JPS6031240Y2 - metallized film capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a metallized film capacitor using insulated stranded wires as lead wires, impregnated with insulating oil and coated with resin.

Conventionally, the structure of this type of capacitor is as shown in FIG. 1, in which an insulating coated stranded wire 3 as shown in FIG.
The four parts of the strands are attached and housed in, for example, a resin case 5, and the cavity of the resin case 5 is filled with sealing resin 6. For example, during welding or soldering, the insulating oil oozes out due to heat, so an oil film 7 is formed on the end face of the strand 4, and the sealing resin 6 is not adhered to this part.

In this case, as shown in FIG. 3, the surface of the strand 4 is generally covered with a plating layer 8 made of vinegar or solder, but the end face remains as it is after being cut, so the strands constituting the strand 4 are A small gap (in the length direction) forms a passage between the capacitor element 1 and the outside air, which has the drawback of deteriorating the capacitor characteristics due to oil leakage and moisture absorption.

The present invention has been made in view of the above points, and a bent part is provided at the end of the attachment side of the wire part of the insulated stranded wire to be attached to the electrode lead-out part, and the tip of the bent part is connected to the electrode lead-out part. The object of the present invention is to provide a metallized film capacitor that does not suffer from characteristic deterioration due to oil leakage or moisture absorption by positioning the capacitor in a vertical direction.

An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIG. 4, a pair of metallized plastic films are overlapped and wound, and electrode lead-out portions 11a are formed on both end surfaces.
As shown in FIG. 5, a plating layer 13 of tin or solder was formed on the surface of the electrode lead-out portions 11a and llb, which were impregnated with insulating oil on the capacitor element 12 formed with the capacitor elements 12 and 11b, and a bent portion 14 was provided at the tip. The 15 parts of the strands of the insulating coated stranded wire 16 consisting of 15 parts of the strands are brought into contact with each other so that the tips of the bent parts 14 are positioned perpendicularly to the surfaces of the electrode lead-out parts 11a and llb, and welded or soldered. The electrode lead-out portions 11a and llb surfaces and the tip end dimension l of the bent portion 14 are secured.

However, it is stored in a resin case 17, filled with sealing resin 18 from the opening of the resin case 17, and then hardened.

According to the capacitor constructed as described above, the surface of the strand 15 of the insulated stranded wire 16 is made of the plating layer 13, and the bent portion 14 is provided at the tip, and the tip of the bent portion 14 is an electrode lead-out portion. Since it is located perpendicular to the planes 11a and 11b, the tip end surface is not covered with an oil film and even when cut as it is, the end surface is covered with the sealing resin 18 and is connected to the tip of the lead-out portion of the insulated stranded wire 16. No passageway is formed between them.

Therefore, there is no possibility of oil leakage or deterioration of the capacitor element 12 due to moisture absorption.

Next, the effects of the present invention will be explained in detail based on experimental results.

That is, the humidity of the present invention (4) shown in Fig. 4, in which a pair of metallized polypropylene films are wound and the electrical insulating oil shown in JIS C2320, type 2, No. 3, is used as the insulating oil, and the conventional example (B) shown in Fig. 1. 90% to 95% Tan δ (%) was measured with respect to time after being left in a humidity chamber at a temperature of 40° C. The results are shown in FIG. 6.

The capacitor rating is (A) (Bl) both 200V, AC
-3 μF and the measured value is the average value of sample 2.

Moreover, one dimension in the present invention (4) was set to 0.2ya.

As is clear from FIG. 6, in the conventional example (B), the tan δ tends to increase after the 5 Ctf interval has passed, whereas in the present invention (4), the initial value of tan δ characteristics is maintained even after the 1 ooti interval has passed. , 5 sheets each formed under the same conditions as the present invention (4) and the conventional example (B)) were heated at 75°C.
As a result of examining the number of oil leaks after standing for a period of time, the conventional example (B) had a number of oil leak failures, while the present invention had zero, demonstrating the excellent effects of the present invention.

As described above, according to the present invention, only the surface of the insulated stranded wire is plated to be attached to the electrode lead-out portion of the capacitor element impregnated with insulating oil, and the end of the wire portion on the attachment side is folded. By providing a bent portion and locating the tip of the bent portion in a direction perpendicular to the surface of the electrode lead-out portion, it is possible to obtain a metallized film capacitor free from characteristic deterioration due to oil leakage and moisture absorption.

[Brief explanation of the drawing]

Figures 1 to 3 relate to conventional examples; Figure 1 is a sectional view of a capacitor, Figure 2 is a front view of an insulated stranded wire, and Figure 3 is an illustration of the insulated stranded wire shown in Figure 2. -A' An enlarged sectional view, FIGS. 4 and 5 are an embodiment of the present invention, FIG. 4 is a sectional view showing a capacitor, and FIG. 5 is an insulated stranded wire constituting the capacitor shown in FIG. 4. FIG. 6 is a characteristic curve diagram showing time-tan δ. 11a, llb... electrode lead-out section, 12...
... Capacitor element, 13 ... Plating layer, 14
...Bent part, 15... Element wire, 16...
...Insulated stranded wire, 17...Resin case,
18...Sealing resin.

Claims (1)

[Scope of utility model registration request] A capacitor element having electrode lead-out portions formed on both end faces and impregnated with insulating oil, and an insulated stranded wire having a plating layer applied to the surface of the wire portion attached to the electrode lead-out portion and a bent portion formed at the tip. , comprising a resin case housing the capacitor element, a resin case filled in a cavity of the resin case, and an opening resin filled in the cavity of the resin case, with the tip of the bent portion facing the electrode lead-out portion surface. A metallized film capacitor characterized in that it is oriented perpendicular to the surface of the metallized film capacitor.