KR20120132329A - Seal for electrolytic condenser and electrolytic condenser - Google Patents

Abstract

PURPOSE: A seal of an electrolytic condenser sealing up an opening part of an electrolytic condenser case and the electrolytic condenser are provided to manufacture the seal of the electrolytic condenser and the electrolytic condenser using the seal, thereby increasing productivity and air-tightness of a condenser. CONSTITUTION: An electrode groove part charging an elastomer(12) is installed on a sealing plate(11). The sealing plate has a ring-shape groove part(14) molded by resin. The elastomer integrated to the ring-shape groove part on the sealing plate is charged and molded. A protruded part(16) is combined with the charged and molded elastomer. The elastomer is sealed up in a case(3) with edges of the case pressed.

Description

Sealing Body for Electrolytic Capacitor and Electrolytic Capacitor {SEAL FOR ELECTROLYTIC CONDENSER AND ELECTROLYTIC CONDENSER}

This invention relates to the sealing body which seals the opening part of the case of an electrolytic capacitor, and the electrolytic capacitor using the sealing body.

An electrolytic capacitor is comprised by accommodating the capacitor | condenser element impregnated with electrolyte solution in the bottomed cylindrical case formed from aluminum etc., and sealing the opening part of this case with the sealing body provided with the electrode. Since airtightness, chemical resistance, and electrical insulation are required for this sealing body, the airtight member which consists of elastic bodies, such as rubber excellent in these characteristics, is used for the sealing part of a sealing body and a case.

As such a sealing body, what laminated | spun the laminated board which bonded the rubber plate for airtight to the whole upper surface of a phenol resin board together, and punched together the magnitude | size of a case opening part was used. However, in this kind of laminated board, since the rubber sheet is laminated to a place which does not require airtightness, besides being cumbersome to manufacture, such as a lamination process and punching of a material, waste of material was large. Therefore, the sealing body which arrange | positioned airtight members, such as a rubber O ring, only in the part which needs airtightness is also proposed.

For example, in Japanese Patent Application Laid-open No. Hei 8-78296, the case is sealed with a seal having an O ring. That is, as shown in FIG. 5, the electrolytic capacitor 1 of this Unexamined-Japanese-Patent No. 8-78296 has the bottom which the upper surface becomes an opening part as for the capacitor element 2 which impregnated the driving electrolyte solution. It is sealed and accommodated in the cylindrical case 3 which exists. This capacitor element 2 is provided with a lead wire 30 as an electrode for connecting an external device or the like to the electrolytic capacitor 1.

The said sealing body 20 has the sealing plate 21 shape | molded by shape | molding thermosetting resins, such as an epoxy resin, and the O-ring 22 which seals the sealing plate 21 and the case 3. That is, the ring-shaped groove part 23 is provided in the outer peripheral part of the sealing plate 21, and the O-ring 22 is arrange | positioned at this groove part 23. As shown in FIG. The lead wire 30 is integrally formed with the sealing plate 21 so as to pass through the sealing plate 21.

The sealing body 20 which has this O-ring 22 is inserted in the opening part of the case 3 which accommodated the capacitor | condenser element 2. As shown in FIG. The opening edge part of this case 3 is curled, it is wound up and is tightened, and the O-ring 22 arrange | positioned at the sealing plate 21 is pressed. This pressing causes the opening edge of the case 3 to dig into the O-ring 22 to maintain airtightness.

On the other hand, the sealing body of Unexamined-Japanese-Patent No. 2002-184656 has a rectangular rubber ring in cross section. This rubber ring is disposed in the groove portion provided in the sealing plate similarly to the O ring of JP-A-8-78296. This rubber ring is adhered to the inner surface of the groove portion by using a liquid adhesive previously injected into the groove portion.

However, just by inserting the O-ring into the groove portion as in Japanese Patent Application Laid-open No. Hei 8-78296, there is a problem that the O-ring shifts or deforms at the time of caulking.

On the other hand, the electrolytic capacitor described in Japanese Patent Application Laid-open No. Hei 8-78296 fixes the rubber ring with an adhesive, so that no deviation or the like during caulking occurs when the O-ring is inserted into the groove. However, depending on the material of a sealing plate, the effect of an adhesive agent may not be exhibited, and selection of a sealing plate is limited. In addition, use of an adhesive becomes a problem in heat resistance and chemical resistance.

The present invention has been proposed to solve the above problems of the prior art. That is, an object of this invention is to provide the sealing body for electrolytic capacitors excellent in airtightness and productivity in the sealing body of an electrolytic capacitor, and the electrolytic capacitor using this sealing body.

The sealing body for electrolytic capacitors of this invention has the following characteristics.

(1) It has the sealing plate which has the annular groove part shape | molded with resin, and the elastic body filled and molded in the annular groove part of this sealing plate.

(2) The said annular groove part is provided with the projection part couple | bonded with the said elastically shape-molded body.

Moreover, this invention also includes the following forms.

(3) The sealing plate has a plurality of electrode holes through which electrodes are inserted, and an electrode groove portion for filling an elastic body is provided on the outer periphery of the plurality of electrode holes, and the protrusion portion for hanging and fixing the elastic body to the electrode groove portion is provided. It is installed.

(4) The sealing plate has a raised portion formed in a direction parallel to the inner surface of the groove portion at a portion of the edge of the groove portion, and the elastic body deforms the raised portion in the center direction of the groove portion to form a protrusion portion.

(5) The said resin is a singio tactile polystyrene resin, and the said elastic body is an elastomer.

(6) The said sealing plate and the said elastic body filled and molded in the groove part of this sealing plate are shape | molded by a 2 material molding machine.

According to the present invention, since the sealing plate and the elastic body are integrated with the molded article and the projections for locking are provided in the grooves of the sealing plate for filling and molding the elastic body, the sealing plate and the elastic body are reliably without using an adhesive agent. It is fixed. As a result, sufficient airtightness can be ensured without causing displacement of the elastic body even when the elastic body and the case are caulked, and heat resistance and chemical resistance due to the absence of adhesives It is possible to provide an excellent electrolytic capacitor.

1 is a cross-sectional view showing the entirety of the electrolytic capacitors of the first and second embodiments.
It is a top view which shows the sealing body of 1st, 2nd embodiment.
3: is sectional drawing of the sealing body of 1st Embodiment, (a) is a sealing plate single body, (b) shows the state which filled and molded the elastic body in the sealing plate.
4: is sectional drawing of the sealing body of 2nd Embodiment, (a) is a sealing plate single body, (b) shows the state which deform | formed the ridge | bulb after filling and sealing an elastic body in the sealing plate.
5 is a cross-sectional view showing the entirety of a conventional electrolytic capacitor.

Hereinafter, each embodiment of this invention is described. In addition, description is abbreviate | omitted about the part same as the prior art shown in FIG.

1. First embodiment

A first embodiment will be described with reference to FIGS. 1 to 3.

(Configuration)

As shown in FIG. 1, the electrolytic capacitor 1 of this embodiment is a condenser element 2, the case 3, the electrode 4 which has a connection terminal for connecting with an external apparatus, and a disk shaped sealing body. Have (10). The sealing body 10 has the sealing plate 11 and the elastic body 12. The sealing plate 11 is formed by injection molding thermoplastic resin as an example. The elastic body 12 is formed by integrally molding the thermoplastic resin on the sealing plate 11 by two-component molding. Two-material shaping | molding is shaping | molding which combines another material and manufactures integrally using the same metal mold | die.

That is, the said sealing plate 11 has a disk shape as shown in FIG. As a thermoplastic resin used as the sealing plate 11, a new geotactical polystyrene resin (SPS) is mentioned. This neo- geotactic polystyrene resin is lightweight, has excellent steam resistance, acid resistance, alkali resistance, fluidity, good mold reproducibility, extremely low dielectric loss, and high heat resistance. In addition, there is the lek (registered trademark) of Idemitsu Kosan Co., Ltd. as this neogeotactic polystyrene resin.

On the other hand, as the elastic body 12, it is preferable that the elastomer of the elasticity rich polymer compound which has thermoplasticity is used. Elastomers having thermoplasticity include EXCELINK (registered trademark) of JSR Corporation.

On the surface of the disk-shaped sealing plate 11, the annular groove 14 is provided along the outer periphery of the sealing plate 11. As shown in the cross-sectional view of FIG. 3, the annular groove 14 has an elliptical cross section along the depth direction. That is, among the edges of the annular groove 14, the projections 16 protruding horizontally toward the center of the groove remain in the edges of the center and the outer circumferential side of the sealing plate 11, and as a result, the annular groove ( The opening portion 14 is narrower than the inside of the groove. In addition, the surface of this protrusion part 16 is the same height as the surface of the sealing plate 11.

On the other hand, the electrode hole 13 through which the electrode 4 penetrates is provided in the center part of the sealing plate 11, and the electrode groove part 15 provided in the outer periphery is provided. In the opening part of this electrode groove part 15, the projection part 16 which faces the groove center is provided. This projection part 16 is provided in the bottom face side rather than the opening edge of the electrode groove part 15, and extends inclined toward the outer surface side of the sealing plate 11. As shown in FIG.

The elastic body 12 is integrated with the sealing plate 11 by filling the annular groove portion 14 and the electrode groove portion 15 of the sealing plate 11. The filling molded elastic body 12 is hooked by the projection 16 provided in the opening of the annular groove 14 and the electrode groove 15.

The manufacturing procedure of the sealing body 10 is demonstrated using FIG. In this embodiment, the sealing body 10 is produced using a 2 material molding machine. First, with a mold for molding the electrode hole 13, the annular groove portion 14, the electrode groove portion 15, and the projection portion 16, a new geotactic polystyrene resin is injected, and the sealing plate 11 is solidified. This is produced.

This sealing plate 11 is a shape shown to Fig.3 (a). That is, the said thermoplastic resin is softened by heating to melting | fusing point, and it is injection-injected to the said metal mold | die. And this cooling geosynthetic polystyrene resin solidifies and becomes the sealing plate 11 by cooling. In addition, the electrode 4 may be molded by insert molding. That is, the electrode 4 is arrange | positioned in advance at the predetermined position, and is made to penetrate into the electrode hole 13, when a new geotactical polystyrene resin is inject | poured into the said metal mold | die.

At this time, as shown in FIG. 3A, the sealing plate 11 is provided with an electrode hole 13, an annular groove 14, an electrode groove 15, and a protrusion 16. Next, while holding the sealing plate 11 with the mold, the mold is moved to a position determined by rotation or the like, for example. In this position, the elastomer overheated to the melting point is injected into the annular groove 14 and the electrode groove 15.

The elastomer injected into the annular groove 14 and the electrode groove 15 is cooled and filled in the entire interior of the annular groove 14 and the electrode groove 15, as shown in FIG. Furthermore, it is caught by the projection part 16 and is integrated with the sealing plate 11.

The sealing body 10 of this embodiment which has the above structure is used in order to seal the opening part of the case 3 in which the capacitor | condenser element 2 was accommodated. Specifically, the tip of the opening portion of the case 3 is curled into a shape as shown in FIG. 1 toward the sealing body 10. At this time, the case 3 is sealed by pressing the elastic body 12 filled in the annular groove 14 of the sealing body 10 at the tip of the opening of the case 3.

(effect)

The electrolytic capacitor 1 of 1st Embodiment has the following effects.

(1) Since the projection part 16 was provided in the annular groove part 14 of the sealing body 10, the elastic body 12 filled and molded in the groove part is caught by this projection part 16 after it solidifies. As a result, even if a pressing force is applied to the elastic body 12 by curling or the like with respect to the tip portion of the case 3, there is no occurrence of misalignment or dropping, and a high sealing can be achieved.

(2) The sealing plate 11 and the elastic body 12 are in close contact with each other via the projections 16, and the close contact state remains firm against the secular variation. Therefore, the highly reliable electrolytic capacitor 1 can be provided.

(3) Since the sealing body 10 and the elastic body 12 are integrally formed, both can be fixed without using an adhesive, so that the sealing body 10 having high heat resistance and chemical resistance can be provided.

(4) Also in the electrode hole 13 through which the electrode 4 of the sealing plate 11 is inserted, the electrode groove portion 15 having the protrusions 16 is similar to the sealing with the case 3 of the electrolytic capacitor 1. ) Is filled with a thermoplastic elastomer and sealed. That is, the electrode 4 can be in close contact with the elastomer filled in the electrode groove 15 and have a high sealing property. Furthermore, since the elastomer is hung from the protrusion 16, there is no deviation or dropout, so that the electrode ( 4) and the tightly sealed state of the sealing plate 11 is held for a long time.

2. Second Embodiment

A second embodiment will be described using FIG. 4. In addition, since the structure shown in FIG. 1, FIG. 2 is the same as that of 1st Embodiment, description is abbreviate | omitted.

(Configuration)

In the sealing plate 11 of this embodiment, as shown to Fig.4 (a), the ridge 17 which becomes the protrusion 16 after a deformation | transformation is provided in the edge part of each groove part. This raised part 17 is formed in the direction parallel to the inner surface of the said groove part in the edge part of the annular groove part 14 and the electrode groove part 15. As shown in FIG. That is, the ridge 17 is roughly upright above the opening of the grooves 14 and 15 so that the ridge 17 is raised relative to the sealing plate 11. Therefore, in the state which formed the sealing plate 11, it differs from what narrowed opening like the said 1st Embodiment, and the opening part of each groove part 14 and 15 is equal to the width | variety of each groove part 14 and 15. FIG. It is done.

The sealing plate 11 of this embodiment which has this raised part 17 is produced using 2 material forming machines similarly to 1st Embodiment. First, a new geotactic-polystyrene resin heated and melted to the melting point is injected into a mold including the electrode hole 13, the annular groove 14, the electrode groove 15 and the ridge 17. The sealed resin is solidified and the sealing plate 11 shown to Fig.4 (a) is produced. In addition, also in this embodiment, the electrode 4 may be shape | molded by insert molding similarly to 1st Embodiment. In this case, in the present embodiment, the ridge 17 is approximately upright above the opening of the grooves 14 and 15. Therefore, since the opening part of a groove part becomes wide and there is no so-called undercut, the metal mold | die for forming the groove parts 14 and 15 can be easily removed from within a groove part.

Next, similarly to the first embodiment, the superheated elastomer is injected to fill the annular groove 14 and the electrode groove 15. Prior to filling the elastomer, first, the ridge 17 is pressed in a part of the mold. By the collapse process, the projections 16 as shown in FIG. 4B are formed in the edges of the annular groove 14 and the electrode groove 15 in the same manner as in the first embodiment before charging.

The elastomer injected into the annular groove portion 14 and the electrode groove portion 15 in this manner is cooled similarly to the first embodiment, and as shown in FIG. 4B, the annular groove portion 14 and the electrode groove portion The whole inner surface of 15 is covered, and it is caught by the projection part 16, and is integrated with the sealing plate 11. The process of pressing and crushing the raised portion 17 may be after the elastomer formed by filling the annular groove portion 14 and the electrode groove portion 15 formed in the sealing plate 11 is cooled and solidified.

(effect)

In this embodiment, after removing the metal mold | die which forms each groove part from a groove part, the protruding part 16 of the sealing plate 11 is deformed and the protrusion part 16 is formed. Thus, when removing a metal mold | die from a groove part, since the protrusion which becomes an undercut does not exist in a groove part, the shape of a metal mold | die can be made simple. In addition, after the molding, the protrusions 16 can securely hold the elastic body, so that the elastic body 12 and the sealing body 10 which are elastomers can be firmly integrated.

3. Other embodiment

This invention is not limited to the said embodiment, but also contains other embodiment as follows.

(1) Although the sealing plate 11 of embodiment is formed from the neo- geotactic polystyrene resin, it is not limited to this.

(2) Although the elastic body 12 of embodiment is an elastomer, it is not limited to this. The elastic body 12 should just be a compound rich in the elasticity which has thermoplasticity, and rubber etc. can also be used.

(3) Although the shaping | molding of the sealing body 10 of embodiment uses the 2 material shaping | molding machine, it is not limited to this. For example, you may use the molding machine separate from the shaping | molding of the sealing plate 11, and the filling of the elastic body 12 to the groove part 14 and 15 of this sealing plate 11, respectively.

(4) In embodiment, although the structure which has the high sealing property between the sealing plate 11 and the electrode 4 by providing the electrode groove part 16 is not limited to this. For example, the sealing plate 11 and the electrode 4 may be integrally formed without providing the electrode groove 16, or the airtightness may be secured using other sealing means.

1: electrolytic capacitor
2: condenser element
3: case
4: electrode
10: sealing member
11: sealing plate
12: elastomer
13: electrode hole
14: annular groove
15: electrode groove
16: protrusion
17: ridge
20: sealing body
21: sealing plate
22: O ring
23: O-ring groove
30: lead part

Claims (6)

It is a sealing material used for an electrolytic capacitor,
It has a sealing plate which has the annular groove part shape | molded with resin, and the elastic body integrally filled by the annular groove part of this sealing plate,
The said annular groove part is provided with the protrusion part couple | bonded with the said elastically shape | molded molded body, The sealing body for electrolytic capacitors characterized by the above-mentioned. The said sealing plate has a some electrode hole which an electrode penetrates, and the electrode groove part which fills an elastic body in each outer periphery of this some electrode hole is provided, and this electrode groove part is provided with this elastic body. A protrusion for electrolytic capacitors, characterized in that a protruding portion for fastening is provided. The said sealing plate has the ridge | bulb part raised with respect to the said sealing plate in the edge part of the said groove part,
The protrusion is formed by deforming the ridge in the direction of the center of the groove after the elastic body is filled in the groove. The sealing body for an electrolytic capacitor according to claim 1, wherein the resin is a singiotactic polystyrene resin, and the elastic body is an elastomer. The sealing body for an electrolytic capacitor according to claim 1, wherein the sealing plate and the elastic body filled and molded into the groove portion of the sealing plate are molded by a two-material molding machine. The sealing body of Claim 1,
The capacitor | condenser element is accommodated and provided with the case sealed by the said sealing body, The electrolytic capacitor characterized by the above-mentioned.

Images