JPS6017892Y2 - Lead wire extraction structure of wound type capacitor - Google Patents

Description

[Detailed description of the invention] The present invention is directed to a capacitor element, particularly a wound type capacitor element in which an organic film such as a plastic film paper is used as a dielectric, and the dielectric film and metal thin film electrodes such as aluminum foil are alternately wound. The purpose of this method is to electrically stabilize the lead wire by arc welding, make it mechanically strong, and then draw it out.

Conventionally, conductive paint, soldering, spot welding, resistance welding, pressure welding, etc. have been commonly used to draw out lead wires from wound capacitors, but in any case, the electrical characteristics of the completed capacitor may deteriorate and the capacitor may deteriorate. This causes a decrease in productivity, an increase in defective products, and an increase in the price of capacitors.Also, if arc welding, which is known in many industrial sectors, is used to draw out the lead wires, the capacitor element may burn out. There were many disadvantages such as waste of raw materials and high risk of fire outbreak.

The most characteristic feature of the lead wire drawing structure of the wound type capacitor of the present invention is that a fused portion of a predetermined width and length is provided in the metal foil electrode on the end face of the wound type capacitor element, and the lead wire is attached to the fused portion. The capacitor is integrally welded to improve the electrical stability of the wound capacitor and the mechanical strength of the lead wire attachment, which further improves productivity and reduces the number of defective products. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lead wire extraction structure of a wound capacitor according to the present invention will be described in detail below with reference to the accompanying drawings showing embodiments.

The wound capacitor element 6 has a conventionally known shape such as a cylinder or a flat cylinder, and is made of a dielectric film 5 such as polyethylene terephthalate, polypropylene, polyester, capacitor paper, etc.
5 and aluminum foil electrodes 4, 4 are made to protrude.

FIG. 1 shows a state in which a fused portion 7 of a predetermined width and a predetermined depth is provided on the metal foil electrode 4 protruding from the end face of the wound capacitor element 6, and a method for forming the fused portion 7. is as follows.

That is, one arc welding electrode 1 is applied to one corner of the metal foil electrode 4, the other arc welding electrode 2 is brought close to the metal foil electrode 4, and the metal foil electrode 4 is moved while generating an arc.
By moving parallel to the end face of the electrode foil, adjacent electrode foil end edges are melted and integrated.

In this case, the depth of the fusion zone 7 is 0.3~1wn1 the width is 1~1wn1
The size and moving speed of the arc welding electrode 2 are determined so that 4rIrlrt.

FIG. 2 shows the metal foil electrode 4 of the wound capacitor element 6.
The figure shows the state in which the lead wire 14 is arc welded to the molten part 7 formed in the above-mentioned area.One arc welding electrode 1 is brought into contact with one corner of the metal foil electrode 4, and the lead wire 14 is attached to the upper surface of the fused part 7. The other electrode 2 for arc welding is provided close to the welding point of the lead wire 14, and the power source 3 is connected between both electrodes 1.2 for arc welding.
, the lead wire 14 and the molten part 7 are melted by an arc generated between the lead wire 14 and the molten part 7, and the molten part 7 and the lead wire are solidified simultaneously to fix the lead wire 14 to the metal foil electrode 4. , can be pulled out.

Note that the voltage, frequency, welding time, etc. of the power source 3 are appropriately determined depending on the thickness, material, etc. of the lead wire 14.

FIG. 4 shows a state in which the lead wire 14 is arc welded to the molten part 7 using a consumable electrode. One arc welding electrode is brought into contact with one corner of the metal foil electrode 4, and the upper surface of the molten part 7 is A consumable electrode supply device 10.11 which also serves as the other arc welding electrode is provided at a position directly above the melting point of the lead wire 14, and the arc welding electrode 1
A power source 3 is connected between the consumable electrode supply device 10.11 and the consumable electrodes 8, 9, which are supported by the consumable electrode supply device 10.11 and whose tips are close to the lead wire 14, and the lead wire 14.
In the same figure, due to the arc generated between
A certain amount of the lead wire 14, the melting part 7, and the tips of the consumable electrodes 8, 9 are melted at the positions indicated by 12.13, and then the melted lead wire 14, the melting part 7, and the consumable electrodes 8, 9 are melted. By solidifying the lead wires in one piece, the lead wires are fixed to the melted portion 7 and can be pulled out.

In this case, the voltage, frequency, or welding time of the power source 3, the supply amount of the consumable electrode, etc. are appropriately determined depending on the thickness, material, etc. of the lead wire 14.

The consumable electrodes include AI, Zn, Sb,
Thin wire of Pb, Sn, Cu, etc. or Zn and Sn, Sn
An alloy wire whose main components are Pb, Zn, Sn, and PI3 can be used.

Further, in FIG. 4, symbols 8' and 9' represent consumable electrodes 8 and 9', respectively.
This is a reel that winds up 9.

The above has described an embodiment in which the lead wire 14 and the welding part 7 are welded by arc welding, but the welding may be performed by soldering, spot welding, resistance welding, etc. other than arc welding.

In addition, as shown in FIG.
When welding the lead wire 14 and as shown in FIG.
Also when welding lead wires to the wound type capacitor element 6 where the dielectric films 5, 5 are flush with the metal foil electrodes 4, after forming the fused portion 7 in the same manner as described above, the leads are attached to the fused portion 7. By welding the wire 14, the lead wire 14 is fixed integrally and can be pulled out.

As described above, the present invention has a structure in which the lead wire is welded to the melted part after forming the melted part in the metal foil electrode, so the mechanical strength of the lead wire attachment is significantly improved, and short circuits and capacitance drains are prevented. Not only can it eliminate the occurrence of defective products such as, but also has a stable frequency characteristic, and has practical effects such as significantly improving the performance of electrical equipment, especially when used in acoustic circuits and high-frequency circuits.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a wound capacitor element showing a state in which a fused portion is provided in a metal foil electrode. FIG. 2 is a perspective view of a wound capacitor element showing a state in which a lead wire is arc welded to a molten part of a metal foil electrode. FIG. 3 is a perspective view of the wound capacitor element with the lead wires pulled out. FIG. 4 is a perspective view of a wound capacitor element showing a state in which a lead wire is arc welded using a consumable electrode on a molten part of a metal foil electrode. 5 and 6 are perspective views of wound type capacitor elements showing other embodiments. 1.2... Electrode for arc welding, 3...
Electrode, 4... Metal foil electrode, 7... Melting part, 8, 9... Consumable electrode, 14... Lead wire.

Claims (1)

[Scope of utility model registration request] A wound type capacitor element characterized in that a fused portion of a predetermined width and depth is provided in advance on the metal foil electrode on the end face diameter line, and a lead wire is integrally welded along the fused portion. Capacitor lead wire extraction structure.