Oil-immersed copper foil type capacitor

Abstract

The utility model belongs to the electronic industry, and particularly relates to an oil-immersed copper foil type capacitor, which is characterized in that an inner ring copper foil layer wound with an oil-immersed layer is arranged in the axial middle in a shell, outer ring copper foil layers wound with the oil-immersed layer are arranged at the periphery of the inner ring copper foil layer at intervals, and the outer ring copper foil layers are longer than the inner ring copper foil layer; dielectric film combination layers are arranged in a gap between the inner ring copper foil layer and the outer ring copper foil layer and on the periphery of the outer ring copper foil layer, and the middle range of the shell and the periphery of the dielectric film combination layer on the periphery of the outer ring copper foil layer are filled with inner filling epoxy resin. Outgoing lines which are parallel to the end surfaces of the shell and are connected with the core part of the capacitor are arranged at the outer centers of the shell and the end surfaces of the two ends filled with the epoxy resin; and insulating sleeves with two different colors are arranged at the peripheries of the two outgoing lines. The area of the copper foil electrode is increased, the capacitor can store more charges, the insulating medium film layer can provide larger capacitance, the over-current capability is high, the impact current resistance is high, and multi-time inter-electrode short-circuit discharge can be carried out.

Description

Technical Field

[0001] The utility model belongs to the electronics industry and is particularly designed to be an oil-immersed copper foil capacitor. Background Art

[0002] At present, capacitors used in power circuits of electronic components, especially capacitors used in audio amplifiers, are very likely to cause audio signal distortion and interference, affecting the sound quality. In addition, capacitors have internal resistance that easily generates inductance, produces noise, and has a short service life. Summary of the invention

[0003] The utility model aims to overcome the above technical deficiencies and provide an oil-immersed copper foil capacitor with compact structure, anti-interference, low noise and long service life.

[0004] The technical solution adopted by the utility model to solve the technical problem is: the oil-immersed copper foil capacitor comprises a shell and a lead wire, and is characterized in that an inner copper foil layer wound with an oil-immersed layer is arranged in the axial middle of the shell, an outer copper foil layer wound with an oil-immersed layer at intervals on the periphery of the inner copper foil layer, the outer copper foil layer is longer than the inner copper foil layer, a dielectric film composite layer is arranged in the interval between the inner copper foil layer and the outer copper foil layer and on the periphery of the outer copper foil layer, the periphery of the dielectric film composite layer in the middle range of the shell and on the periphery of the outer copper foil layer is filled with an inner filling epoxy resin, the inner filling epoxy resin at both ends of the shell forms a sealing surface, a lead wire connected to the capacitor core in parallel with the shell end face is arranged at the outer center of the end faces of the shell and the inner filling epoxy resin at both ends, and two insulating sleeves of different colors are arranged on the peripheries of the two lead wires.

[0005] The utility model has the following beneficial effects: the oil-immersed copper foil capacitor can increase the area of ​​the copper foil electrode, the capacitor can store more charge, the insulating dielectric film layer can provide a larger capacitance, the current capacity is strong, the impact current resistance is large, and multiple inter-electrode short-circuit discharges can be performed. The oil of the oil-immersed copper foil can easily penetrate into the core, and the residual gas inside the core can be easily removed, so the heat dissipation and insulation performance are good. Moreover, the anti-interference, low noise, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The following is a detailed description of the embodiments with reference to the accompanying drawings.

[0007] Figure 1 This is the external structure diagram of the oil-immersed copper foil capacitor.

[0008] Figure 2 yes Figure 1 AA section enlarged structure diagram.

[0009] In the figure, 1-shell; 2-filled with epoxy resin; 3-lead wire; 4-insulating sleeve; 5-oil immersion layer; 6-outer copper foil layer; 7-inner copper foil layer; 8-dielectric film combination layer. DETAILED DESCRIPTION

[0010] For example, see the attached Figure 1 , 2 The oil-impregnated copper foil capacitor is a capacitor having an inner copper foil layer 7 wound in the middle of the housing 1, and an outer copper foil layer 6 arranged at intervals outside the inner copper foil layer 7. The inner copper foil layer 7 and the outer copper foil layer 6 are wound in parallel for two turns at an even distance, and the outer copper foil layer 6 is 1.5-3 turns longer than the inner copper foil layer 7. The inner copper foil layer 7 and the outer copper foil layer 6 are both impregnated with oil before winding to form an oil-impregnated layer 5. A dielectric film composite layer 8 is arranged in the interval between the inner copper foil layer 7 and the outer copper foil layer 6 and outside the outer copper foil 6 as an insulating medium. The insulating medium adopts a PPT base film, which has good insulating properties and effectively prevents the flow of charge. The dielectric film composite layer 8 in the middle range of the housing 1 and outside the outer copper foil layer 6 is filled with epoxy resin 2. The epoxy resin 2 is filled inside the two ends of the housing 1 and the outer end surface is formed into a sealing surface. A lead wire 3 connected to the capacitor core in parallel with the end face sealing surface is arranged at the center outside the end face sealing surface of the outer shell 1 and the epoxy resin filled inner 2. Two different colors of insulating sleeves 4 are sheathed on the periphery of the lead wire 3. The insulating sleeve 4 can be black and yellow or red and black, and the two colors represent the positive and negative poles respectively.

[0011] The working principle of the utility model is: the oil-immersed copper foil capacitor is formed by winding two oil-immersed outer copper foils 6 and inner copper foils 7 of unequal lengths and two dielectric film combination layers 8. The outer copper foil layer 6 and the dielectric film combination layer 8 are 1.5 to 3 more turns than the inner copper foil layer 7 and the dielectric film combination layer 8, forming electromagnetic isolation and playing an anti-interference role. The capacitor can store more charge, and the dielectric film combination layer 8 can also provide a larger capacitance. The oil-immersed copper foil has a strong current carrying capacity and a large impact current resistance capacity, thereby improving the life of the capacitor.

Claims

1. An oil-immersed copper foil capacitor, comprising a housing (1) and lead wires (3), characterized in that: An inner copper foil layer (7) wound with an oil-impregnated layer (5) is provided in the axial middle of the outer shell (1); an outer copper foil layer (6) wound with an oil-impregnated layer (5) is spaced outside the inner copper foil layer (7); the outer copper foil layer (6) is longer than the inner copper foil layer (7); a dielectric film composite layer (8) is provided in the gap between the inner copper foil layer (7) and the outer copper foil layer (6) and outside the outer copper foil layer (6); the dielectric film composite layer (8) in the middle range of the outer shell (1) and outside the outer copper foil layer (6) is filled with an internal filling epoxy resin (2); and the internal filling epoxy resin (2) is formed at both ends of the outer shell (1) to form a sealing surface.

2. The oil-immersed copper foil capacitor according to claim 1, characterized in that: Lead wires (3) connected to the capacitor core in parallel with the end faces of the outer shell (1) are provided at the outer centers of the end faces of both ends of the outer shell (1) and the epoxy resin filled inner shell (2), and insulating sleeves (4) of two different colors are provided around the two lead wires (3).

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