Sealing member for capacitor

Abstract

Disclosed is a sealing member for a capacitor, in which a sealing plate and an elastic ring are integrally manufactured by multi-material injection molding to improve uniformity of quality and ease of assembly.

Description

Sealing member for capacitor

[0001] The present invention relates to a sealing member for a capacitor in which the sealing plate and the elastic ring are integrally manufactured by heterogeneous injection molding to improve quality uniformity and assembly.

[0002]

[0003] Generally, the sealing member of the capacitor is composed of a sealing plate (10) and an elastic ring (20) as shown in FIG. 1, and serves to seal the upper part of the case in which the internally housed element is housed.

[0004]

[0005] At this time, the sealing member first injects the connection terminal (30), then inserts the connection terminal (30) into the mold using a normal insert injection method, and then injects the sealing plate (10). At this time, the sealing plate is injected so that a recessed groove (11) is formed on the upper edge.

[0006]

[0007] Then, after separately injection molding the elastic ring (20) to be assembled into the recessed groove (11), the sealing member was inserted into the top of the case by inserting the sealing plate (10) into the top of the case and then fitting the elastic ring (20) into the recessed groove (11) of the sealing plate when sealing the top of the case. Afterwards, the top of the case was curled so that the curled end pressures the elastic ring to ensure airtightness.

[0008]

[0009] In a sealing member in which the sealing plate (10) and elastic ring (20) are manufactured separately, the sealing plate and elastic ring must be assembled separately during assembly, which not only increases the assembly cost but also takes a long time to assemble, resulting in a problem of reduced price competitiveness.

[0010]

[0011] The present invention has been devised to solve the above problems, and its purpose is to provide a sealing member for a capacitor that improves quality uniformity and assembly by manufacturing the sealing plate and the elastic ring as a single unit through heterogeneous injection molding.

[0012]

[0013] The objective of the present invention can be achieved by providing a sealing member for a capacitor comprising a case; an element housed inside the case; and a sealing member that seals the upper part of the case, wherein the sealing member is manufactured by heterogeneous injection molding of a sealing plate and an elastic ring in a single mold after inserting a connection terminal, and wherein the sealing plate has a recessed groove formed on its upper edge and the elastic ring is integrally injection molded into the recessed groove.

[0014]

[0015] The sealing member for a capacitor according to the present invention has the effect of improving quality uniformity and assembly by integrally manufacturing the sealing plate and the elastic ring through heterogeneous injection molding.

[0016]

[0017] FIG. 1 is an exploded perspective view of a conventional sealing member for a capacitor, and

[0018] FIG. 2 is a perspective view of a sealing member for a capacitor according to the present invention, and

[0019] FIG. 3 is a cross-sectional view of a capacitor with a sealing member according to the present invention applied.

[0020]

[0021] Hereinafter, a sealing member for a capacitor according to the present invention will be described in detail with reference to the attached drawings.

[0022]

[0023] FIG. 2 attached is a perspective view of a sealing member for a capacitor according to the present invention, and FIG. 3 is a cross-sectional view of a capacitor to which the sealing member according to the present invention is applied.

[0024]

[0025] Referring to the drawings above, the capacitor according to the present invention includes a case (1) as shown in FIG. 3. An element (2) is accommodated inside the case (1), and the upper side is sealed by a sealing member (100).

[0026]

[0027] Here, the sealing member (100) is manufactured by inserting a connection terminal (130) and then injection molding a sealing plate (110) and an elastic ring (120) in a single mold, wherein the sealing plate (110) has a recessed groove (111) formed on its upper edge and the elastic ring (120) is integrally injection molded into the recessed groove (111).

[0028]

[0029] Here, the connection terminal (130) is inserted into a mold to be electrically connected to the element (2) and is formed integrally with the sealing member.

[0030]

[0031] In this way, when the upper side of the case (1) is sealed with the sealing member (100), the upper part of the case (1) is curled so that the bent upper part (3) presses against the elastic ring (120), thereby sealing the inside of the case.

[0032]

[0033] Since the sealing member for a capacitor according to the present invention, configured as described above, is manufactured integrally by heterogeneous injection molding of the sealing plate and the elastic ring in a single mold, the inconvenience of having to manufacture and assemble them separately as in the past is eliminated, thereby improving assemblability, ensuring uniform quality, and shortening assembly time, which enhances product competitiveness.

[0034]

[0035] Meanwhile, the sealing plate is preferably formed from a sealing plate composition composed of 50-60% by weight of glass fiber, 0.2-0.5% by weight of carbon black, and the remainder being phenolic resin.

[0036]

[0037] In this case, other additives may be included to improve moldability, such as defoaming agents, fillers, plasticizers, and lubricants. However, since these are not essential components of the present invention, a description is omitted.

[0038]

[0039] The reason for forming with such a sealing plate composition is that the sealing plate (110) must ensure airtightness, chemical resistance, electrical insulation, and pressure resistance.

[0040]

[0041] In this case, glass fiber contributes to securing electrical insulation and pressure resistance.

[0042] In addition, carbon black contributes to enhancing chemical resistance, electrical insulation, and pressure resistance.

[0043]

[0044] In addition, phenolic resin is a synthetic polymer obtained by the reaction of phenol or phenol substituted with formaldehyde, and it has excellent mechanical strength, machinability, dimensional stability, and heat resistance, as well as excellent electrical insulation, solvent resistance, and acid resistance, and in particular, it has the characteristic of maintaining rigidity even at high temperatures and being resistant to creep.

[0045]

[0046] Additionally, in the present invention, based on 100 parts by weight of the sealing plate composition, 10 parts by weight of isohexadecane, 12.5 parts by weight of sodium xylene sulfonate, 5.5 parts by weight of n-BMA (n-Butyl methacrylate), 10 parts by weight of methyl ethyl ketoxime, and 5.8 parts by weight of 5-isopropyl-3-methylphenol may be further added.

[0047]

[0048] In this case, isohexadecane contributes to enhancing heat resistance, heat insulation, pressure resistance, and airtightness.

[0049]

[0050] In addition, sodium xylene sulfonate is a substance corresponding to CAS No: 1300-72-7, and contributes to increased heat resistance, airtightness, and pressure resistance.

[0051]

[0052] In addition, n-BMA (n-Butyl methacrylate), also known as 2-propenoic acid, is an organic synthetic material that enhances elongation and flexural strength, contributing to the suppression of cracks and fissures.

[0053]

[0054] In addition, methyl ethyl ketoxime is a substance corresponding to CAS No: 96-29-7, which has excellent water and heat resistance and, in particular, contributes to increased chemical resistance and chemical resistance due to film formation.

[0055]

[0056] In addition, triphenylphosphine increases binding strength by increasing crosslinking ability and contributes to increasing water resistance, tear resistance, impact resistance, as well as heat resistance, chemical resistance, and insulation.

[0057]

[0058] Furthermore, the elastic ring is preferably manufactured from EPDM, but in order to ensure weather resistance, chemical resistance, chemical resistance, and deformation resistance, it is preferable to mold it with an elastic ring composition formed by adding 10 parts by weight of 2-amino-2-methyl-1-propanol, 5.5 parts by weight of 1,2-hexanediol, and 10 parts by weight of 1,3,5-triglycidyl isocyanurate to 100 parts by weight of EPDM.

[0059]

[0060] At this time, 2-amino-2-methyl-1-propanol is a substance corresponding to CAS No. 124-68-5, which controls viscosity and enhances water resistance, corrosion resistance, and heat resistance.

[0061]

[0062] In addition, 1,3,5-triglycidyl isocyanurate is a substance corresponding to CAS No. 2451-62-9, and contributes to enhancing heat resistance, impact resistance, and tear resistance.

[0063]

[0064] In particular, when composing the elastic sheet composition of the present invention, based on 100 parts by weight of EPDM, 5.5 parts by weight of 2-pyrrolidone, 10 parts by weight of epoxysilane, 5.5 parts by weight of sodium metasilicate, 4.5 parts by weight of ethylene bis stearamide, and 5 parts by weight of sodium polyacrylate may be further added.

[0065]

[0066] In this case, 2-pyrrolidone is a substance corresponding to CAS No. 616-45-5 that strengthens binding force, inhibits deformation, and contributes to increasing chemical resistance and weather resistance.

[0067]

[0068] Furthermore, epoxysilane contributes to ensuring water resistance (a property of the coating film that resists acid action and does not change easily), that is, acid resistance, weather resistance, chemical resistance, and drug resistance.

[0069]

[0070] In addition, sodium metasilicate contributes to suppressing delamination, interfacial spalling, and crack formation.

[0071]

[0072] In addition, ethylene bis stearamide contributes to increasing dispersibility, suppressing discoloration, and increasing surface smoothness.

[0073]

[0074] In addition, sodium polyacrylate provides dispersion power, inhibits aggregation, and enhances dispersibility, contributing to the improvement of the uniformity of the molded structure.

[0075]

[0076] The sealing member for a capacitor according to the present invention is manufactured by integrating a sealing plate and an elastic ring through heterogeneous injection molding, thereby improving the airtightness and durability of the sealing part and simplifying the assembly process. Accordingly, the present invention is applicable to various types of capacitor manufacturing processes and can be particularly usefully utilized in the production of electrolytic capacitors, film capacitors, etc., used in electronic devices, communication devices, automotive electronic components, industrial control devices, etc. Furthermore, since the integral molded structure improves quality uniformity and production efficiency during mass production, it can be widely used industrially throughout the electronic component manufacturing industry.

Claims

1. A sealing member for a capacitor that seals the upper part of a case in which an element is housed internally, A sealing member for a capacitor, characterized in that the sealing member is manufactured by inserting a connection terminal and then performing heterogeneous injection molding of a sealing plate and an elastic ring in a single mold, wherein a recessed groove is formed on the upper edge of the sealing plate and the elastic ring is integrally injection molded into the recessed groove.

2. In Paragraph 1, The above sealing plate is a sealing member for a capacitor characterized by being molded from a sealing plate composition consisting of 50-60% by weight of glass fiber, 0.2-0.5% by weight of carbon black, and the remainder being phenolic resin, thereby ensuring airtightness, chemical resistance, electrical insulation, and pressure resistance.

3. In Paragraph 1, A sealing member for a capacitor, characterized in that the above elastic ring is manufactured from EPDM, and is formed from an elastic ring composition comprising 10 parts by weight of 2-amino-2-methyl-1-propanol, 10 parts by weight of 1,2-hexanediol, 5.5 parts by weight of 1,3,5-triglycidyl isocyanurate, and 10 parts by weight of 1,3,5-triglycidyl isocyanurate, based on 100 parts by weight of EPDM.

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