KR101018129B1 - Method for making arc chamber and power breaker having the arc chamber - Google Patents

Abstract

PURPOSE: A method for manufacturing an arc chamber and a power circuit breaker with an arc chamber are provided to reduce the size of the power circuit breaker by forming an electrode on a ceramic box. CONSTITUTION: A switch contact(22) in an arc chamber is integrated with a connection terminal(23) outside the arc chamber in an electrode(20). A penetration hole(12) which passes through the middle between both ends of the electrode is formed on a ceramic insulation box(10). The ceramic insulation box forms an arc extinguish chamber whose one side is open. Metal rising paste is coated around the penetration hole and the open inlet edge of the ceramic insulation box. The metal rising is thermally processed in a range of 1300 to 1500 degrees centigrade. The metal rising part is plated with metal and is sintered. A brazing metal(14) is positioned on the open inlet edge of the plated ceramic insulation box and is attached with the metal intermediate material for sealing the arc chamber. The disk type brazing metal is positioned on the plated penetration hole inlet and is combined with the electrode to be thermally processed.

Description

Method for making arc chamber and power breaker having the arc chamber

The present invention relates to a method of manufacturing an arc chamber of a circuit breaker and a power circuit breaker having the arc chamber manufactured.

In electrical circuits, switches are used to supply or disconnect electricity, which are called switches, breakers, relays, and the like.

Breakers used to cut large currents have different capacity and types depending on the nature of the circuit to be cut. Especially in circuit breakers with mechanical electrodes that block large currents flowing in inductive loads, when the large currents flowing from two electrodes are interrupted, an arc may occur to damage the electrode and heat it, or particles that fall off the electrode may be surrounded by parts or materials. Attached to the field, there is a problem that degrades performance or causes a failure.

Various methods are used to eliminate (armor) these arcs generated when the current is interrupted. In breakers, relays, brakes, etc. (hereafter referred to as breakers), the current blocking contact and the enclosed space around it are called arc chambers.The breaker of the arc chamber filled with insulating oil is called an inlet breaker (OCB). The arc inert gas is called a gas circuit breaker (GCB), and there are products called air circuit breakers, magnetic circuit breakers, vacuum circuit breakers, and the like.

SOHOs cover the casing in small switches, but in switch breakers with large arcs, the arc chamber is sealed to minimize the effect of the arc on the outside of the chamber.

Patent application No. 10-1995-0003597 discloses the reduction of the generation of metal and free carbon emitted from internal components of a switch when an arc occurs during the opening and closing of a contact of a switch having an arc removing chamber or the aforementioned metal and the above-mentioned free carbon. Arc insulation material that suppresses the deterioration of the insulation resistance in the arc elimination chamber, around the arc elimination chamber, and the case inner wall of the switchgear during arc generation and arc elimination, and arc elimination during and after arc elimination. The switchgear is open. In the publication of this application, a circuit breaker quickly removes an arc from an arc switch that generates an arc when the current is interrupted, such as a current limiter or a magnetic contactor, and then removes the arc from the arc removal chamber, around the arc removal chamber, and inside the case of the switch. It explains that the fall of insulation resistance of a wall surface can be suppressed.

Patent application 10-1991-21497 discloses a contact material for a vacuum interrupter, which combines excellent high current interruption characteristics and wear resistance, and meets the requirements of a vacuum interrupter used in harsh conditions. This contact material is composed of Ag, Cu, and combinations thereof. The content of highly conductive components selected from the group consisting of Ag-Cu is 25-70 vol percent of the total amount of Ag-Cu, and the content of protective components is 30-75 vol percent. At least one of each carbide of one element selected from the group consisting of Hf, V, Nb, Cr, Mo, and W, and the contact material has a resistance component of 0.1-1 micrometer having an average particle diameter of 0.3-3 micrometer. It exists in the structure which maintains an average interparticle distance.

In patent application 10-2004-19049, a compound extinguishing type gas installed in a substation, a switching station, etc., which extinguishes an arc generated between arc contacts when conducting normal current and generating a fault current by insulating gas SF ₆ . In the breaker of the circuit breaker, an expansion chamber is provided on one side of the popper cylinder, which is separated from the popper cylinder, connected to the expansion chamber, and a heat-gas flow path that sends the heat-gas expanded by the arc to the expansion chamber, and is connected to the popper cylinder. And an expansion chamber-type gas shutoff unit in which an expansion chamber and a popper cylinder are separated, wherein the expansion chamber and the popper cylinder are separated from each other.

Application No. 20-1977-3527 discloses a known vacuum container in which a predetermined amount of gas is enclosed in order to solve the problem of the vacuum circuit breaker, at least one pair of electrodes supported in the vacuum container, and is installed in the vacuum container, and stores the supply gas. Therefore, the vacuum opening and closing device provided with the gas supply apparatus which discharge | releases gas when the gas pressure in a vacuum container falls below predetermined pressure is disclosed.

Application Nos. 10-2001-9305, 10-2001-6722, 10-2001-5971 filed by the present applicant discloses a barrel type electroplating apparatus, a plating method using the same, and a jig and barrel type plating apparatus for electroplating. This is about the technique of electroplating a certain part of the insulator. For example, the rotating barrel type electroplating apparatus according to the present invention is agitated and mixed with a plating solution of a plating bath in a rotating barrel type electroplating apparatus in order to improve the plating thickness uniformity and plating efficiency when plating nickel on the surface of the non-conductive plating material. A rotating barrel type electroplating apparatus for plating by plating, comprising: a barrel in which a plating body is accommodated, a rotating means for rotating the barrel at a predetermined speed in a plating solution, and a plating solution contained in the barrel simultaneously with the plating solution It includes a plurality of dummy electrodes to be stirred and mixed, and the plating method is the inside of the barrel using a rotating barrel type electroplating apparatus in which the plating to be plated is accommodated in the barrel and stirred while mixing in the plating solution of the plating bath. The plurality of dummy electrodes housed in the plate are stirred and mixed with the plated body at the same time for plating.

Conventional circuit breakers need to be miniaturized because they are bulky with respect to their breaking capacity, and high reliability circuit breakers do not cause problems such as overheating and breakdown or no arcing even when repeated opening and closing is made more reliable than conventional circuit breakers. In need.

In particular, there is a need for a circuit breaker that has a long lifespan and adapts well to the severe load condition in which a large DC current must be repeatedly cut off as in an electric vehicle.

It is necessary to miniaturize the electrode structure and the driving mechanism for the opening and closing operation and to put it in a small arc chamber to reduce the weight and miniaturization.

It is an object of the present invention to provide a sub-chamber chamber and a method of manufacturing the same, which can achieve high reliability and miniaturization of a circuit breaker required in the prior art.

The present invention is to provide an insulator arc chamber and a method of manufacturing the same that can be used in the gas circuit breaker, vacuum circuit breaker and inlet circuit breaker as well as the air circuit breaker by forming an electrode integrally formed in the ceramic enclosure.

In particular, the present invention aims to provide a circuit breaker that has a long life and is well adapted to a severe load condition in which a DC high current must be repeatedly cut off as in an electric vehicle.

The purpose of the present invention is to provide an arc chamber in which the dielectric strength due to the arc is not easily degraded, and which can firmly accommodate the miniaturized electrode and the driving mechanism.

In the method of manufacturing the arc chamber of the present invention, an electrode in which a switch contact to be located in the arc chamber and a connection terminal to be located outside the arc chamber are integrated, and a through hole through which an intermediate portion between both ends of the electrode is formed is formed. Preparing an insulation housing to form an open side chamber space, a metallizing step of applying a metallizing paste at a predetermined width around the opening of the through-hole of the insulation enclosure, and heat-treating it in a range of 1300 to 1500 degrees Celsius, and metal Plating step of plating the metal and heat treatment (sintering) the rise, and the brazing step of placing the disk-shaped brazing metal at the inlet of the plated through-hole and then bonding the electrode and then heat-treating.

The present invention also performs the metallizing step and the plating step of the open side inlet edge of the insulated enclosure, and in the brazing step, the brazing metal is placed on the open inlet edge of the insulated enclosure and the brazing metal intermediate material for the arc chamber is brazed together. You may do it.

The insulating enclosure of the present invention is preferably formed of a ceramic insulator. In particular, the insulating enclosure comprises Al ₂ O ₃ : SiO ₂ in a weight ratio of an aluminum oxide powder having a particle size of 30 to 60 micrometers, a purity of 99% or more, and a silicon oxide powder. = (90 to 99 wt%): mixed with (1 to 10 wt%), the mixed powder is molded into an insulator shape by a molding press, and the prepared insulation is prepared by sintering in the range of 1400 ~ 1600 degrees Celsius will be.

The power circuit breaker of the present invention includes an arc chamber manufactured by such a manufacturing method.

According to the manufacturing method of the present invention, it is possible to manufacture a fire extinguishing chamber capable of achieving high reliability and miniaturization of the circuit breaker required in the prior art.

The ceramic insulator of the present invention can be a small insulator arc chamber that can be used in the gas circuit breaker, vacuum circuit breaker and inlet circuit breaker as well as the air circuit breaker by forming the electrode integrally to seal the extinguishing chamber.

Even in the severe load condition where the DC large current must be repeatedly cut off as in an electric vehicle, an insulation chamber is not easily deteriorated, and an arc chamber capable of robustly accepting a miniaturized electrode and driving mechanism can be provided.

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

Fig. 1 is a sectional view of the arc chamber of this embodiment, and Fig. 2 is a bottom view thereof.

In the arc chamber of the present invention, the electrode 20 is coupled in a sealing structure to a ceramic frame, which is an insulator 10, and a metal intermediate 18 is attached as necessary.

The frame insulated enclosure in the form of a square or circular box with an open mouth is an insulator, and the electrode 20 is a conductor.

The contact 22 of the electrode 20 is attached to one end of the connection terminal (terminal) 23, and the screw 24 is formed at the other end of the terminal so that an electric wire or a conductor can be easily connected.

A through hole 12 is formed in the insulation housing 10, and a metallization part 16 is formed at the entrance of the through hole to the outside of the enclosure, and a metal disk 14 for brazing is attached thereto. It is brazed and sealed with the next electrode.

The open inlet of the enclosure 10 also has a metallizing portion 16, and the brazing metal 14 is placed therein so that the metal intermediate 18 is brazed and sealed. This metal intermediate material 18 is the part to be sealed together with the cover after the circuit breaker driving mechanism is inserted.

In the method of manufacturing such an arc chamber, first, an electrode 20 having a switch contact 22 to be located in the arc chamber and a connection terminal 23 to be located outside the arc chamber are prepared. The connection terminal is made of copper with good electrical conductivity, and the contact 22 is made of metal, molybdenum, tungsten, and the like, which are known for the contact, and are made of a material having high melting point and good electrical conductivity.

In addition, the insulating housing 10 is prepared, which has a through hole through which an intermediate portion between both ends of the electrode 20 passes, and has an inlet open at one side.

The method of manufacturing the insulation enclosure is Al ₂ O ₃ : SiO ₂ = (90 ~ 99 wt%): (Aluminum oxide powder having a particle size of 30 to 60 micrometers, a purity of 99% or more, and a silicon oxide powder in a weight ratio: 1 to 10 wt%), and the mixed powder is dissolved in water and bind, and granulated into a particle size of about 100 microns with a spray dryer machine. Sintered in the range of 1400 ~ 1600 degrees Celsius to prepare an insulation enclosure.

In another embodiment, the aluminum oxide Al ₂ O ₃ powder (90 to 99 wt%), silicon oxide SiO ₂ powder (1 to 10 wt%), manganese oxide having a purity of 99% or more having a particle size of 30 to 60 micrometers MnO ₂ powder (1 to 8 wt%) Magnesium Oxide MgO powder (1 to 5 wt%) is mixed, and the mixed powder is dissolved in water and bind to small particles of about 100 microns in a spray dryer, and then It is better to press and press and shape into an insulation enclosure shape, and to sinter the molded body in the range of 1400 to 1600 degrees Celsius to produce an insulation enclosure.

The combination of the insulation enclosure and the electrode shall be done in the following manner.

Metallizing paste is applied around the inlet opening of the insulation enclosure in a constant width and heat-treated in the range of 1300 to 1600 degrees Celsius to form the metallized portion.

The metallized part is subjected to a plating process of nickel plating and heat treatment (sintering) as a metal plating example. The heat treatment is in the range of approximately 780 to 900 degrees, and may be plated with a metal other than nickel.

The brazed metal in the form of a disk is attached to the plated portion, and then the electrodes are joined and brazed by heat treatment in the range of 780 to 900 degrees Celsius. At this time, the metallized part for attaching the metal intermediate material is also metalized together at the inlet edge of the open side of the insulated enclosure, and the metallization is applied to the metallized part, and then the brazing metal is placed at the open inlet edge of the insulated enclosure and the arc chamber is sealed. Brazing the metal intermediate together.

The power circuit breaker according to the present invention may be coupled to a ceramic contact with the moving contact connecting the two electrodes in the enclosure together with the drive mechanism in the enclosure and brazed with a metal intermediate material. In this case, the mobile contact or driving mechanism is already known, so this known product can be used, but it may be designed to fit the entrance of the enclosure and the accommodation space of the enclosure.

When sealing together with these switching mechanisms, a gas breaker is injected when the gas such as sulfur hexafluoride is injected and sealed, and an air circuit breaker when sealed in the atmosphere at atmospheric pressure, and a vacuum circuit breaker when vacuumed and sealed.

In particular, it can be used in conjunction with a heat sink to dissipate the switch mechanism in order to adapt well to the severe load conditions that must be repeated and cut off the DC high current as in electric vehicles.

1 is a cross-sectional view of the arc chamber of this embodiment;

2 is an arc chamber bottom view.

Explanation of Major Symbols in Drawings

10: ceramic insulation enclosure, frame, 20: electrode, 18: metal intermediate

22: switch contact, 23: connection terminal, 12: through hole

16: metallized and plated, 14: brazing metal

Claims (6)

A method of manufacturing an arc chamber of a circuit breaker containing two or more mechanical contacts for interrupting current, An electrode having an integrated switch contact to be located in the arc chamber and a connecting terminal to be located outside the arc chamber, and a through hole through which an intermediate portion between the both ends of the electrode is formed, and a ceramic to form an arc chamber space having one side open. Preparing an insulation enclosure; A metallizing step of applying a metallizing paste at a predetermined width around the opening of the through hole of the ceramic insulation enclosure and at the edge of the open one side of the opening, and heat-treating the temperature in the range of 1300 to 1500 degrees Celsius; A plating step of metal plating and heat treatment (sintering) the metallized part, Brazing step of placing the brazing metal at the open inlet edge of the plated ceramic insulation enclosure, attaching the metal intermediate material for arc chamber sealing, placing the brazing metal in the form of a disk at the inlet of the plated through hole, and then joining the electrodes, followed by heat treatment. Arc chamber manufacturing method comprising a. delete delete The method according to claim 1, wherein the ceramic insulation housing, Particle size 30 ~ 60 mitrometer, purity 99% or more of aluminum oxide Al ₂ O ₃ powder: silicon oxide SiO ₂ powder in a weight ratio of (90 ~ 99 wt%): (1 ~ 10 wt%) mixed, The mixed powder is molded into a ceramic insulation enclosure shape by a molding press, Arc chamber manufacturing method characterized in that the manufactured ceramic insulation enclosure is produced by sintering in the range of 1400 ~ 1600 degrees Celsius. The method according to claim 1, wherein the ceramic insulation housing, Particle size 30 to 60 micrometers, aluminum oxide Al ₂ O ₃ powder with purity over 99%: silicon oxide SiO ₂ powder: manganese oxide MnO ₂ powder: magnesium oxide MgO powder in weight ratio (90 ~ 99 wt%): (1 to 10 wt%): (1 to 8 wt%): (1 to 5 wt%), and the mixed powder is dissolved in water and bind and mixed, The mixed powder is molded into a ceramic insulation enclosure shape by a molding press, Arc chamber manufacturing method characterized in that the manufactured ceramic insulation enclosure is produced by sintering in the range of 1400 ~ 1600 degrees Celsius. A power circuit breaker having an arc chamber manufactured by the manufacturing method as defined in any one of claims 1, 4 and 5.

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