A coil shielding structure

Abstract

The utility model discloses a coil shielding structure, including a ground copper band, a plurality of shielding copper band and two paperboards, two paperboards are opposite to set along the front -back direction, and the ground copper band and a plurality of shielding copper band are set between two paperboards, and the ground copper band and a plurality of shielding copper band all are connected with two paperboards, shielding copper band is along the length direction of paperboard and is extended and is set, a plurality of shielding copper band is along the width direction of paperboard and is spaced and is set, and a plurality of shielding copper band is parallel to each other, and the same end of ground copper band and a plurality of shielding copper band is connected, and ground copper band is along the width direction of paperboard and is extended and is set, and one end of ground copper band extends to the outside of paperboard. Through the interval arrangement of shielding copper band and the connection with ground copper band, replace traditional whole copper foil structure, solved the problem of high material cost, big shielding loss and complicated installation, has the advantages such as reducing purchase cost, optimizing electromagnetic performance and improving structural stability.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a coil shielding structure. Background Technology

[0002] In the manufacturing of power transformers, to suppress leakage flux, reduce winding eddy current losses, and ensure stable product performance, an electromagnetic shielding structure is typically installed between the high-voltage and low-voltage windings of the coil. Traditional shielding structures generally use a single, wide sheet of copper foil, the width of which needs to be customized according to the specific height of the coil. In practice, two sheets of copper foil of the customized width are wound around the coil, and a copper strip is used to lead it out and ground it.

[0003] However, this traditional structure has many inherent drawbacks. First, in terms of materials, different specifications of products require the procurement of copper foil of various widths, which not only increases the complexity of material procurement and inventory costs, but also leads to higher raw material costs because the copper foil is a single sheet of material. Second, from an electromagnetic performance perspective, the single-sheet copper foil structure is prone to shielding losses and high current density, affecting the overall operating efficiency of the equipment.

[0004] The aforementioned problems not only increase manufacturing costs and management difficulties, but also restrict the improvement of equipment performance and production efficiency, making it urgent to optimize and improve the existing shielding structure. Utility Model Content

[0005] In response to the problems raised in the background art, the purpose of this utility model is to propose a coil shielding structure that has the advantages of effectively reducing material costs and inventory management difficulties, reducing shielding losses, and improving the stability of electromagnetic shielding effect.

[0006] To achieve this objective, the present invention adopts the following technical solution: A coil shielding structure includes a grounding copper strip, several shielding copper strips, and two cardboard sheets; The two cardboard sheets are arranged opposite each other in the front-to-back direction, and the grounding copper strip and several shielding copper strips are arranged between the two cardboard sheets. The grounding copper strip and several shielding copper strips are all connected to the two cardboard sheets. The shielding copper strip extends along the length of the cardboard, and several shielding copper strips are spaced apart along the width of the cardboard and are parallel to each other. The grounding copper strip is connected to the same end of the several shielding copper strips, and the grounding copper strip extends along the width of the cardboard, with one end of the grounding copper strip extending to the outside of the cardboard.

[0007] Preferably, a number of vertical support ribs are provided between the two pieces of cardboard; The vertical support ribs extend along the width direction of the cardboard, and a plurality of the vertical support ribs are spaced apart along the length direction of the cardboard. Each vertical support rib is connected to a plurality of shielding copper strips and the cardboard.

[0008] Preferably, the vertical support rib is adhesive tape, which is used to fix several of the shielding copper strips to one side of the cardboard.

[0009] Preferably, the shielding copper strip is welded to the grounding copper strip.

[0010] Preferably, the width of the shielding copper strip is in the range of 50mm to 200mm.

[0011] Preferably, the width of the grounding copper strip is in the range of 10mm to 30mm.

[0012] Preferably, the distance between two adjacent shielding copper strips is d, where 30mm≤d≤60mm.

[0013] Preferably, the thickness of the cardboard is in the range of 0.3 mm to 1 mm.

[0014] Compared with the prior art, one of the above technical solutions has the following beneficial effects: By arranging shielding copper strips at intervals and connecting them to grounding copper strips, the traditional whole copper foil structure is replaced, which solves the problems of high material cost, large shielding loss and complicated installation. It has the advantages of reducing procurement costs, optimizing electromagnetic performance and improving structural stability. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of one embodiment of the present invention (excluding cardboard and vertical support ribs). Figure 2 This is a schematic diagram of another embodiment of the present invention.

[0016] The components include: grounding copper strip 1, shielding copper strip 2, cardboard 3, and vertical support rib 4. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 utility model 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 utility model.

[0019] Furthermore, the terms "first," "second," and "third" 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," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0020] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The following is in conjunction with the appendix Figures 1 to 2 The technical solution of this utility model will be further illustrated through specific implementation methods.

[0022] A coil shielding structure includes a grounding copper strip 1, several shielding copper strips 2, and two cardboard sheets 3; Two cardboard sheets 3 are arranged opposite each other in the front-to-back direction. The grounding copper strip 1 and several shielding copper strips 2 are arranged between the two cardboard sheets 3. The grounding copper strip 1 and several shielding copper strips 2 are all connected to the two cardboard sheets 3. The shielding copper strip 2 extends along the length of the cardboard 3, and several shielding copper strips 2 are spaced apart along the width of the cardboard 3 and are parallel to each other. The grounding copper strip 1 is connected to the same end of the several shielding copper strips 2, and the grounding copper strip 1 extends along the width of the cardboard 3, with one end of the grounding copper strip 1 extending to the outside of the cardboard 3.

[0023] The shielding structure of this invention is installed between the high-voltage and low-voltage windings of a transformer. Two cardboard sheets 3 are arranged opposite each other to form a sandwich shielding space, providing mechanical support and electrical insulation for the shielding copper strip 2 and the grounding copper strip 1. The shielding copper strip 2 extends along the length of the cardboard sheet 3 and is arranged parallel and spaced apart along the width of the cardboard sheet 3, forming multiple independent conductive channels. The grounding copper strip 1 connects one end of all the shielding copper strips 2 along the width of the cardboard sheet 3, establishing a parallel conductive path. When the coil is working, the electromagnetic field forms dispersed eddy current paths between the shielding copper strips 2, reducing the current density per unit area. The grounding copper strip 1 collects and discharges the induced current of each shielding copper strip 2, ensuring effective electromagnetic shielding.

[0024] The shielding structure of this utility model adapts to different transformer product specifications through the standardized combination of shielding copper strip 2 and grounding copper strip 1, reducing the types of special materials; the discrete conductive layout of the shielding structure disperses the eddy current path and reduces the overall shielding loss; the sandwich shielding space composed of two cardboard sheets 3 simplifies the assembly process of the shielding structure and improves production consistency while ensuring the mechanical strength of the shielding structure.

[0025] Furthermore, several vertical support ribs 4 are provided between the two pieces of cardboard 3; The vertical support ribs 4 extend along the width direction of the cardboard 3, and a plurality of the vertical support ribs 4 are spaced apart along the length direction of the cardboard 3. Each vertical support rib 4 is connected to a plurality of shielding copper strips 2 and the cardboard 3 respectively.

[0026] The vertical support rib 4 refers to the strip-shaped support structure set perpendicular to the length direction of the shielding copper strip 2, which is used to form multi-point support between the two cardboard sheets 3 to fix the position of the shielding copper strip 2.

[0027] Specifically, vertical support ribs 4 extending along the width direction are spaced apart along the length of the cardboard 3, allowing each rib 4 to simultaneously contact multiple parallel shielding copper strips 2. The connection between the vertical support ribs 4, the cardboard 3, and the shielding copper strips 2 forms a three-dimensional support network, suppressing the displacement and deformation of the shielding copper strips 2 in the longitudinal direction (width direction of the cardboard) under the influence of an electromagnetic field. The spaced-apart vertical support ribs 4 ensure that each shielding copper strip 2 has at least two support points while avoiding material waste caused by using a continuous support structure. Furthermore, the extension of the vertical support ribs 4 along the width direction of the cardboard 3 allows them to completely cover the distribution range of the shielding copper strips 2, providing support when the shielding copper strips 2 are subjected to external forces (such as gravity or electromagnetic forces), reducing the risk of local stress concentration.

[0028] Furthermore, the vertical support rib 4 is adhesive tape, which is used to fix several of the shielding copper strips 2 to one side of the cardboard 3.

[0029] The vertical support rib 4 is made of adhesive tape. The tape has adhesive properties, and its adhesive force can fix the shielding copper tape 2 to one side of the cardboard 3 to form a physical connection.

[0030] Specifically, during the assembly process of the shielding structure, a cardboard 3 is first laid flat, and then several shielding copper strips 2 are laid on the cardboard 3 at intervals, and the grounding copper strip 1 is connected to the several shielding copper strips 2. Then, the shielding copper strips 2 are pasted on the cardboard 3 in the vertical direction (the width direction of the cardboard 3) using tape. The several strips of tape represent several connection support parts (support points) between the shielding copper strips 2 and the cardboard 3. Finally, another cardboard is placed on top of the fixed shielding copper strips 2, grounding copper strips 1 (and tape), so that the two cardboards 3 cover all the shielding copper strips 2 and grounding copper strips 1 from the front and back.

[0031] Furthermore, the shielding copper strip 2 is welded to the grounding copper strip 1.

[0032] During assembly, the ends of the grounding copper strip 1 and several shielding copper strips 2 are aligned, and then a local heat source is used to melt the metal at their contact surfaces to form solder joints. After cooling and solidifying, the molten metal forms a dense bond, creating a seamless conductive interface between the shielding copper strips 2 and the grounding copper strip 1. This connection method avoids the oxidation problems at the contact surfaces caused by bolted or adhesive connections. Simultaneously, the mechanical strength of the solder joints can resist vibration stress during equipment operation, ensuring a stable shielding structure.

[0033] Furthermore, the width of the shielding copper strip 2 ranges from 50mm to 200mm.

[0034] By replacing traditional full-width copper foil with shielding copper strips 2 with widths ranging from 50 mm to 200 mm, standard-sized copper strip materials can be used directly. The standardized shielding copper strips 2 eliminate the need for customization based on coil height, thus reducing the types of materials procured and simplifying inventory management. In terms of electromagnetic performance, this width range of copper strips allows for the coverage of the required shielding area through multiple parallel arrangements, while the limited width of individual strips reduces the risk of localized current concentration. Simultaneously, the gaps between the shielding copper strips 2 form distributed electromagnetic shielding paths, which are more effective in suppressing eddy current losses compared to the continuous conductive surface of a full-width copper foil.

[0035] Furthermore, the width of the grounding copper strip 1 ranges from 10mm to 30mm.

[0036] The width of the grounding copper strip 1 is limited to between 10 mm and 30 mm, solving the material waste and performance defects caused by unreasonable width in traditional shielding structures. When the width of the grounding copper strip 1 is too small, insufficient conductive cross-sectional area may lead to increased grounding resistance, affecting current conduction capacity; when the width of the grounding copper strip 1 is too wide, copper consumption increases but the improvement in conductivity is limited, resulting in resource waste. By setting this range, both the grounding circuit has good current carrying capacity and the size of the grounding copper strip 1 is adapted to coil structures of different specifications, achieving standardized production.

[0037] Furthermore, the distance between two adjacent shielding copper strips 2 is d, where 30mm≤d≤60mm.

[0038] The distance between two adjacent shielding copper strips 2 is set to ensure uniform electromagnetic field coverage, thus avoiding the problems of reduced leakage magnetic field suppression due to excessive spacing, or material redundancy and uneven current density distribution caused by excessive spacing.

[0039] The distance between two adjacent shielding copper strips 2 is limited to between 30 mm and 60 mm, which can meet the leakage magnetic field suppression requirements of coils of different sizes, and also standardize the width of the shielding copper strips 2. By limiting the spacing range, the layout of the shielding copper strips 2 is constrained within the balance range of electromagnetic performance and material cost, so that the same specification of shielding copper strips 2 can be adapted to various coil heights without the need to customize a whole copper foil for different products.

[0040] Furthermore, the thickness of the cardboard 3 ranges from 0.3 mm to 1 mm.

[0041] When the thickness of the cardboard 3 is within the range of 0.3 mm to 1 mm, its compressive strength is sufficient to support the electromagnetic circuit formed by the shielding copper strip 2 and the grounding copper strip 1. Simultaneously, by optimizing the thickness of the cardboard, the dielectric constant of the cardboard 3 is matched with the conductivity characteristics of the copper strip. During assembly, the appropriately thick cardboard 3 can withstand the thermal stress generated by the copper strip and compensate for manufacturing defects through its own elastic deformation. This thickness range allows the cardboard 3 to maintain flatness while forming a complementary structure with the vertical support rib 4, jointly limiting the vibration displacement of the shielding copper strip 2 during use or installation.

[0042] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A coil shielding structure, characterized in that: It includes a grounding copper strip, several shielding copper strips, and two pieces of cardboard; The two cardboard sheets are arranged opposite each other in the front-to-back direction, and the grounding copper strip and several shielding copper strips are arranged between the two cardboard sheets. The grounding copper strip and several shielding copper strips are all connected to the two cardboard sheets. The shielding copper strip extends along the length of the cardboard, and several shielding copper strips are spaced apart along the width of the cardboard and are parallel to each other. The grounding copper strip is connected to the same end of the several shielding copper strips, and the grounding copper strip extends along the width of the cardboard, with one end of the grounding copper strip extending to the outside of the cardboard.

2. The coil shielding structure according to claim 1, characterized in that: Several vertical support ribs are also provided between the two pieces of cardboard; The vertical support ribs extend along the width direction of the cardboard, and a plurality of the vertical support ribs are spaced apart along the length direction of the cardboard. Each vertical support rib is connected to a plurality of shielding copper strips and the cardboard.

3. The coil shielding structure according to claim 2, characterized in that: The vertical support ribs are made of adhesive tape, which is used to fix several of the shielding copper strips to one side of the cardboard.

4. A coil shielding structure according to claim 2, characterized in that: The shielding copper strip is welded to the grounding copper strip.

5. A coil shielding structure according to claim 2, characterized in that: The width of the shielding copper strip ranges from 50mm to 200mm.

6. A coil shielding structure according to claim 2, characterized in that: The width of the grounding copper strip ranges from 10mm to 30mm.

7. A coil shielding structure according to claim 2, characterized in that: The distance between two adjacent shielding copper strips is d, where 30mm≤d≤60mm.

8. A coil shielding structure according to claim 2, characterized in that: The thickness of the cardboard ranges from 0.3 mm to 1 mm.

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