Novel shielding plate and manufacturing method thereof

Abstract

The invention relates to the technical field of transformers, and particularly discloses a novel shielding plate and a manufacturing method thereof. The novel shielding plate comprises insulating paper boards and double-sided gummed paper, the insulating paper boards comprise a first insulating paper board and a second insulating paper board, and the double-sided gummed paper comprises a first double-sided gummed paper and a second double-sided gummed paper. The first double-sided gummed paper, the copper strip group, the semi-conductive paper, the second double-sided gummed paper and the second insulating paper board are sequentially laid on the first insulating paper board; according to the novel shielding plate, the combination of the copper strip, the semi-conductive paper and the insulating paper board enables the shielding capability of the shielding plate in an electric field and a magnetic field to be optimized, and the design of a multi-layer composite material enables the overall performance of the shielding plate to be effectively improved, so that electromagnetic interference can be better resisted; the use of the double-sided gluing paper can ensure the stable bonding of the copper strip, the semi-conductive paper and other materials, and the problem of swelling in the drying process is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a novel shielding plate and a manufacturing method thereof. Background Art

[0002] Due to its structure and working principle, the transformer oil tank will generate electromagnetic interference when it is running at high voltage. In order to prevent this interference from affecting the normal operation of the equipment, the wall of the oil tank of a large transformer generally needs to use electric shielding + magnetic shielding to shield and protect the oil tank wall and other structural parts. The structure of the conventional electric shielding plate includes insulating cardboard, copper tape and semi-conductive paper. Among them, the copper tape plays a conductive role, the semi-conductive paper provides electromagnetic wave absorption and isolation, and the insulating cardboard is used to provide insulation. The shielding plate is usually suspended above the magnetic shielding layer of the oil tank, and the end of the electric shielding plate is electrically connected to the wall of the oil tank. Due to the large size of the oil tank, the size of the electric shielding plate also needs to be increased accordingly. Therefore, the electric shielding plate usually needs to be customized into a large size to ensure that it covers the entire surface of the box. During the manufacturing process of the shielding plate, it usually needs to go through a certain drying process (such as drying) to remove excess moisture or allow glue and adhesive materials to solidify. However, during this process, the belly (middle area) of the shielding plate may bulge, resulting in poor contact between the copper tape and the semi-conductive, reduced insulation between the body and the electric shielding, causing discharge, and even causing electromagnetic interference problems, affecting the operating stability of the equipment.

[0003] In view of this, a new shielding plate and a manufacturing method thereof are invented to prevent the bulging problem from occurring. Summary of the invention

[0004] The purpose of the present invention is to provide a new shielding plate with simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A first aspect of the present invention provides a novel shielding plate, comprising an insulating cardboard and double-sided adhesive tape, wherein the insulating cardboard comprises a first insulating cardboard and a second insulating cardboard, the double-sided adhesive tape comprises a first double-sided adhesive tape and a second double-sided adhesive tape, and the first double-sided adhesive tape, a copper tape group, a semi-conductive paper, a second double-sided adhesive tape and a second insulating cardboard are sequentially laid on the first insulating cardboard.

[0007] Furthermore, the copper belt group includes a plurality of groups of copper belts, ends of which are welded with copper braided wires, and ends of the copper braided wires are connected to external metal contact points by welding.

[0008] Furthermore, the thickness of the first insulating paperboard and the second insulating paperboard are both 2 mm.

[0009] Furthermore, the semi-conductive paper and the second double-sided adhesive paper are fixed by point gluing with electrical white glue.

[0010] Furthermore, the thickness of the semi-conductive paper is 0.5 mm-2 mm, and the conductivity is 0.1 S / m-10 S / m.

[0011] Furthermore, it also includes a protective film, which covers the first insulating paperboard and the second insulating paperboard on the opposite side. The protective film is made of high temperature resistant and corrosion resistant material and can enhance the mechanical strength and durability of the shielding plate.

[0012] Furthermore, the copper belt groups are arranged in a circular shape, and multiple groups of copper belts are arranged in a concentric circle manner.

[0013] The second aspect of the present invention provides a novel shielding plate manufacturing method, which is used to prepare the novel shielding plate as described above, wherein the copper tape is evenly distributed on the semi-conductive paper, the end is welded to a copper tape, and the end is welded to the copper braided wire to lead out the shielding plate; a double-sided adhesive paperboard is placed on one of the 2mm cardboards, and then the copper tape group and the semi-conductive paper are placed in sequence; a layer of double-sided adhesive paper is continued to be placed on the semi-conductive paper, and the outline of the double-sided adhesive paper is the outline of the cardboard, and the double-sided adhesive paper and the semi-conductive paper are fixed with electrical white latex, and attention should be paid to less glue; finally, another insulating cardboard is placed on the double-sided adhesive paper, and attention should be paid to aligning the upper and lower layers of cardboard; finally, the shielding plate is pressed by overall hot pressing.

[0014] The beneficial effects of the present invention are as follows: the shielding plate designed by the present invention includes multiple different layers, each layer plays a role in electrical isolation, magnetic shielding and mechanical strength, the copper tape group provides a strong electromagnetic shielding effect, and the semi-conductive paper effectively enhances the absorption capacity of electromagnetic waves. The combination of copper tape, semi-conductive paper and insulating paperboard optimizes the shielding capacity of the shielding plate in electric and magnetic fields. The design of this multi-layer composite material effectively improves the overall performance of the shielding plate and can better resist electromagnetic interference. The use of double-sided adhesive tape can ensure the stable bonding of materials such as copper tape and semi-conductive paper, and avoid the problem of bulging during the drying process. Through reasonable glue bonding and material selection, the problem of uneven thermal expansion is reduced, which helps the shielding plate maintain its shape during the drying process and avoids local expansion or deformation caused by temperature difference changes or material shrinkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the shielding plate of the present invention;

[0016] Figure 2 It is a detailed cross-sectional view of the shielding plate of the present invention.

[0017] In the figure: 1. Insulating paperboard; 101. First insulating paperboard; 102. Second insulating paperboard; 2. Double-sided adhesive tape; 201. First double-sided adhesive tape; 202. Second double-sided adhesive tape; 3. Copper tape group; 4. Semi-conductive paper; 5. Copper tape. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] like Figure 1 , Figure 2 As shown, a novel shielding plate and a manufacturing method thereof include an insulating paperboard 1 and a double-sided adhesive tape 2, wherein the insulating paperboard 1 includes a first insulating paperboard 101 and a second insulating paperboard 102, and the double-sided adhesive tape 2 includes a first double-sided adhesive tape 201 and a second double-sided adhesive tape 202, and the first double-sided adhesive tape 201, a copper tape group 3, a semi-conductive paper 4, a second double-sided adhesive tape 202 and the second insulating paperboard 102 are sequentially laid on the first insulating paperboard 101.

[0020] In a specific embodiment, the copper belt group 3 includes a plurality of copper belts 5, ends of which are welded with copper braided wires, and ends of the copper braided wires are connected to external metal contact points by welding.

[0021] The copper tape 5 has excellent electrical conductivity and electromagnetic shielding performance, can effectively reflect and absorb electromagnetic interference, and enhance the shielding effect. The connection form of the copper braided wire ensures the stability and reliability of the electrical contact point, and reduces electromagnetic wave leakage or electrical failure that may be caused by poor contact.

[0022] In a specific implementation manner, the thickness of the first insulating paperboard 101 and the second insulating paperboard 102 are both 2 mm.

[0023] The thickness of the first insulating paperboard 101 and the second insulating paperboard 102 are both 2 mm, which can effectively isolate electrical components and avoid equipment failure caused by current flow or electrical leakage.

[0024] In a specific implementation manner, the semi-conductive paper 4 and the second double-sided adhesive paper 202 are fixed by sticking with electrical white glue.

[0025] It should be noted that the semi-conductive paper 4 has a certain conductivity, which can effectively absorb electromagnetic waves and reduce the propagation of electromagnetic interference. At the same time, the semi-conductive paper has a certain buffering effect on the distribution of the electric field, further enhancing the shielding effect; the contact points between the semi-conductive paper and the double-sided adhesive tape are fixed by using electrical white latex to avoid the loosening problem caused by thermal expansion and ensure the long-term stable bonding between the materials.

[0026] In a specific implementation, the thickness of the semi-conductive paper 4 is 0.5 mm-2 mm, and the conductivity is 0.1 S / m-10 S / m.

[0027] In a specific implementation, a protective film is also included. The protective film covers the opposite sides of the first insulating paperboard 101 and the second insulating paperboard 102. The protective film is made of high temperature resistant and corrosion resistant material and can enhance the mechanical strength and durability of the shielding plate.

[0028] The protective film can effectively improve the high temperature resistance and corrosion resistance of the shielding plate, and extend the service life of the shielding plate, especially when working in harsh environments, such as high temperature, high humidity or chemical corrosion environments;

[0029] High temperature and corrosion resistant materials help protect the internal structure of the shielding plate and prevent the external environment from corroding the internal materials, thus maintaining its stability and reliability.

[0030] In a specific implementation, the copper belt group 3 is arranged in a circular shape, and the multiple groups of copper belts 5 are arranged in a concentric circle.

[0031] The concentric arrangement of copper strips helps to evenly distribute the current and improve the shielding effect of electromagnetic waves of different frequencies. The circular arrangement can better reflect and absorb electromagnetic waves, prevent electromagnetic interference from accumulating in local areas, and enhance the overall shielding performance;

[0032] This arrangement can effectively deal with electromagnetic interference of different frequencies, and has greater advantages especially in applications that need to cover a wide frequency band.

[0033] The novel shielding plate manufacturing method is as follows:

[0034] a) Laying a first double-sided adhesive tape 201 on a 2 mm thick first insulating paperboard 101;

[0035] b) laying a copper tape group 3 and a semi-conductive paper 4 in sequence on the first double-sided adhesive paper 201;

[0036] c) laying a second double-sided adhesive paper 202 on the semi-conductive paper 4, and the contour of the second double-sided adhesive paper 202 is consistent with the contour of the insulating paperboard 101;

[0037] d) using electrical white glue to fix the semi-conductive paper 4 and the second double-sided adhesive paper 202, and the amount of electrical white glue used is relatively small;

[0038] e) Laying the second insulating paperboard 102 on the second double-sided adhesive tape 202 and ensuring that the first insulating paperboard 101 and the second insulating paperboard 102 are aligned;

[0039] f) hot pressing the above structure as a whole to form a shielding plate.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A novel shielding plate, characterized in that: The invention comprises an insulating paperboard (1) and double-sided adhesive tape (2), wherein the insulating paperboard (1) comprises a first insulating paperboard (101) and a second insulating paperboard (102), the double-sided adhesive tape (2) comprises a first double-sided adhesive tape (201) and a second double-sided adhesive tape (202), and the first double-sided adhesive tape (201), a copper tape group (3), semi-conductive paper (4), a second double-sided adhesive tape (202) and the second insulating paperboard (102) are sequentially laid on the first insulating paperboard (101).

2. A novel shielding plate according to claim 1, characterized in that: The copper belt group (3) comprises a plurality of groups of copper belts (5), the ends of which are welded with copper braided wires, and the ends of the copper braided wires are connected to external metal contact points by welding.

3. A novel shielding plate according to claim 2, characterized in that: The thickness of the first insulating paperboard (101) and the second insulating paperboard (102) are both (2) mm.

4. A novel shielding plate according to claim 3, characterized in that: The semi-conductive paper (4) and the second double-sided adhesive paper (202) are fixed by point gluing with electrical white glue.

5. A novel shielding plate according to claim 4, characterized in that: The thickness of the semi-conductive paper (4) is 0.5 mm to 2 mm, and the conductivity is 0.1 S / m to 10 S / m.

6. A novel shielding plate according to claim 5, characterized in that: It also includes a protective film, which covers the opposite side of the first insulating paperboard (101) and the second insulating paperboard (102). The protective film is made of high temperature resistant and corrosion resistant material and can enhance the mechanical strength and durability of the shielding plate.

7. A novel shielding plate according to any one of claims 1 to 6, characterized in that: The copper belt group (3) is arranged in a circular shape, and the plurality of copper belt groups (5) are arranged in a concentric circle manner.

8. A novel shielding plate manufacturing method, used for preparing the novel shielding plate as claimed in claim 1, characterized in that: First, evenly distribute the copper tape on the semi-conductive paper, weld one end of the copper tape to the end, and weld the end to the copper braided wire to lead out the shielding plate; put double-sided adhesive paper on one of the 2mm cardboards, and then put the copper tape group and semi-conductive paper in turn; Continue to lay a layer of double-sided adhesive paper on the semi-conductive paper. The outline of the double-sided adhesive paper is the outline of the cardboard. Use electrical white latex to glue the double-sided adhesive paper and the semi-conductive paper together. Place another piece of insulating cardboard on the double-sided tape, making sure the upper and lower layers of cardboard are aligned; Finally, the shielding plate is pressed by an overall hot pressing method.

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