the outer insulation cavity 15 isolate adjacent windings to prevent breakdown caused by potential difference and ensure the safe operation of the equipment.

[0028] In addition to providing electrical insulation, the inner insulation cavity 14 and the outer insulation cavity 15 can also be used as heat dissipation channels to assist in the cooling of the windings and improve the stability of the transformer under high load conditions.

[0029] In any of the above embodiments, it is preferred that the insulating base 1 is fixedly installed at the bottom of the U-shaped cavity of a U-shaped frame 5, and a cover 6 is fixedly installed on the top of the U-shaped frame 5, with the center of the cover 6 fitting into the top of the first central iron core.

[0030] The insulating base 1 is fixed to the bottom of the U-shaped cavity of the U-shaped frame 5 to form a structural support base; the U-shaped frame 5 and the cover 6 form a closed mechanical support structure, which restricts the radial and axial displacement of each component and ensures the mechanical stability of the winding structure.

[0031] The design of the U-shaped frame 5 and the cover 6 provides additional mechanical support to prevent the transformer from being damaged by vibration or external forces during operation.

[0032] In any of the above embodiments, it is preferred that the first central iron core includes an iron core body 7, the bottom of the iron core body 7 is fixed to the top of the insulating base 1, an external thread section 8 is integrally formed at the top center of the iron core body 7, a thread is provided on the surface of the external thread section 8, a top shaft section 9 is integrally formed at the top center of the external thread section 8, the external thread section 8 is threaded with the top center of the second insulating unit, and the first winding 2 is tightly wound on the outer side wall of the iron core body 7.

[0033] The core body 7, as the main part of the magnetic circuit, is tightly connected to the second insulation unit through the threaded engagement of the external threaded section 8. In addition, the hollow structure of the core body 7 reduces the amount of magnetic conductive material used, thereby reducing the overall weight and material cost.

[0034] The hollow structure directly increases the heat conduction area, making it suitable for high power density transformers.

[0035] In addition, hollow structures can absorb the vibration energy of transformers during operation by filling them with elastic materials (such as rubber and foam), thereby reducing mechanical noise and stress concentration risks.

[0036] The iron core body 7 serves as the main body of the first central iron core, providing a magnetic circuit channel; the external threaded section 8 cooperates with the internal threaded tube 11 at the top of the second insulation unit to achieve a detachable connection between the second insulation unit and the first central iron core; the top shaft section 9 provides a positioning reference for the center sleeve at the top of the second insulation unit; the first winding 2 is wound around the outer wall of the iron core body 7, generating alternating magnetic flux in the iron core body 7 through electromagnetic induction.

[0037] The threaded engagement structure of the external thread section 8 and the internal thread tube 11 facilitates disassembly and maintenance, improving assembly efficiency; the positioning function of the top shaft section 9 ensures the coaxiality of the second insulation unit and the first central iron core, avoiding magnetic field distortion caused by winding eccentricity; the integrally formed external thread section 8 and top shaft section 9 enhance structural strength and reduce stress concentration.

[0038] In any of the above embodiments, the second insulating unit includes a second insulating cylinder 10 that is vertically arranged and spaced around the periphery of the iron core body 7. The top of the second insulating cylinder 10 is sealed and the center is sleeved on the outer side wall of the top shaft section 9. An internally threaded tube 11 that mates with the externally threaded section 8 is integrally formed at the center bottom of the top cover of the second insulating cylinder 10. The bottom of the second insulating cylinder 10 abuts against the insulating base 1. The second winding 3 is tightly wound on the outer side wall of the second insulating cylinder 10.

[0039] The second insulating cylinder 10 is vertically sleeved around the core body 7 to form an annular insulating barrier; the top sealing structure is sleeved with the top shaft section 9, and the external thread section 8 is threaded to the internal thread tube 11 to fix the second insulating cylinder 10 to the first central core; the bottom is pressed against the insulating base 1 to achieve axial positioning; the second winding 3 is wound around the outer wall of the second insulating cylinder 10 and is isolated from the first winding 2 through the inner insulating cavity 14 between the second insulating cylinder 10 and the core body 7.

[0040] The closed structure of the second insulating cylinder 10 enhances the insulation performance of the inner insulating cavity 14 and prevents external impurities from entering and affecting the insulation strength; the double fixing method of the bottom abutting against the insulating base 1 and the top threaded connection improves the mechanical stability of the second insulating unit; the spaced-out layout provides a clear physical space for the inner insulating cavity 14, making it easy to control the insulation distance.

[0041] The second insulating cylinder 10 isolates the first winding 2 from the second winding 3, and the inner insulating cavity 14 provides an electrical clearance; the top sealing structure and the internal threaded tube 11 achieve mechanical connection and positioning, and the second winding 3 achieves magnetic coupling and electrical isolation through winding around the outer wall of the second insulating cylinder 10.

[0042] In any of the above embodiments, it is preferred that the third insulating unit includes a third insulating cylinder 12 that is vertically arranged and spaced around the periphery of the second insulating cylinder 10. The top of the third insulating cylinder 12 is sealed and a central hole that mates with the top shaft section 9 is provided in the center. The bottom of the third insulating cylinder 12 is fixed to the top of the insulating base 1 by a flange 13. A third winding 4 is tightly wound on the outer side wall of the third insulating cylinder 12.

[0043] The third insulating cylinder 12 is vertically sleeved around the second insulating cylinder 10 to form an outer insulating barrier; the top sealing structure is connected to the top shaft section 9 through the central hole to achieve axial positioning; the bottom is fixed to the insulating base 1 through the flange 13 to ensure the mechanical connection strength; the third winding 4 is wound around the outer wall of the third insulating cylinder 12 and is isolated from the second winding 3 through the outer insulating cavity 15.

[0044] The flange 13 fixing method facilitates the disassembly and replacement of the third insulating cylinder 12, improving maintenance convenience; the fit between the top center hole and the top shaft section 9 further ensures the coaxiality of the three windings; the spaced three-layer structure provides sufficient insulation distance for the outer insulating cavity 15, adapting to the requirements of high voltage level applications.

[0045] In addition, the third insulating cylinder 12 isolates the second winding 3 from the third winding 4, and the outer insulating cavity 15 provides an outer electrical clearance; the flange 13 and the top sealing structure respectively realize the bottom mechanical fixation and the top positioning, and the third winding 4 achieves magnetic coupling and electrical isolation by winding around the outer wall of the third insulating cylinder 12.

[0046] In any of the above embodiments, it is preferred that an annular inner insulating cavity 14 is formed between the iron core body 7 and the second insulating cylinder 10.

[0047] The iron core body 7 and the second insulating cylinder 10 are spaced together to form an annular space, namely the inner insulating cavity 14, which is filled with air or insulating medium. Through the physical separation of the insulating distance, the potential difference between the first winding 2 and the second winding 3 is prevented from breaking down.

[0048] The ring structure ensures that the insulation distance is evenly distributed in the circumference, avoiding local weak points in the insulation; the radial width of the inner insulation cavity 14 can be adjusted according to the voltage level to flexibly adapt to different insulation strength requirements.

[0049] The inner insulating cavity 14 serves as an electrical isolation space between the first winding 2 and the second winding 3. Through the dielectric properties of the insulating medium (such as air), it withstands the voltage stress between the windings and ensures equipment safety.

[0050] In any of the above embodiments, it is preferred that the second insulating cylinder 10 and the third insulating cylinder 12 form an annular outer insulating cavity 15.

[0051] The second insulating cylinder 10 and the third insulating cylinder 12 are spaced together to form an annular outer insulating cavity 15. The cavity is filled with an insulating medium to separate the second winding 3 and the third winding 4. The insulating distance and the dielectric strength of the medium prevent potential breakdown.

[0052] Together with the inner insulation cavity 14, it forms a double insulation structure, further improving the overall insulation reliability; the ring structure facilitates the concentricity control during winding and ensures a uniform magnetic field distribution.

[0053] The outer insulation cavity 15 serves as an electrical isolation space between the second winding 3 and the third winding 4, bearing the insulation requirements between windings at higher voltage levels, while also helping to maintain the coaxial layout of the three windings.

[0054] Example 2: Compared with Example 1, this example also includes the following technical features: In any of the above embodiments, it is preferred that the insulating base 1 is hollow inside and has a plurality of heat dissipation holes 16 on its surface.

[0055] The hollow interior of the insulating base 1 forms a heat dissipation channel, and the heat dissipation holes 16 on the surface are connected to the hollow cavity. The heat generated by the winding is dissipated through the heat dissipation holes 16 by air convection, thereby reducing the temperature of the equipment.

[0056] The combination of the hollow structure and the heat dissipation holes 16 enhances the heat conduction path and improves heat dissipation efficiency; no additional heat dissipation components are needed, simplifying the structural design and reducing costs.

[0057] In any of the above embodiments, it is preferred that the top center of the cover 6 is movably sleeved on the outer side wall of the top shaft section 9 and the bottom of the cover 6 abuts against the top of the third insulating cylinder 12.

[0058] The top center of the cap 6 is connected to the top shaft section 9 through a movable sleeve structure, allowing a certain degree of axial displacement compensation. The bottom abuts against the top of the third insulating cylinder 12, forming an axial limit on the third insulating cylinder 12. The movable sleeve design avoids structural stress concentration caused by thermal expansion.

[0059] The structure combining the movable sleeve and the abutment not only ensures mechanical positioning accuracy but also provides a buffer space for thermal deformation, thus improving structural reliability; it simplifies the assembly process of the cover 6 and the top shaft section 9, making disassembly and maintenance easier.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0061] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A multi-layer concentric winding structure for a transformer, characterized in that: The device comprises a first central iron core, a second insulating unit, and a third insulating unit arranged coaxially and at intervals from the inside out. The bottoms of the first central iron core, the second insulating unit, and the third insulating unit are all fixed to the top of the insulating base. A first winding, a second winding, and a third winding are tightly wound on the outer walls of the first central iron core, the second insulating unit, and the third insulating unit, respectively. The top of the second insulating unit is screwed and fixed to the top of the first central iron core. An inner insulating cavity is formed between the first central iron core and the second insulating unit, and an outer insulating cavity is formed between the second insulating unit and the third insulating unit. The first central core includes a core body, the bottom of which is fixed to the top of the insulating base. An external threaded section is integrally formed at the top center of the core body, and a thread is provided on the surface of the external threaded section. A top shaft section is integrally formed at the top center of the external threaded section. The external threaded section is threaded with the top center of the second insulating unit. The first winding is tightly wound on the outer side wall of the core body. The second insulating unit includes a second insulating cylinder that is vertically arranged and spaced around the periphery of the iron core body. The top of the second insulating cylinder is sealed and the center is sleeved on the outer side wall of the top shaft section. An internal threaded tube that mates with the external threaded section is integrally formed at the bottom center of the top cover of the second insulating cylinder. The bottom of the second insulating cylinder abuts against the insulating base. The second winding is tightly wound on the outer side wall of the second insulating cylinder. The third insulating unit includes a third insulating cylinder that is vertically arranged and spaced around the periphery of the second insulating cylinder. The top of the third insulating cylinder is sealed and a central hole that mates with the top shaft section is provided in the center. The bottom of the third insulating cylinder is fixed to the top of the insulating base by a flange. A third winding is tightly wound on the outer wall of the third insulating cylinder.

2. The transformer multi-layer concentric winding structure according to claim 1, characterized in that: The insulating base is fixedly installed at the bottom of the U-shaped cavity of a U-shaped frame, and a cover is fixedly installed on the top of the U-shaped frame. The center of the cover is fitted onto the top of the first central iron core.

3. The transformer multi-layer concentric winding structure according to claim 2, characterized in that: The iron core body and the second insulating cylinder form an annular inner insulating cavity.

4. The transformer multi-layer concentric winding structure according to claim 3, characterized in that: The second insulating cylinder and the third insulating cylinder form an annular outer insulating cavity.

5. A transformer multi-layer concentric winding structure according to claim 4, characterized in that: The top center of the cap is movably fitted onto the outer side wall of the top shaft section, and the bottom of the cap abuts against the top of the third insulating cylinder.

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