JPS59213121A - Dry capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a capacitor for starting a motor of a washing machine, etc., and in particular, the present invention relates to a capacitor for starting a motor of a washing machine, etc. This invention relates to a dry type capacitor in which the outer cover is formed by resin molding and then the capacitor core wire is closed.

[Background of the invention]

6 Conventionally, this type of dry-type α-nodensor attaches terminals to the capacitor element, then stores it in a separately prepared box-like case, and pours a casting resin such as epoxy resin into it to solidify it, thereby connecting the capacitor element to the outside air. It was shut off and connected to the capacitor. The structure of the conventional product will be explained with reference to FIGS. 7 and 8. The capacitor 15, which is a capacitor, houses the capacitor element 6 in a case 2o formed by resin molding and has an open top, and is used for external connection. The tip of the terminal 18 of the capacitor element 6 is made to protrude outside, and the casting resin 21 is poured into the capacitor element 6.
The air is cut off from the outside air. Reference numeral 7 denotes a metallic contact, 10 an extended end of the terminal 18, which is a metallic contact connection part, and 16.17 an outer cover and side surface formed by the case 2o.

The manufacturing method of this capacitor is to attach the terminal 18 to the capacitor cable 6, store it in the case 21, pour a casting resin typically made of two-component epoxy, etc., and solidify it at high temperature to complete the process. It is something.

The first problem is that the case 2o and the casting resin 2
This is done using two parts. Second, casting resin 21
will solidify even if left alone.

It easily absorbs moisture, and even if it absorbs moisture, it is difficult to tell the difference.If you use it while it absorbs moisture, it may be discovered during a check after assimilation is completed, and all the products will be defective, so moisture management is important and difficult. In addition, labor-saving measures such as automation of the production line are difficult, and many tasks rely on human labor. It can cause rashes on the human body, and people with allergies can experience symptoms just by inhaling this gas. Furthermore, air remains in the casting resin 21 due to air being drawn in during stirring of the two-liquid type.

I can't take this away. Another problem is that when casting into the case 20, a large air pocket inevitably remains on the bottom side of the capacitor element 6 and solidifies, making it difficult to distinguish. This is a major factor that promotes the deterioration of ll-1 offspring. Using the casting resin 21 in this way makes it difficult to judge the equipment, workability, and quality of the finished product, which results in large variations.

[Object of the invention and summary of the invention]

The present invention aims to solve the above-mentioned problems and provide a capacitor with stable quality, high mass production, and low cost. After the element 6 is completed, resin molding is performed to surround the entire capacitor element.

[Embodiments of the invention]

To explain this with reference to FIGS. 1 to 6, the capacitor 1 has a terminal 5 that protrudes to the outside with a terminal reinforcing portion 4 that is built up on the outer cover 2, the side surface 3, and the base of the terminal 5. Except for the capacitor element 6, the entire capacitor element 6 is surrounded and molded with resin.

The extended portion of the terminal 5 located in the terminal reinforcing portion 4 forms an uneven portion 9 to prevent the breathing effect between the outside air and the capacitor element 6.

By doing this, case 2o is unnecessary,
Moreover, casting work, which has low productivity, is not necessary. Simply setting the capacitor element in the molding machine is enough to significantly improve productivity and stabilize quality.

Furthermore, the present invention, in which the outer cover is formed by molding, has many additional advantages.

First, when the capacitor element 6 overheats, the content-proboscis erupts at both ends of the film, the so-called metallicon side, damaging the outer cover and allowing outside air to come into contact with the capacitor element, which absorbs moisture and further accelerates the problem. However, as shown in Fig. 4, it is also possible to make the thickness within the thickness of t only at positions where it is easy to blow out. Second, even when capacitor elements are used normally, there is loss, which manifests itself as a rise in temperature.

By suppressing this temperature rise as low as possible, the life of the capacitor can be extended, so heat dissipation fins 13 are installed on the outer cover.
, side fins 14 on the metallcon 7 side can be easily added. Third, the externally protruding terminals 5 may be bent or broken when the capacitor itself is dropped, stored, or carried. To prevent this, a terminal protection wall 19 is installed as shown in Figure 6.
It is also easy to install.

Fourthly, the material of the outer cover itself should be selected according to the purpose, shape, and type.
This means that you can freely change and design it.

Start-up capacitors for washing machine motors and the like are relatively weak in strength, but have a large elongation, change according to changes in ambient temperature, and easily conform to shapes. Furthermore, polypropylene and polyethylene are most suitable because they have low water absorption, are easy to mold, and have little variation. There is no problem even if the material is thermosetting rather than thermoplastic.

The fact that it can be molded to suit the intended use is a major advantage.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the entire capacitor of the present invention, Fig. 2 is a side sectional view of the terminal portion, Fig. 3 is an enlarged perspective view showing the capacitor element and terminal, and Fig. 4 is an application example showing the thin part and the thickness. Figure 5 is a cross-sectional view with a meat part provided, Figure 5 is a cross-sectional view with fins provided to improve heat dissipation characteristics, Figure 6 is a cross-sectional view with a protective wall provided to protect the terminal, and Figure 7 is a view of a conventional example. FIG. 8 is a perspective view of the entire capacitor formed by casting and solidification, and is an internal exposed view with half of the case removed from the perspective view, similar to FIG. 7. No. 11, No. 2, Treetops, No. 3, No. 4, No. 5, Old No. 6, No. 7, Broom, No. 8, Continuation of Page 1, No. 1, No. 11, No. 2, Treetops, No. 3, No. 4, No. 5, Old No. 6, No. 7, Broomsticks, No. 8, Continuation of Page 1, No. 1, No. 11. 0 inventions in the factory Inventor: Kayane-fu 1-1-1 Higashitaga-cho, Hitachi City, Hitachi, Ltd., Taga Factory

Claims (1)

[Scope of Claims] 1. A dry capacitor characterized in that a capacitor element is entirely surrounded and molded with resin to be cut off from outside air. 2. The capacitor according to claim 1, wherein the resin surrounding and molding the capacitor element is a thermoplastic resin. 3. The capacitor according to claim 1, wherein polypropylene, a thermoplastic resin, is used as the resin surrounding and molding the capacitor element. 4. The capacitor element is surrounded and molded with resin, but the thickness around the element is approximately uniform, and only the external connection terminal part is made to protrude and become thicker in order to increase the contact area between the terminal and the resin. The capacitor described in item 1. 5. The capacitor according to claim 1, in which the capacitor element is surrounded and molded with a resin, but the metallic contact sides at both ends of the element are thicker than the other parts, since the content is likely to be blown out in the event of an abnormality in the capacitor element itself. 6. The capacitor according to claim 1, wherein a wall is provided around the external connection terminal portion for protection from external forces. 7. The capacitor according to claim 1, wherein the outer cover formed by surrounding molding of resin is provided with irregularities in order to improve the heat dissipation of self-heating of the capacitor element. 8. The capacitor according to claim 1, wherein the concave and convex portions of the outer cover formed to improve heat dissipation are formed on both sides of the capacitor element on the metallic contact side.