KR20010056055A - Vacuum interrupter having brahing layer made of bonding insulator and Seal Cup - Google Patents

Vacuum interrupter having brahing layer made of bonding insulator and Seal Cup Download PDF

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Publication number
KR20010056055A
KR20010056055A KR1019990057465A KR19990057465A KR20010056055A KR 20010056055 A KR20010056055 A KR 20010056055A KR 1019990057465 A KR1019990057465 A KR 1019990057465A KR 19990057465 A KR19990057465 A KR 19990057465A KR 20010056055 A KR20010056055 A KR 20010056055A
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South Korea
Prior art keywords
brazing
layer
seal cup
vacuum interrupter
thickness
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KR1019990057465A
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Korean (ko)
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KR100323745B1 (en
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김병욱
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이종수
엘지산전 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/66215—Details relating to the soldering or brazing of vacuum switch housings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/66223—Details relating to the sealing of vacuum switch housings

Abstract

PURPOSE: A vacuum interrupter having an insulation container and seal cup bonded brazing layer is provided to reduce a stress and prevent a crack from being generated by increasing brazing thickness between a ceramic insulation container and a seal cup and absorbing the stress, which is caused during a brazing, by the brazing thickness. CONSTITUTION: A metalizing layer and a Ni layer are consecutively formed on an upper surface of a ceramic insulation container. A seal cup is brazed on the insulation container. A surface of the Ni layer which is formed on the upper surface of the metalizing layer becomes uneven, so as to make thickness of a filer being heavier during a brazing. A vacuum interrupter has a brazing layer which is formed by bonding the insulation container and the seal cup. The unevenness of the surface of the Ni layer is formed by a coating with Ni powder or by using a pattern when Ni is plated, so as to have a surface roughness of 3S to 100s. The insulation container is Al2O3 and the seal cup is Ni-Co-Fe alloy.

Description

절연통과 씨일컵(Ｓｅａｌ Ｃｕｐ)을 접합한 브레이징층을 갖는 진공인터랩터{Vacuum interrupter having brahing layer made of bonding insulator and Seal Cup}Vacuum interrupter having brahing layer made of bonding insulator and Seal Cup}

본 발명은 진공차단기의 진공인터랩터(Vacuum Inerrupter)의 절연통과 씨일컵의 브레이징(Brazing)에 관한 것으로, 특히 세라믹인 절연통과 씨일컵의 브레이징시 브레이징 두께를 증가시킴으로써, 응력(Stress) 발생의 억제로 신뢰성 확보를 갖는 진공인터랩터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to brazing of an insulating pass seal cup of a vacuum interrupter of a vacuum circuit breaker. In particular, by increasing the brazing thickness during brazing of an insulating pass seal cup, which is a ceramic, suppressing stress generation The present invention relates to a vacuum interceptor having reliability.

진공차단기(Vacuum circuit Breaker)의 핵심 부품인 진공인터랩터는 도 1과 같이, 세라믹으로된 절연통(1), 쉴드(Shield)(2), 리테이너(Retainer)(3), 벨로우즈 (Bellows)(4), 씨일컵(Seal Cup)(5), 접점(6)과 전극(7), 부싱가이드(Bushing Guide) (8)등으로 구성된다.As shown in FIG. 1, the vacuum interrupter, which is a core component of the vacuum circuit breaker, is made of a ceramic insulator (1), a shield (2), a retainer (3), and bellows ( 4) a seal cup 5, a contact 6 and an electrode 7, a bushing guide 8, and the like.

상기 구조에서 절연통(1)은 알루미나(Al2O3) 세라믹으로 되어 있고, 상기 절연통(1)과 브레이징(Brazing)되는 씨일컵(Seal Cup)은 Al2O3와 유사한 코바(Kovar) (Ni-Co -Fe 계 합금) 등의 재질로 조성되어 있다.In the above structure, the insulating tube 1 is made of alumina (Al 2 O 3 ) ceramic, and the seal cup brazing with the insulating tube 1 is a Kovar similar to Al 2 O 3 . It is made of a material such as (Ni-Co-Fe alloy).

그리고 상기 절연통(1)과 씨일컵(5)의 브레이징은 도 2와 같이, 세라믹으로된 절연통(1)상면에 씨일컵과 브레이징이 되게하기 위해 메탈라이징(Metallizing)층(세라믹과 금속과의 봉착을 위해 세라믹 표면에 순금속분말 또는 활성화 Mo-Mn합금분말을 도포하여 가열)이 형성되고, 그 위에 브레이징의 흐름을 좋게 하기 위해 Ni도금층을 입힌다.And the brazing of the insulating cylinder (1) and the seal cup (5) is a metalizing layer (ceramic and metal) in order to be brazed with the seal cup on the upper surface of the ceramic insulating cylinder (1) as shown in FIG. For the purpose of sealing, a pure metal powder or an activated Mo-Mn alloy powder is applied to the surface of the ceramic and heated), and a Ni plating layer is coated thereon to improve the flow of brazing.

이어서 상기 메탈라이징층과 Ni도금층이 형성된 절연통(1)에 씨일컵 (5)이 접합될 수 있게 Ag-Cu재료를 사용하여 800℃ 전후로 브레이징하여 냉각한다.Subsequently, it is cooled by brazing around 800 ° C. using an Ag—Cu material so that the seal cup 5 may be bonded to the insulating cylinder 1 on which the metallization layer and the Ni plating layer are formed.

상기한 구조에서는 절연통과 씨일컵 사이의 브레이징에 따른 응력을 줄이기 위하여 열팽창 계수가 유사한 Fe- Ni 합금인 Kovar재질을 많이 사용하고 있으나, Fe-Ni합금은 부식이 잘되기 때문에 Ni도금을 한다. 그러나 도금의 신뢰성이 나쁠때 부식이 발생하며 이로 인해 진공인터랩터에 기밀이 없어져 진공이 소멸되는 불량이 발생한다.In the above structure, in order to reduce the stress due to brazing between the insulating tube and the seal cup, Kovar material, which is a Fe-Ni alloy having a similar thermal expansion coefficient, is used a lot, but the Fe-Ni alloy is Ni-plated because it is well corroded. However, when the plating reliability is poor, corrosion occurs, which causes the vacuum interceptor to have no airtightness and thus a defect in which the vacuum disappears.

한편 상기한 부식 및 고가(高價)인 재질 등의 문제점을 해결하기 위하여 그 재질을 스테인레스로 변경하여 적용하려는 경향이 있으나, 스테인레스와 알루미나 세라믹은 열팽창 차이가 커서 응력을 더 많이 받게되고, 응력이 큰 세라믹이나 씨일컵 두 재질중 어느 재질이 균열(Crack)이 발생하여 신뢰성을 저하시키는 등 진공인터랩터 내부의 진공이 소멸되기도 한다.On the other hand, in order to solve the above problems such as corrosion and expensive materials, the material tends to be changed to stainless, but stainless and alumina ceramics are more stressed due to the large thermal expansion difference, and have a high stress. The vacuum inside the vacuum interceptor may disappear, such as ceramic or seal cup, which causes cracks to degrade reliability.

본 발명은 상기한 종래의 문제점을 해결하기 위한 것으로, 세라믹인 절연통과 씨일컵 사이의 브레이징 두께를 증대시킴으로써, 브레이징시 발생되는 응력을 브레이징 두께가 흡수하여 응력이 저감된 균열 발생이 없는 브레이징층을 갖게하는데 그 목적이 있다.The present invention is to solve the above-mentioned problems, by increasing the brazing thickness between the insulating tube and the seal cup of the ceramic, the brazing layer absorbs the stress generated at the time of brazing, so that the stress is reduced, there is no cracking brazing layer The purpose is to have.

도 1은 진공인터랩터의구조도1 is a structural diagram of a vacuum interceptor

도 2는 절연통과 씨일의 브레이징 상태를 나타낸 구조도2 is a structural diagram showing a brazing state of an insulation pass seal;

도 3은 도 2 구조에 대해 냉각시 열팽창을 나타낸 상태도Figure 3 is a state diagram showing the thermal expansion during cooling for the Figure 2 structure

도 4a는 절연통과 씨일 접합시 브레이징 두께를 두껍게한 상태도4A is a state in which the brazing thickness is thickened when the insulated through seal is bonded;

도 4b는 절연통과 씨일 접합시 브레이징 두께를 얇게한 상태도4b is a state in which the brazing thickness is thinned when the insulated through seal is bonded;

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

1 : 절연통 5 : 씨일컵1: insulated container 5: seal cup

상기한 목적을 달성하기 위한 본 발명은 세라믹으로된 절연통의 상면에 메탈라이징(Metallizing)층과 Ni층이 순차적으로 형성되고, 상기 형성된 절연통에 씰일컵을 브레이징하여서된 구조를 포함한 진공인터랩터에 있어서, 메탈라이징층 상면에 형성되는 Ni층 표면을 요철되게 하여 브레이징층 두께를 두껍게하는 것을 특징으로 하는 진공인터랩터의 절연통과 씨일컵(Seal Cup)의 브레이징(Brazing)방법으로 구성된다.The present invention for achieving the above object is a vacuum integrator including a structure formed by sequentially forming a metalizing layer (Metallizing) and Ni layer on the upper surface of the ceramic insulator, brazing the seal work cup in the formed insulator In the brazing method of the insulating pass seal cup (Seal Cup) of the vacuum interlayer, characterized in that the thickness of the brazing layer is thickened by making the surface of the Ni layer formed on the upper surface of the metallization layer thick.

상기와 같이 구성된 본 발명은 알루미나 세라믹과 씨일컵 사이의 브레이징층의 두께를 증가시켜 응력을 줄이기 위한 것으로, 브레이징층의 두께를 두껍게 하기 위하여 메탈라이징 위의 Ni층 표면을 요철되게 하는 것으로는 Ni분말을 코팅하거나Ni도금시 패턴(Pattern)을 사용하여 3S∼100S 표면조도의 요철이 되게 제작함으로써 브레이징시 필러(Filler)를 두껍게 할 수 있다.The present invention configured as described above is to reduce the stress by increasing the thickness of the brazing layer between the alumina ceramic and the seal cup, Ni powder to make the surface of the Ni layer on the metallization to thicken the thickness of the brazing layer. When coating or by using Ni patterning (Pattern) by using the 3S to 100S surface roughness to make the filler can be thickened (Filler) during brazing.

상기한 본 발명은 세라믹인 절연통과 씨일컵 사이의 브레이징 두께를 두껍게 하여 열팽창에 의해서 응력을 받을 때 도 3과 같이 브레이징 재질이 흡수하고 일부 응력만 잔류하게 된다. 그리고 씨일컵이 절연통보다 열팽창계수가 크면(일반적으로 씨일컵이 세라믹인 절연통보다 열팽창계수가 큼)열팽창계수 차이로 f의 응력을 받게되며 결합 부분인 브레이징 부분과 금속부분에서 소성변형이 일어나거나, 세라믹인 절연통이 브레이징부나 씨일컵부의 소성변형 강도 보다 약할 때는 절연통에 균열이 발생한다.In the present invention, the brazing material is absorbed as shown in FIG. If the seal cup has a larger coefficient of thermal expansion than the insulated cylinder (generally, the cup has a larger coefficient of thermal expansion than the ceramic insulated cylinder), the stress is affected by f due to the difference in the coefficient of thermal expansion, and plastic deformation occurs in the brazing part and the metal part. Alternatively, when the ceramic insulator is weaker than the plastic deformation strength of the brazing part or the seal cup part, the insulator is cracked.

그래서 세라믹인 절연통의 두께를 두껍게하여 보완 할 수도 있지만 두께를 증기시키는 것은 진공인랩터 체적과 코스트(Cost)면에서 좋지 않다. 그리고 씨일컵의 강도를 낮게하여 보완하는 방법이 있으나 인터랩터의 전체 강도에 좋지 않다. 따라서 본 발명에서는 도 4a와 같이 Ag-Cu 브레이징층의 두께를 두껍게하여 브레이징층에서 소성변형량을 증가시켜서 응력 흡수량을 증가 시킬 수 있는 것이다.Therefore, it is possible to compensate by increasing the thickness of the ceramic insulator, but vaporizing the thickness is not good in terms of the vacuum inflator volume and cost. And there is a way to compensate by lowering the strength of the seal cup, but it is not good for the overall strength of the interlator. Therefore, in the present invention, as shown in FIG. 4A, the thickness of the Ag-Cu brazing layer is increased to increase the amount of plastic deformation in the brazing layer, thereby increasing the amount of stress absorption.

이것은 소성변형 강도가 절연통(Al2O3세라믹)＞씨일컵(Fe-Ni, 스테인레스)＞브레이징(Ag-Cu)필러(Filler)이므로 도 4a의 경우 브레이징 두께 t가 커서 응력 f를 받을 때 t두께 방향으로 단위 길이 당 변형량은 도 4b보다 적어서 단위 길이 당 소성 변형량은 적어지며, 단위 길이 당 변형량이 적어지므로 단위 길이 당 가공 경화량도 작아진다.This is because the plastic deformation strength is insulated cylinder (Al 2 O 3 ceramic)> seal cup (Fe-Ni, stainless)> brazing (Ag-Cu) filler, so in the case of FIG. In the t-thickness direction, the amount of deformation per unit length is smaller than that of FIG.

가공경화는 재질의 강도를 증가시키므로 저항할 수 있는 강도도 증가되고, 저항할 수 있는 강도 만큼 응력을 더 많이 받게 된다. 그러므로 브레이징 두께가 두꺼우면 응력을 적게 받게되는 것이다.Work hardening increases the strength of the material, so that the strength that can withstand is increased, and the stress is increased as much as the strength that can withstand. Therefore, a thick brazing thickness results in less stress.

상기한 본 발명은 브레이징층의 두께 증가로 응력의 흡수량이 많아지는 것을 알수 있고 브레이징층의 두께를 증가시키기 위해서는 브레이지 워셔(Braze Washer) 두께를 증가시켜도 브레이징시 필러(Filler)의 흐름성 문제로 두꺼운 브레이징층을 얻을 수 없으나, 본 발명에서는 메탈라이징층위의 Ni층의 두께를 콘트롤하기 위해 20∼200μm 크기의 Ni 분말을 메탈라이징위에 코팅하고 소결하여 요철형상을 갖는 Ni표면층을 얻을 수 있고, 이것에 브레이징 함으로써 기존 도금 방식의 브레이징 두께의 100∼160% 정도의 브레이징 두께를 얻을 수 있었다.The present invention can be seen that the increase in the amount of stress absorption due to the increase in the thickness of the brazing layer, in order to increase the thickness of the braze layer (braze washer) to increase the thickness of the filler (Filler) during brazing problems Although a thick brazing layer cannot be obtained, in the present invention, in order to control the thickness of the Ni layer on the metallizing layer, a Ni surface layer having a concave-convex shape can be obtained by coating and sintering Ni powder having a size of 20 to 200 μm on the metallizing layer. By brazing in, the brazing thickness of about 100 to 160% of the conventional plating brazing thickness was obtained.

이상에 따라 기존과 같이 Ni 도금하여 요철이 없게하는 경우는 절연통에 10% 전후의 균열이 발견되었으나, 메탈라이징층위에 Ni 분말을 코팅하여 요철이되게 하거나, Ni 도금시 패턴을 사용하여 표면조도를 3S∼100S로 요철되게 제작함으로써, 이를 이용한 브레이징시 필러(Filler)를 두껍게할 수 있어 균열의 발생이 없는 씨일컵 및 절연통을 갖는 접합층을 얻을 수 있다.According to the above, when Ni plating is used to eliminate the irregularities as before, cracks around 10% were found in the insulating tube, but the Ni powder is coated on the metallizing layer to form the irregularities, or the surface roughness using a pattern during Ni plating. By unevenly producing 3S to 100S, it is possible to thicken the filler during brazing using the same, thereby obtaining a bonding layer having a seal cup and an insulating tube without cracks.

이상에서와 같이 본발명은 세라믹으로된 절연통의 상면에 메탈라이징 (Metallizing)층을 형성하고 , 그 상면에 Ni분말을 코팅하여 요철이 되게하거나, Ni 도금시 패턴을 사용하여 3S∼100S 표면조도를 갖는 요철 형태가 되도록하여, 상기 절연통과 씨일컵의 브레이징시 필러(Filler) 두께를 두껍게할 수 있음으로써절연통 및 씨일컵의 균열 발생 억제로 신뢰성 있는 진공인터랩터를 얻을 수 있다.As described above, the present invention forms a metalizing layer on the upper surface of the ceramic insulator and coats the Ni powder on the upper surface so as to be uneven, or by using a pattern during Ni plating, 3S to 100S surface roughness. By forming a concave-convex shape, the thickness of the filler during the brazing of the insulating pass seal cup can be increased, thereby obtaining a reliable vacuum interrupter by suppressing the occurrence of cracks in the insulating pass seal and the seal cup.

Claims (3)

세라믹으로된 절연통의 상면에 메탈라이징(Metallizing)층과 Ni층이 순차적으로 형성되고, 상기 형성된 절연통에 씰일컵을 브레이징하여서된 구조를 포함한 진공인터랩터에 있어서, 메탈라이징층 상면에 형성되는 Ni층 표면을 요철되게 하여 브레이징시 필러(Filler)두께가 두껍게 되도록 하는 것을 특징으로 하는 절연통과 씨일컵(Seal Cup)을 접합한 브레이징(Brazing)층을 갖는 진공인터랩터.The metallization layer and the Ni layer are sequentially formed on the upper surface of the ceramic insulator, and the vacuum interrupter including the structure formed by brazing a seal work cup on the insulated tube is formed on the upper surface of the metallization layer. A vacuum interrupter having a brazing layer bonded to an insulating tube and a seal cup, characterized in that the Ni layer surface is irregular to make the filler thickness thick during brazing. 제 1항에 있어서,The method of claim 1, Ni표면의 요철이 Ni 분말의 코팅에 의하여 이루어지거나 또는 Ni 도금시 패턴을 사용하여 3S∼100S의 표면조도를 갖게 하여 이루어지게 함을 특징으로 하는 절연통과 씨일컵(Seal Cup)을 접합한 브레이징(Brazing)층을 갖는 진공인터랩터.Brazing insulated through seal cup (Seal Cup) characterized in that the unevenness of the Ni surface is made by coating of Ni powder or having a surface roughness of 3S to 100S by using a Ni plating pattern. Vacuum interlayer having a brazing layer. 제 1항에 있어서,The method of claim 1, 절연통이 알루미나(Al2O3)이고, 씨일컵이 Ni-Co-Fe계합금인 것을 특징으로 하는 절연통과 씨일컵(Seal Cup)을 접합한 브레이징(Brazing)층을 갖는 진공인터랩터.A vacuum interrupter having a brazing layer in which an insulating tube and a seal cup are bonded to each other, wherein the insulating tube is alumina (Al 2 O 3 ) and the seal cup is a Ni-Co-Fe alloy.
KR1019990057465A 1999-12-14 1999-12-14 Vacuum interrupter having brahing layer made of bonding insulator and Seal Cup KR100323745B1 (en)

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Publication number Priority date Publication date Assignee Title
KR101018129B1 (en) * 2009-11-13 2011-02-25 주식회사 한국전자재료 Method for making arc chamber and power breaker having the arc chamber

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JPS56156626A (en) * 1980-05-06 1981-12-03 Meidensha Electric Mfg Co Ltd Vacuum breaker
JPH06150788A (en) * 1992-11-12 1994-05-31 Mitsubishi Electric Corp Vacuum valve
JPH07288070A (en) * 1994-04-19 1995-10-31 Mitsubishi Electric Corp Vacuum valve
JPH0822752A (en) * 1994-07-06 1996-01-23 Toshiba Corp Vacuum valve
JPH1092276A (en) * 1996-09-18 1998-04-10 Shibafu Eng Kk Vacuum valve and its manufacture

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101018129B1 (en) * 2009-11-13 2011-02-25 주식회사 한국전자재료 Method for making arc chamber and power breaker having the arc chamber

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