KR20060063418A - Molded case circuit breaker havihg transformation constraint part - Google Patents

Abstract

The present invention relates to a circuit breaker having a strain suppressing portion, the case having an upward opening; A cover coupled to an upper side of the case to form a predetermined internal space; A first stator having one side exposed to the outside of the case so as to be connected to a piezoelectric terminal and fixed to an inner lower end of the case, and formed of a conductor such that a current is induced into the case and flows; An arc extinguishing unit which is stacked on an upper side of the first stator and extinguishes an arc generated when the current flows; A mover coupled to an inner lower end of the case and having one side accommodated in the extinguishing portion and having a current-limiting function; A partition wall extending upward from the bottom surface of the case and spaced apart by a predetermined interval so as to suppress deformation of the case due to an arc generated when the mover is separated from the first stator, and a bottom surface of the case from the partition wall A terminal accommodating part including a strain suppressing part extending in parallel with the at least one of the side wall and the partition wall; It is characterized by including. Thereby, the wiring breaker provided with the deformation | transformation suppression part which can suppress the phenomenon which the said case deforms or is damaged by the high temperature and high pressure arc which generate | occur | produces at the time of a short circuit is provided.

Description

Circuit breaker with strain suppression unit {MOLDED CASE CIRCUIT BREAKER HAVIHG TRANSFORMATION CONSTRAINT PART}

1 is a plan view showing the structure of a conventional circuit breaker;

2 is a perspective view showing the structure of a terminal accommodating portion of a conventional circuit breaker;

3 is a cross-sectional view taken along line III-III of FIG. 2;

4 is a perspective view showing the structure of the terminal accommodating portion of the circuit breaker of the present invention;

5 is a cross-sectional view taken along the line VV of FIG. 4.

** Description of symbols for the main parts of the drawing **

100: wiring breaker 110: case

115: cover 120: terminal accommodating part

121: side wall 130: first stator

140: opening and closing mechanism unit 150: mover

160: sub-unit 161: grid

162: insulation plate 200: deformation inhibiting unit

210: SOHO gas discharge hole 220: combined rib

The present invention relates to a circuit breaker having a strain suppressing portion, and more particularly, to a circuit breaker having a strain suppressing portion capable of suppressing a phenomenon in which a case is deformed or damaged by an arc generated during a short circuit. .

A circuit breaker is an electrical device that protects circuits and loads by automatically cutting off circuits in the event of an electrical overload or short circuit. In general, the electric current flowing through an electric circuit is divided into an electric shock current and an abnormal current flowing when a short circuit or ground fault occurs.

Since the abnormal current is much larger than the electric shock current, it is difficult to cut off the circuit breaker. The circuit breaker is designed to cut off the electric current as well as the abnormal current. To distinguish.

The power system consists of various devices such as generators, transformers, and transmission lines. If you want to stop some of them, disconnect the current from the power system by breaking the current of the generator or transmission line you want to stop. In addition, if a fault such as short circuit or ground occurs in the power system, a large abnormal current flows. If it is left as it is, the damage of the fault is increased and the rest can be broken with a large current. Therefore, a circuit breaker is used to block the fault. In general, the circuit breaker has excellent arc extinguishing ability and the shorter the time it takes to cut off the current, the better the current-limiting performance.

1 is a plan view showing the structure of a conventional circuit breaker, FIG. 2 is a perspective view showing the structure of a terminal accommodating part of a conventional circuit breaker, and FIG. 3 is a cross-sectional view taken along line III-III of FIG.

As shown in these figures, the circuit breaker 100 includes a case 110 having a terminal accommodating part 120 formed on a side thereof with a plurality of sidewalls to accommodate the piezoelectric terminal 300; A cover 115 coupled with the case 110 to form a predetermined internal space; One side is exposed to the terminal accommodating part 120 to be connected to the piezoelectric terminal 300 is fixed to the inner bottom of the case 110, the first formed of a conductor so that the current flows to the inside of the case 110 The stator 130 and the mover 150 that selectively make contact with the first stator 130 through the mechanical operation of the opening / closing mechanism unit 140 through the current flowing through the first stator 130 and the mover 150. ) Is connected to the extinguishing unit 160 for extinguishing the arc generated between the contacts of the first stator 130, the connecting contactor 170 to which one end of the mover 150 is coupled, and the connecting contactor 170. The second stator 180 made of a conductor so as to flow by inducing the current flowing to the outside, and the trip unit 190 and the opening / closing mechanism unit 140 for detecting the occurrence of abnormal current and accident current to operate the opening / closing mechanism 140. ) Is a handle 195 for manually operating.

The case 110 is provided with a constant internal space, various components are arranged in the internal space, and the terminal accommodating part 120 is formed at one side.

The terminal accommodating part 120 is a space formed by a plurality of sidewalls 121 having a predetermined height, and is provided to expose one side of the first stator 130 under the terminal accommodating part 120. The plurality of terminal accommodating parts 120 are divided into a plurality of side walls 121, and the upper side and the lower side are formed through.

The first stator 130 is fixedly mounted on the bottom surface of the case 110, and one side of the first stator 130 is exposed to the outside of the case 110 through the terminal accommodating part 120 so as to be connected to the piezoelectric terminal 300. A screw hole 300 is formed in the center of the first stator 130 exposed to the outside so as to be connected to the piezoelectric terminal 300 by screwing.

The extinguishing unit 160 is disposed on the upper side of the first stator 130, and the extinguishing unit 160 includes a plurality of grids 161 and insulating plates 162 arranged to be spaced apart at regular intervals. do. The grid 161 is stacked and recessed so that one side cross section is bent toward the center of the grid so as to form a space part for arc extinguishing. The insulating plate 162 is fixedly coupled to both sides of the grid 161 so that the grid 161 is spaced apart at a predetermined interval upward.

One end of the mover 150 has a rotational trajectory penetrating one side of the extinguishing unit 160 and is selectively contacted with the first stator 130, and the other end is selectively contacted with the connection contactor 170 to act as a current-limiting function. The connection contactor 170 is coupled to the second stator 180 made of a conductor so that the current flows to the outside, and one side of the second stator 180 is formed on the other side of the case 110. It is fixedly coupled to the inside of the case 110 to be exposed to the outside through the 120.

By the way, in such a circuit breaker 100, the arc of high temperature and high pressure generated during the current flow is discharged to the outside of the circuit breaker 100 through the terminal accommodating portion 120, so that the case 110 by the high temperature and high pressure of the arc There is a problem of deformation and / or damage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker which can suppress a phenomenon in which a case is deformed or damaged by an arc of high temperature and high pressure generated during a short circuit.

The object is, in accordance with the present invention, an upwardly open case; A cover coupled to an upper side of the case to form a predetermined internal space; A first stator having one side exposed to the outside of the case so as to be connected to a piezoelectric terminal and fixed to an inner lower end of the case, and formed of a conductor such that a current is induced into the case and flows; An arc extinguishing unit which is stacked on an upper side of the first stator and extinguishes an arc generated when the current flows; A mover coupled to an inner lower end of the case and having one side accommodated in the extinguishing portion and having a current-limiting function; A partition wall extending upward from the bottom surface of the case and spaced apart by a predetermined interval so as to suppress deformation of the case due to an arc generated when the mover is separated from the first stator, and a bottom surface of the case from the partition wall A terminal accommodating part including a strain suppressing part extending in parallel with the at least one of the side wall and the partition wall; It is achieved by a circuit breaker having a strain suppressing portion, characterized in that it comprises a.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. 4 is a perspective view showing the structure of the terminal accommodating part of the circuit breaker of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4.

However, the same reference numerals will be used for the same parts as the above components, and detailed descriptions thereof will be omitted for clarity.

The circuit breaker including the strain suppressing portion of the present invention includes a case 110 which is upwardly opened; A cover 115 coupled to an upper side of the case 110 to form a predetermined internal space; One side of the first stator is exposed to the outside of the case 110 so as to be connected to the piezoelectric terminal 300 is fixed to the inner bottom of the case 110 and formed of a conductor so that the current flows to the inside of the case 110 130; An arc extinguishing unit 160 stacked on an upper side of the first stator 130 to extinguish an arc generated at the current limit; A movable member 150 rotatably coupled to an inner lower end of the case 110 and having one side accommodated in the extinguishing unit 160 and having a current-limiting function; A partition wall extending upward from the bottom surface of the case 110 and spaced at a predetermined interval so as to suppress deformation of the case 110 due to an arc generated when the mover 150 is separated from the first stator 130 ( 121 and a terminal accommodating part including a strain suppressing part 150 extending parallel to the bottom surface of the case 110 from the partition wall 121 and connected to at least one of the side wall and the partition wall 121; It is configured to include.

The case 110 is provided with a constant internal space, various components are fixedly arranged in the internal space, and the terminal accommodating part 120 is formed at one side.

Meanwhile, the terminal accommodating part 120 is a space formed by a plurality of sidewalls 121 having a predetermined height and is provided to expose one side of the first stator 130 under the terminal accommodating part 120. The plurality of terminal accommodating parts 120 are divided into a plurality of side walls 121. The lower side is penetrated and the upper end part includes a deformation suppressing part 200 interconnecting the side walls and the side walls.

Soho gas discharge hole 210 having a circular cross-sectional shape opened to the side opposite to the insertion direction of the piezoelectric terminal 300 of the deformation suppressing portion 200 is formed through, so that the cover 115 can be inserted and coupled A coupling rib 220 extending along the circumferential surface of the gas discharge hole 210 and protruding in the thickness direction of the case 110 is provided.

By such a configuration, the circuit breaker 100 maintains a state in which the first stator 130 and the mover 150 are in contact with each other in the electric shock current, but when an abnormal current such as an overcurrent or a short circuit current occurs, the first stator The mover 150 is opened by the electron repelling force generated between the 130 and the mover 150 to cut off the current. When the mover 150 is opened, an arc is generated between the first stator 130 and the mover 150, and the generated arc moves to the extinguishing portion 160. The arc is divided by the grid 161 of the extinguisher 160 to raise the arc voltage higher than the power supply voltage to limit the short circuit current, and occurs in the insulating plate 162 for fixing the grid 161 of the extinguisher 160. The arcing effect also produces an arc extinguishing effect that limits the short-circuit current.

The arc of high temperature and high pressure is discharged to the outside of the case 110 through the SOHO gas discharge hole 210 formed at the upper end of the terminal accommodating part 120. The upper end of the side wall forming the terminal accommodating part 120 is a strain suppressing part ( Since it is connected to the 200 to support the side wall 121, deformation or damage of the case 110 due to the high temperature and high pressure arc is suppressed.

As described above, according to the present invention, there is provided a case which is upwardly opened; A cover coupled to an upper side of the case to form a constant internal space; A first stator having one side exposed to the outside of the case so as to be connected to a piezoelectric terminal and fixed to an inner lower end of the case, and formed of a conductor such that a current is induced into the case and flows; An arc extinguishing unit which is stacked on an upper side of the first stator and extinguishes an arc generated when the current flows; A mover coupled to an inner lower end of the case and having one side accommodated in the extinguishing portion and having a current-limiting function; A plurality of partition walls are extended along the case thickness direction to suppress deformation of the case by an arc generated when the mover is separated from the first stator, and the side walls of the case, the partition walls, the partition walls and the A terminal accommodating portion having at least one of the partition walls having a strain suppressing portion interconnected along a plate surface direction of the case; The circuit breaker for wiring provided with the deformation | transformation suppression part which can suppress the phenomenon which the said case deforms or is damaged by the high temperature and high pressure arc which generate | occur | produces at the time of short circuit is provided.

Claims (5)

An upwardly open case; A cover coupled to an upper side of the case to form a predetermined internal space; A first stator having one side exposed to the outside of the case so as to be connected to a piezoelectric terminal and fixed to an inner lower end of the case, and formed of a conductor such that a current is induced into the case and flows; An arc extinguishing unit which is stacked on an upper side of the first stator and extinguishes an arc generated when the current flows; A mover coupled to an inner lower end of the case and having one side accommodated in the extinguishing portion and having a current-limiting function; A partition wall extending upward from the bottom surface of the case and spaced apart by a predetermined interval so as to suppress deformation of the case due to an arc generated when the mover is separated from the first stator, and a bottom surface of the case from the partition wall A terminal accommodating part including a strain suppressing part extending in parallel with the at least one of the side wall and the partition wall; A circuit breaker having a strain suppressing portion, characterized in that it comprises a. The method of claim 1, And the strain suppressing unit is formed by integrally connecting the upper side of the side wall and the partition wall. The method of claim 2, And the deformation suppressing portion is provided with a SOHO gas discharge hole having a circular cross-sectional shape opened in a direction opposite to the insertion direction of the piezoelectric terminal. The method of claim 3, The cover has a circular gas hole through which gas is discharged, and the deformation suppressing portion extends along the circumferential surface of the SOHO discharge hole so as to be coupled to the gas hole of the cover and protrudes along the thickness direction of the case. A circuit breaker having a strain inhibiting portion, characterized in that a coupling rib is formed. The method of claim 4, wherein The coupling rib is a circuit breaker having a strain suppressing portion, characterized in that formed in a circular cross-sectional shape opened in a direction opposite to the insertion direction of the piezoelectric terminal so as to have an elastic restoring force when coupled with the cover.

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