KR20150029165A

KR20150029165A - Circuit breaker

Info

Publication number: KR20150029165A
Application number: KR20130107979A
Authority: KR
Inventors: 홍승표
Original assignee: 엘에스산전 주식회사
Priority date: 2013-09-09
Filing date: 2013-09-09
Publication date: 2015-03-18

Abstract

The circuit breaker according to the present invention simplifies the short circuit breaker by providing an instantaneous coil around the gap adjusting screw provided in each trip bar and by inserting the gap adjusting screw into the instantaneous coil to cut off the single current, And the breaker can be downsized. In addition, it is possible to cut off the short circuit current when it is energized, thereby preventing the spread of accidents, thereby reducing the loss of property.

Description

Breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a circuit breaker in which a coil is installed around a gap adjusting screw so that a gap adjusting screw acts as a core to quickly increase a breaking speed of a short circuit current.

Generally, the circuit breaker can be classified into a wiring breaker and an earth leakage breaker. MCCBs are industrial electrical equipment used for the purpose of shutting off the converter when an overload or short-circuit occurs in order to protect the wires or to open or close the load. In addition to the function of the circuit breaker, the circuit breaker is a miniature circuit breaker with the function to cut off the converter within the specified operating time when a short circuit, electric shock, or ground fault occurs.

1 is a front view showing an interior of a miniature circuit breaker among conventional circuit breakers.

As shown in the drawing, the conventional miniature circuit breaker includes a case 10 forming an internal space, a power source side connecting portion 12 disposed on one side of the case 10, and a load device A stator 21 connected to the power source side connecting portion 12, a mover 31 disposed so as to be in contact with and spaced apart from the stator 21, and a mover 31 connected to the mover 31, And the movable member 31 is tripped away from the stator 21 in association with the opening and closing member 40 while being thermally deformed when an overcurrent is generated, And a bimetal 51 for cutting off.

The opening and closing device 40 is provided on the upper surface of the case 10 with an on position where the mover 31 and the stator 21 are brought into contact with each other and an on position where the mover 31 is separated from the stator 21 A handle 41 connected to the handle 41 for pushing the mover 31 upon input of the handle 41 so that the mover 31 is brought into contact with the stator 21, A trip bar 45 for allowing the handlebar 41 to be in a closed state when the handle 41 is in contact with one end of the lever 43 connected to the handle 41, And a spring 47 for applying a spring force.

One side of the bimetal 51 is connected to the mover 31 so as to be energizable, and the other side extends upward and is spaced apart from the trip bar 45 by a predetermined distance. The mover 31 and the bimetal 51 are connected to the power source side connection part 12 by the first lead wire 53. The bimetal 51 is curved and deformed toward the trip bar 45 when the overcurrent flows, The lever 43 restrained by the trip bar 45 is restrained by the trip lever 45 so that the handle 41 is rotated to the shutting position. On the other hand, a magnetic body 55 is provided at one side of the bimetal 51 so that the bimetal 51 is attracted toward the trip bar 45 by the magnetic force generated when short-circuit current is energized.

In the conventional circuit breaker as described above, the bimetal 51 is curved to the trip bar 45 side due to the resistance heat, and the bimetal 51 is deformed by the attractive force of the magnetic body 55 by the magnetic force generated by the energization of the short- And is attracted toward the magnetic body to press the trip bar 45 to release the restraint of the lever 43. [ The crossbar 44 and the mover 31 are moved upward by the elastic force of the spring 47 to block the short circuit current.

However, in this case, since the bimetal 51 is formed of a material having a low magnetic susceptibility, there is a limit in shortening the time for driving the trip bar 45 when the short-circuit current is supplied. It is required to shorten the time until the trip bar 45 is driven because the damage to the property and human life due to short-circuit current energization can be greatly increased if the time until the trip bar 45 is driven.

In view of this, as shown in FIG. 2 and FIG. 3, the "wiring breaker (hereinafter, referred to as a line registered)" filed on December 29, 2006 and registered on June 16, 2008 by the present applicant, A plurality of instantaneous coils 71 connected to the load side connecting part 14 of the phase coil 51 and the other side connected to the load side connecting part 14 of the phase coil 51, And a shaft 75 for pressing and tripping the branching end portion 45a of the short-circuit current interruption portion 45 is provided.

The shortcircuit current blocking portion 70 includes an instantaneous coil 71 disposed on one side of the bimetal 51, a bobbin 72 disposed on the inside of the instantaneous coil 71, One end of the movable core 74 is connected to the fixed core 73 and the movable core 74 and the other end of the fixed core 73 is connected to the corresponding branched end 45a of the trip bar 45 through the bimetal 51, And a shaft 75 disposed at a predetermined spacing. A plate-shaped first yoke 76 is disposed at one end of the bobbin 72. A second yoke 77 is coupled to the outer side of the bobbin 72 and the opposite side of the first yoke 76. [ A fixed core 73 is fixedly disposed on the inner side of the bobbin 72 and a movable core 74 is disposed on a side of the fixed core 73 at a predetermined distance. A return spring 78 is provided between the fixed core 73 and the movable core 74 to apply an elastic force to the movable core 74 so as to be spaced apart from the fixed core 73. In the figure, reference numeral 46 denotes a gap adjusting screw, and 79 denotes a second conductor connecting the instantaneous coil and the load side connecting portion.

3, when the short-circuit current of several tens to several hundreds times the rated current flows due to an accident or the like, the instantaneous registered coil circuit breaker 71 is instantaneously driven in addition to the thermal drive of the bimetal 51, And the movable core 74 is moved toward the direction in which the magnetic resistance decreases, that is, to the fixed core 73 side. As a result, the shaft 75 is moved toward the trip bar 45 and strikes the trip bar 45, so that the trip bar 45 is rotated in the clockwise direction in the figure, so that the trip operation is continuously performed.

However, as described above, the above-mentioned pre-registered wiring breaker for a wiring breaker is configured such that the shortcircuit breaking portion 70 is in contact with the instantaneous coil 71, the bobbin 72, the fixed core 73, the movable core 74, The first yoke 76, the second yoke 77, and the box spring 78, which increases the number of components, thereby increasing the manufacturing cost of the circuit breaker, There is a problem that the assembling process is complicated and the area occupied by the assembly is widened to increase the volume of the circuit breaker.

It is an object of the present invention to provide a circuit breaker that can simplify the short circuit breaker to reduce the manufacturing cost, reduce the weight and size, and reduce the size while simplifying the assembly process.

In order to achieve the object of the present invention, A mover which contacts and separates from the stator while rotating; A handle for opening and closing the mover with respect to the stator; A trip bar coupled to the handle so as to maintain an engaged state when the handle is turned on; A bimetal connected to the mover to press and trip the trip bar while being curved in an overcurrent state; A first magnetic member coupled to one end of the trip bar to adjust an interval between the trip bar and the bimetal; And an instantaneous coil provided around the first magnetic member and having both ends electrically connected to the power source side connecting portion and the load side connecting portion so that the magnetic member is sucked in an overcurrent so that the trip bar rotates in a trip position direction A breaker may be provided.

A second magnetic member may be coupled to the other end of the trip bar, and the second magnetic member may be electrically connected to the mover.

One end of the instantaneous coil may be connected to the bimetal by a first conductor, and the other end of the instantaneous coil may be connected to a power source side or a load side connection portion by a second conductor.

The first conductor may be formed of a flexible material, and the second conductor may be formed of a solid material to support the instantaneous coil.

The breaker according to the present invention is provided with an instantaneous coil around the gap adjusting screw provided in each trip bar so that the gap adjusting screw is sucked by the instantaneous coil to cut off the single current so that the short circuit breaker is simplified, It can be downsized. In addition, it is possible to cut off the short circuit current when it is energized, thereby preventing the spread of accidents, thereby reducing the loss of property.

1 is a sectional view showing a conventional wiring breaker,
Fig. 2 is a sectional view showing a circuit breaker registered in advance; Fig.
Fig. 3 is a sectional view showing a breaking operation in the wiring breaker according to Fig. 2,
4 is a sectional view showing an example of a wiring breaker according to the present invention,
FIG. 5 is a sectional view showing a breaking operation in the wiring breaker according to FIG. 4,
6 is a sectional view showing another embodiment of the short circuit breaker in the circuit breaker according to FIG.

Hereinafter, a breaker according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 4 is a sectional view showing an example of a wiring breaker according to the present invention, and FIG. 5 is a sectional view showing a breaking operation in the wiring breaker according to FIG.

As shown in the figure, the breaker according to the present embodiment has power supply side connecting portions 112 for each power supply to be connected to one side of the case 110, and each side load connecting portion 114 May be formed. A stator 121 is fixedly mounted on each of the power source side connection portions 112. Stator 121 is rotatably supported on each stator 121 so as to be able to open and close the power source by contact with and separation from the stator 121 Can be installed. An opening / closing device 140 may be installed on the upper side of the mover 131 to manually open / close the power source.

The opening and closing device 140 includes a handle 141 disposed on the upper surface of the case 110 so as to be exposed to the outside and a crossbar 144 interlocked with the handle 141 to allow the mover 131 to contact the stator 121, A trip bar 145 for preventing the handle 141 from rotating to the off position when the handle 141 is turned to the on position and a stop bar 145 for restoring the cross bar 144 to the initial position A spring 147 may be included.

The lever 143 connected to the handle 141 presses the crossbar 144 and the crossbar 144 presses the mover 131 downward by rotating the handle 141 to the input position, 131 are brought into contact with the stator 121 and energized. At this time, the trip bar 145 restrains the lever 143, so that the handle 141 is kept in the closed state.

The bimetal 151 may be connected to each of the mover 131 so that the overcurrent exceeding the standard can be detected and automatically cut off the power supply. Each of the bimetals 151 is disposed at a predetermined distance on one side of the branching end 146 of the trip bar 145 branched by each phase so that the bimetal 151 is separated from the corresponding one of the trip bars 145 The base end 145a is pressed so that the mover 131 is separated from the stator 121 by a trip operation.

A gap adjusting screw 146 may be provided at the upper end of the trip bar 145 to adjust the gap with the bimetal 151. The gap adjusting screw 146 may be formed of a magnetic material so as to be sucked depending on whether or not the instantaneous coil 171 is magnetized.

An instantaneous coil 171 for rotating the trip bar 145 in the trip position direction may be provided around the gap adjusting screw 146 by suctioning the gap adjusting screw 146, have. One side of the instantaneous coil 171 may be connected to the bimetal 151 by a first lead 176 and the other side may be connected to the load side connecting portion 114 by a second lead 177.

The first conductor 176 is formed of a flexible material because the bimetal 151 is deformed while being curved by heat while the second conductor 177 is formed of a hard material such as a copper wire so as to support the instantaneous coil 171. [ May be preferably formed.

Meanwhile, the instantaneous coil 171 may be supported by the second conductor 177 as shown in FIG. 4, but it may be fixed to the case using a separate bobbin or bracket.

The circuit breaker according to the present embodiment as described above has the following operational effects.

That is, when the overcurrent exceeding the standard is passed through the breaker, the bimetal 151 is curved toward the trip bar 145 and presses the branched end 145a. 5 so that the lever 143 restrained by the trip bar 145 is released from restraint so that the crossbar 144 returns to the initial position by the elastic force of the spring 147. [ And the mover 131 is separated from the stator 121 to block the overcurrent.

On the other hand, when a short-circuit current of several tens to several hundreds of times the rated current flows due to an accident or the like, the instantaneous coil 171 instantaneously generates a magnetic driving force, and the gap adjusting screw 146 moves in the inner direction of the instantaneous coil 171 As shown in FIG. 6, the gap adjusting screw 146 is moved toward the trip bar 145 to pull the corresponding branched end 145a of the trip bar 145 so that the trip bar 145 rotates clockwise in FIG. 5 So that the trip operation is continuously performed.

In this way, the instantaneous coil is provided around the gap adjusting screw provided in each trip bar, and the gap adjusting screw is sucked by the instantaneous coil, thereby simplifying the short circuit breaker, thereby reducing manufacturing cost and miniaturizing the circuit breaker. In addition, it is possible to cut off the short circuit current when it is energized, thereby preventing the spread of accidents, thereby reducing the loss of property.

Meanwhile, in the above-described embodiments, the trip bar is rotated through a thermal driving method using a bimetal, a magnetic driving method using a gap adjusting screw and an instantaneous coil. In this embodiment, however, the mover 131 and the bimetal The magnetic member 177 for magnetic driving may be further provided on the fastening member B to which the first and the second magnetic members 151 are coupled.

The magnetic body 177 is folded in the shape of a tourmaline and one end of the magnetic body 177 contacts the bimetal 151 to be fastened to the fastening member B and the other end thereof can be engaged with the trip bar 145.

In this case, the thermal drive by the bimetal 151 and the attraction by the magnetic force of the instantaneous coil 171, as well as the driving by the magnetic force of the magnetic body 178, are added to the short-circuit current, Can be rotated more quickly.

110: Case 112: Power supply side connection
114: load side connection part 121: stator
131: Mover 140: Opener bending
141: handle 144: crossbar
145: trip bar 146: gap adjustment screw
147: spring 151: bimetal
170: short circuit breaker 171: instantaneous coil
176: first conductor 177: second conductor
178:

Claims

Stator;
A mover which contacts and separates from the stator while rotating;
A handle for opening and closing the mover with respect to the stator;
A trip bar coupled to the handle so as to maintain an engaged state when the handle is turned on;
A bimetal connected to the mover to press and trip the trip bar while being curved in an overcurrent state;
A first magnetic member coupled to one end of the trip bar to adjust an interval between the trip bar and the bimetal;
And an instantaneous coil provided around the first magnetic member and having both ends electrically connected to the power source side connecting portion and the load side connecting portion so that the magnetic member is sucked in an overcurrent so that the trip bar rotates in a trip position direction breaker.

The method according to claim 1,
And a second magnetic member is coupled to the other end of the trip bar, and the second magnetic member is electrically connected to the mover.

3. The method according to claim 1 or 2,
Wherein one end of the instantaneous coil is connected to the bimetal by a first conductor and the other end of the instantaneous coil is connected to a power source side or a load side connection portion by a second conductor.

The method of claim 3,
Wherein the first conductor is formed of a flexible material and the second conductor is formed of a solid material to support the instantaneous coil.