Capacitor core structure and multi-core capacitor

Abstract

The application provides a capacitor core structure and a multi-core capacitor, which comprises at least two core units; each of the core units comprises a capacitor core and a winding ring wound on the outer side of the capacitor core; the winding ring is made of high-temperature-resistant insulating material; at least two winding rings are wound on each capacitor core; and the adjacent capacitor cores are in abutment with each other through the winding rings to form an equidistant separation structure. The capacitor core structure can realize equidistant separation insulation of the capacitor cores, buffer impact and reduce the risk of mechanical damage.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, specifically to a capacitor core structure and a multi-core capacitor. Background Technology

[0002] The capacitor core is the core component of capacitors in power electronic equipment, and its structural state directly determines the stability and service life of the capacitor. Currently, large multi-core capacitors generally use core rods and copper strips to position the cores. Under the action of gravity, adjacent capacitor cores are tightly attached to each other, with no buffer or isolation medium between the cores.

[0003] Large capacitors have a large number of internal cores and are heavy overall, with the bottom cores bearing the greatest load. Vibrations and impacts generated during equipment operation and product transportation directly affect the closely packed cores, subjecting them to long-term mechanical stress, making them highly susceptible to damage and failure. Furthermore, traditional structures cannot precisely control the insulation spacing between adjacent cores, resulting in poor positioning and further impacting the safety and reliability of the capacitor.

[0004] Therefore, there is an urgent need to design a new structure that can reliably position the capacitor core, ensure the insulation spacing, and have buffering and shock absorption capabilities to reduce the risk of damage to the core due to mechanical stress. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the object of the present invention is to provide a capacitor core structure that enables equidistant insulation of the cores, buffering impacts and reducing the risk of mechanical damage.

[0006] To achieve the above objectives, the present invention proposes a capacitor core structure comprising at least two core units; Each of the said core units includes a capacitor core and a ring wrapped around the outside of the capacitor core. The ring is made of high-temperature resistant insulating material. Each capacitor core has at least two rings wrapped around it. Adjacent capacitor cores abut against each other through their respective rings to form an equidistant separation structure.

[0007] According to the present invention, a capacitor core structure is provided, which involves setting at least two core units, with a high-temperature resistant insulating ring wound around the outside of each core, and at least two rings arranged on a single core. Adjacent capacitor cores abut against each other by the rings, achieving equidistant spacing between the cores. This structure not only ensures accurate core positioning and stable insulation spacing through the rings, but also uses the material of the rings themselves to buffer vibration and impact, effectively reducing the probability of core damage due to mechanical stress and improving overall reliability.

[0008] In addition, the capacitor core structure proposed in the above embodiments of the present invention may also have the following additional technical features: Optionally, the multiple core units are distributed in multiple columns, and the core units in adjacent columns are arranged in an aligned or staggered manner.

[0009] Optionally, the two loops are wound around the capacitor core near both ends at intervals, with a preset distance between the loops and the side end face of the capacitor core.

[0010] Optionally, the ring is made of at least one of the following materials: silicone rubber, ordinary rubber, insulating plastic, and high-temperature resistant insulating tape.

[0011] Optionally, the spacing between two adjacent capacitor cores is equal to the sum of the thicknesses of the two rings that abut against each other on both sides.

[0012] Optionally, it also includes a housing, the inner wall of which is provided with grooves for positioning each of the core units.

[0013] To achieve the above objectives, the present invention also proposes a multi-core capacitor, which includes the capacitor core structure described above. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a multi-core capacitor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a core unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a single-row arrangement of core units according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a multi-column aligned arrangement of core units according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a multi-row staggered arrangement of core units according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: Core unit 1, capacitor core 11, gold spray layer 111, bezel 12, outer shell 2, groove 21. Detailed Implementation

[0015] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0016] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] The following is for reference. Figures 1-5 The implementation of the capacitor core structure proposed in the embodiments of the present invention will be described in detail.

[0019] According to an embodiment of the present invention, a capacitor core structure includes at least two core units 1; Each core unit 1 includes a capacitor core 11 and a retaining ring 12 wrapped around the outside of the capacitor core 11. The retaining ring 12 is made of high temperature resistant insulating material. Each capacitor core 11 has at least two retaining rings 12 wrapped around it. Adjacent capacitor cores 11 abut against each other through their respective retaining rings 12 to form an equidistant separation structure.

[0020] In other words, this capacitor core structure comprises at least two core units 1. Each core unit 1 has a capacitor core 11 wrapped with a high-temperature resistant insulating ring 12 on its outer side. Each capacitor core 11 has at least two rings 12, and this multi-point arrangement ensures uniform support stress. During actual processing, the winding thickness of the rings 12 can be flexibly adjusted according to the insulation distance requirements of adjacent cores. Simultaneously, combined with the specifications of the capacitor core 11, the winding angle and winding force of the rings 12 can be reasonably controlled to precisely control the winding tightness. This prevents the rings 12 from loosening or shifting during use and also avoids excessively tight winding that could lead to localized stress concentration in the core. After assembly, adjacent capacitor cores 11 are not directly attached; instead, they abut against each other through their respective outer rings 12, creating an equidistant separation between all cores. This structure, through the wrapping ring 12, achieves multiple effects including core positioning, insulation isolation, and shock absorption. It can effectively absorb vibrations and impacts during operation and transportation, significantly reducing the probability of mechanical stress damage to the capacitor core 11, and improving the overall operational reliability and service life of the capacitor. The core unit 1 can be arranged in a straight line, the capacitor core 11 can be a thin-film capacitor core, and the wrapping ring 12 can be formed by manual winding or automated equipment winding to adapt to different production capacity requirements.

[0021] Therefore, this capacitor core structure involves setting at least two core units 1, with a high-temperature resistant insulating ring 12 wound around the outside of each capacitor core 11, and at least two rings 12 arranged on a single core. Adjacent capacitor cores 11 abut against each other by the rings 12, achieving equidistant separation between the cores. This structure not only ensures accurate core positioning and stable insulation spacing with the help of the rings 12, but also uses the material of the rings 12 themselves to buffer vibration and impact, effectively reducing the probability of core damage due to mechanical stress and improving overall reliability.

[0022] Optionally, multiple core units 1 are arranged in multiple columns, with adjacent columns of core units 1 arranged in an aligned or staggered manner. Understandably, the aligned arrangement has a neat structure, simple processing and assembly procedures, and is suitable for conventional small and medium-sized film capacitors; the staggered arrangement can improve the utilization rate of the internal cavity space, accommodating more core units 1 within the same shell size 2, and is suitable for large-capacity, multi-core large power capacitors. The two arrangement methods can be freely switched according to the capacitor capacity, shell size, and overall installation space, offering greater versatility. In either the aligned or staggered arrangement, the retaining ring 12 can be arranged in an inclined manner.

[0023] Optionally, two loops 12 are wound alternately around the capacitor core 11 near both ends, with a preset distance d between the loops 12 and the side end faces of the capacitor core 11. Understandably, arranging the two loops 12 alternately in the region near both ends of the capacitor core 11, and pre-setting a preset distance d between the loops 12 and the end face of the gold-plated layer 111 of the capacitor core 11, is an optimized design that balances assembly, use, and cost. The loops 12 at both ends provide double-sided limiting support for the thin-film capacitor core 11, effectively preventing core displacement or tilting, and ensuring stable positioning. This arrangement also simultaneously meets the mating requirements between capacitor cores in the same group and adjacent groups. The mutual support and separation of each group of cores can be achieved solely through the loops 12 at both ends, eliminating the need to widen the loops 12 and effectively saving raw materials. Meanwhile, the reserved spacing will not interfere with the wiring and assembly of the core end, and also allows the retaining ring 12 to avoid the vulnerable position at the end. When subjected to vibration and impact, the retaining rings 12 at both ends can work together to share the load and fully protect the main structure of the capacitor core 11.

[0024] Optionally, the retaining ring 12 is made of at least one of the following materials: silicone rubber, ordinary rubber, insulating plastic, and high-temperature resistant insulating tape. Understandably, silicone rubber, ordinary rubber, insulating plastic, and high-temperature resistant insulating tape all possess excellent high-temperature resistance and insulation properties, enabling them to withstand the high-temperature operating conditions inside the capacitor for extended periods, effectively isolating adjacent capacitor cores 11 and eliminating the risk of leakage and short circuits. Rubber materials offer excellent elasticity and outstanding cushioning and shock absorption; insulating plastics provide greater rigidity, ensuring stable support and positioning without compression or deformation; and insulating tape is easy to process and adaptable to various core specifications. During production, a single material can be selected individually, or multiple layers can be wrapped together to simultaneously meet the multiple requirements of positioning support, cushioning and shock absorption, and electrical insulation.

[0025] Optionally, the spacing between two adjacent capacitor cores 11 is equal to the sum of the thicknesses of the two mating rings 12 on both sides. Understandably, if the thickness of a single ring 12 is t, the gap between two adjacent capacitor cores 11 is equal to the sum of the thicknesses of the two mating rings, 2t. This dimensional relationship provides a clear quantitative standard for core spacing. During production, only the thickness of the rings 12 needs to be set according to the required insulation distance in the design. After assembly, the spacing between adjacent film capacitor cores 11 will accurately meet the standard. Standardized dimensional matching significantly reduces assembly difficulty, ensuring uniform and consistent spacing between each group of cores. This not only meets the electrical insulation specifications but also allows all rings 12 to be simultaneously stressed and evenly mated, avoiding problems such as individual cores being suspended or overloaded due to inconsistent spacing, thus ensuring balanced stress on the overall structure.

[0026] Optionally, the system also includes a housing 2, the inner wall of which is provided with grooves 21 for positioning each core unit 1. Understandably, the grooves 21 inside the housing can individually limit the position of each group of core units 1, and together with the mutual support of the outer rings 12 of the cores, achieve dual positioning protection. Under transportation and equipment vibration conditions, the grooves 21 can restrict the overall lateral and longitudinal sliding of the core units 1, further preventing the cores from stacking and tilting or squeezing each other. At the same time, the grooves 21 can be adapted to both multi-row alignment and staggered arrangement. During assembly, the core units 1 with rings 12 can be directly embedded into the corresponding slots, resulting in high assembly efficiency and stronger structural stability of the finished product.

[0027] Furthermore, this invention proposes a multi-core capacitor, which includes the aforementioned capacitor core structure. Understandably, this multi-core capacitor uses a core unit 1 with an outer ring 12 separating the cores as its core components, and regularly integrates and assembles multiple sets of capacitor cores 11 inside the housing. The outer ring 12 of the cores achieves insulation isolation, rigid positioning, and elastic buffering between adjacent cores, solving the defects of traditional multi-core capacitors where the cores are directly bonded together without a buffer medium, making them susceptible to mechanical damage from gravity stacking, transportation vibration, and operational impacts. The ring 12 can be flexibly adjusted in thickness, material, and winding position according to insulation distance and seismic requirements, adapting to large-capacity, multi-core power capacitor scenarios. The overall internal assembly is simple, requiring no additional insulating strips or support pads, simplifying the internal component structure and reducing assembly time and material costs. Simultaneously, it can continuously and stably maintain a uniform insulation gap between cores, balancing electrical safety and structural reliability, and can be widely used in various power electronic devices such as frequency converters, energy storage, and power quality management.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0033] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A capacitor core structure, characterized in that, Includes at least two core units; Each of the core units includes a capacitor core and a retaining ring wrapped around the outside of the capacitor core. The retaining ring is made of high-temperature resistant insulating material. Each capacitor core has at least two retaining rings wrapped around it. Adjacent capacitor cores abut against each other through their respective retaining rings to form an equidistant separation structure.

2. The capacitor core structure according to claim 1, characterized in that, Multiple core units are arranged in multiple columns, with adjacent columns of core units arranged in an aligned or staggered manner.

3. The capacitor core structure according to claim 1, characterized in that, Two loops are wound alternately around the capacitor core near both ends, with a preset distance between the loops and the side end face of the capacitor core.

4. The capacitor core structure according to claim 1, characterized in that, The ring is made of at least one of the following materials: silicone rubber, ordinary rubber, insulating plastic, and high-temperature resistant insulating tape.

5. The capacitor core structure according to claim 1, characterized in that, The distance between two adjacent capacitor cores is equal to the sum of the thicknesses of the two rings that abut against each other on both sides.

6. The capacitor core structure according to claim 1, characterized in that, It also includes a housing, the inner wall of which is provided with grooves for positioning each of the core units.

7. A multi-core capacitor, characterized in that, Includes the capacitor core structure as described in any one of claims 1-6.

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