KR101427800B1

KR101427800B1 - Trip unit for molded case circuit breaker

Info

Publication number: KR101427800B1
Application number: KR1020100133681A
Authority: KR
Inventors: 안병수
Original assignee: 엘에스산전 주식회사
Priority date: 2010-12-23
Filing date: 2010-12-23
Publication date: 2014-08-08
Also published as: KR20120071937A; CN102543602A; CN102543602B

Abstract

The present invention relates to a trip unit of a wiring breaker. The trip unit of the present wiring breaker includes a magnetic core for generating a magnetic force when power is applied thereto; An armature rotatably disposed on one side of the magnetic core; And an armature spring that applies an elastic force to the armature in a direction away from the magnetic core so as to suppress an increase in a moment acting on the armature when the armature is sucked by the magnetic core. Thereby, even when the attraction force of the magnetic core is moderate, the instantaneous trip operation can be smoothly performed.

Description

[0001] TRIP UNIT FOR MOLDED CASE CIRCUIT BREAKER [0002]

The present invention relates to a trip unit of a circuit breaker, and more particularly, to a trip unit of a circuit breaker which can reduce an uncertainty period of instantaneous operation to ensure a constant instantaneous characteristic.

As is well known, a circuit breaker for a wiring breaker can be operated by manually opening and closing a power circuit of a relatively low voltage by using an operation handle, detecting an occurrence of a fault current such as a short circuit current, It is a kind of device.

FIG. 1 is a cross-sectional view of a conventional wiring breaker, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3 is a view for explaining the operation of the trip unit of FIG. 2, FIG. 1, the circuit breaker for wiring comprises a case 10, a stationary contactor 20 fixedly disposed on the case 10, and a stationary contactor 20 disposed so as to be contactable and detachable with respect to the stationary contactor 20 A movable contactor 30, an opening / closing mechanism 40 for opening and closing the movable contact 30, and a trip unit 50 for detecting and automatically shutting off a fault current when a fault current is generated.

An operation handle may be provided in the upper region of the case 10 to manually open and close the opening / closing mechanism 40.

The stationary contactor 20 may be fixedly disposed inside the case 10 so as to be connected to a busbars and / or a load. The stationary contactor 20 may include a plurality of stationary contacts 22 spaced from each other.

A movable contact 30 may be provided on one side of the fixed contact 20 so as to be contactable with and detachable from the fixed contact 22. The movable contact 30 may include a plurality of movable contacts 32 which can be in contact with the fixed contacts 22, respectively. A shaft 35 may be provided in a central region of the movable contact 30.

On the other hand, the trip unit 50 may be provided on one side of the fixed contact 20 so as to automatically trip (trip) when a fault current is detected.

The trip unit 50 includes a magnetic core 51 electrically connected to the stationary contactor 20 to generate a magnetic force when energized, a magnetic core 51 disposed on one side of the magnetic core 51, An armature 53 which is attracted by the magnetic core 51 and an armature spring 70 which applies an elastic force to the armature 53 in a direction away from the magnetic core 51.

The armature 53 may be configured to be rotatable around the pivot shaft 55. The rotating shaft 55 may be provided in a lower region of the armature 53. An amateur supporter 60 may be provided on one side of the armature 53 to support the armature 53 in a rotatable manner.

The pivot support portion 62 may be formed on the lower region of the amateur supporter 60 so that the armature 53 can be pivotally supported about the pivot shaft 55. The amateur supporter 60 may be provided with a screw 65 for adjusting the distance between the armature 53 and the magnetic core 51. The initial distance between the magnetic core 51 and the armature 53 can be determined by the screw 65.

An armature spring (70) for applying an elastic force to the armature (53) may be provided around the rotating shaft (55). The armature spring 70 may be a torsion coil spring.

A cross bar 71 may be provided on the upper side of the armature 53 so as to be pushed and rotated by the armature 53 when the armature 53 is sucked.

A trip shoe 71 is provided at one side of the cross bar 71 to perform a tripping function to intervene during rotation of the cross bar 71 when the armature 53 is sucked, A trip bar 73, a trip bar 75, and a latch holder 77, respectively.

The momentary operation characteristics of the armature 53 that is attracted by the magnetic core 51 during energization are the initial distance between the magnetic core 51 and the armature 53 and the initial distance between the armature 53 and the armature spring 70, (For example, the magnetic core 51 and the armature 53) detecting the spring constant of the armature spring 70, the initial and final loads of the armature spring 70, and the fault current, Therefore, it may become difficult to realize a constant instantaneous characteristic.

More specifically, the armature spring 70 is composed of a torsion coil spring. When the armature 53 is rotated by the attraction of the magnetic core 51, the armature spring 70 is compressed, There is a problem that the delay (interval) may be prolonged if the attraction force is gradually increased until the armature 53 is contacted.

Therefore, it is an object of the present invention to provide a trip unit of a circuit breaker which can smoothly perform an instantaneous trip operation even when the attraction force of the magnetic core is moderate.

Another object of the present invention is to provide a trip unit of a circuit breaker capable of realizing a certain instantaneous characteristic by the ultra-heavy load management of an armature spring.

It is still another object of the present invention to provide a trip unit of a circuit breaker capable of suppressing an increase in moment in an armature operating section.

In order to achieve the above-mentioned object, the present invention provides a magnetic core for generating magnetic force upon power application; An armature rotatably disposed on one side of the magnetic core; And an armature spring for applying an elastic force to the armature in a direction away from the magnetic core so as to suppress an increase in a moment acting on the armature when the armature is sucked by the magnetic core.

Here, the armature spring may be composed of a compression coil spring.

And an amateur supporter disposed on one side of the armature and rotatably supporting the armature.

The amateur supporter may include a support for supporting one end of the armature spring.

The armature may be configured such that the receiving portion is penetrated to receive the armature spring.

The supporting portion may be configured to be inserted into the receiving portion.

According to another aspect of the present invention, there is provided a magnetic core for generating magnetic force when a power is applied thereto. An armature rotatably disposed on one side of the magnetic core and sucked by the magnetic core; An armature supporter disposed on one side of the armature and rotatably supporting the armature; And an armature spring which is supported by the armature supporter at one end and contacts the armature so as to apply an elastic force to the armature so that an increase in a moment acting on the armature when the armature is sucked by the magnetic core is suppressed, A trip unit of a wiring breaker is provided.

Here, the armature may be formed with a receiving portion through which the armature spring can be received, and the armature supporter may include a support portion inserted into the receiving portion to support the armature spring.

According to another aspect of the present invention, A fixed contact fixedly disposed on the case; A movable contact which is disposed in contact with and detachable from the fixed contact; An opening / closing mechanism for opening / closing the movable contact; And a trip unit of the wiring breaker for tripping the opening / closing mechanism when a current equal to or greater than a predetermined level is supplied.

As described above, according to the embodiment of the present invention, the armature is provided with an armature spring that applies an elastic force in a direction away from the magnetic core so as to suppress an increase in moment acting on the armature when the armature is sucked, The instantaneous trip operation can be smoothly implemented even when the increase of the attracting force of the core is gentle.

In addition, since the rise of the moment hardly occurs within the operating range of the armature, it is possible to realize a constant instantaneous characteristic only by managing the superhigh load of the armature spring without considering the subordinate load of the armature spring.

1 is a sectional view of a conventional wiring breaker,
Fig. 2 is an enlarged view of the main part of Fig. 1,
3 is a view for explaining the operation of the trip unit of FIG. 2,
Fig. 4 is a perspective view showing the engagement state of the armature of Fig. 2,
5 is a cross-sectional view of a wiring breaker according to an embodiment of the present invention,
FIG. 6 is a perspective view of the armature region of FIG. 5,
FIG. 7 is a perspective view showing an image forming state of the armature of FIG. 6,
8 and 9 are views for explaining the suction operation of the armature,
FIG. 10 is a diagram showing attraction force of a magnetic core and operating load of an armature. FIG.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 5, the circuit breaker having the trip unit includes a case 110; A stationary contactor (120) fixedly disposed on the case (110); A movable contact (130) disposed in contact with and detachable from the fixed contact (120); An opening / closing mechanism 140 for opening / closing the movable contact 130; And a trip unit 150 of the circuit breaker according to an embodiment of the present invention that trips the opening / closing mechanism 140 when a current equal to or greater than a certain level is supplied.

The case 110 may be formed of an insulating resin material in a substantially rectangular parallelepiped shape. The stationary contactor 120 may be provided in the case 110. The stationary contactor 120 may include a stationary contact 122 spaced apart from the stationary contact 122 by a predetermined distance. A bus and a load may be connected to the fixed contact 120, respectively.

The movable contactor 130 may be disposed on one side of the stationary contactor 120 to be in contact with and separated from the stationary contactor 120. The movable contact 130 may be provided with a plurality of movable contacts 132 which are respectively in contact with and separated from the fixed contacts 122. A shaft 135 may be provided at the center of the movable contact 130. Accordingly, the movable contact 132 rotates about the shaft 135 and can be contacted and separated from the fixed contact 122 at the same time.

An opening and closing mechanism 140 may be provided on one side of the movable contactor 130 to provide a driving force to the movable contactor 130 so that the movable contactor 130 can be quickly turned to the closing and closing positions, respectively. Although not shown in detail, the opening / closing mechanism 140 may include a plurality of links, springs, motors, and the like. An operation handle 112 may be provided on one side of the opening / closing mechanism 140 so that the opening / closing mechanism 140 can be manually operated.

Meanwhile, the trip unit 150 may be provided on one side of the stationary contactor 120.

As shown in FIGS. 5 and 6, the trip unit 150 includes: a magnetic core 151 that generates a magnetic force when a power is applied; An armature 161 rotatably disposed on one side of the magnetic core 151; And the armature 161 applies an elastic force in a direction away from the magnetic core 151 so that an increase in a moment acting on the armature 161 when the armature 161 is sucked by the magnetic core 151 is suppressed. And an armature spring 181.

The magnetic core 151 may be electrically connected to one of the fixed contacts 120. The magnetic core 151 may include a suction portion 153 protruding toward the armature 161. A bimetal 155 may be provided between the suction portions 153. The body metal 155 may be deformed at a constant current to rotate the crossbar 191 to be described later.

An armature 161 may be provided on one side of the magnetic core 151 so as to be attracted by the magnetic core 151 to contact the suction unit 153 when a fault current is supplied.

The armature 161 may include a horizontal portion 163 and a vertical portion 164 bent at a substantially right angle to the horizontal portion 163 so as to have a substantially L shape. The rotary shaft hole 166 may be provided to allow the shaft 165 to be inserted through the horizontal portion 163.

The trip unit 150 may further include an armature supporter 171 that rotatably supports the armature 161 on one side of the armature 161. The amateur supporter 171 may be formed in an almost L shape. A rotation support portion 173 for rotatably supporting the armature 161 may be formed in the lower region of the armature supporter 171. The pivot support portion 173 may be formed with a pivot shaft insertion hole 175 through which the pivot shaft 165 can be inserted.

Meanwhile, the amateur supporter 171 and the armature 161 may be provided with the armature spring 181. The armature spring 181 may be a compression coil spring. Here, the armature spring 181 may be disposed such that one end thereof is supported by the armature supporter 171 and the other end thereof is capable of applying an elastic force to the armature 161.

According to this configuration, when a fault current is applied to the magnetic core 151 and the armature 161 is attracted by the magnetic core 151, the armature spring 181 is compressed to increase the elastic force, The operating point at which the elastic force of the armature spring 181 is applied is gradually moved to the working points closer to the rotating shaft 165 of the armature 161 so that the operating moment by the armature spring 181 hardly increases do. As a result, even if the suction force due to the supply of the fault current gradually increases, the armature 161 can be sucked (pivoted) smoothly if the suction force is larger than the initial load of the armature spring 181. Accordingly, the armature 161 is relatively short in the delay time (or the uncertainty period) until the attraction force of the magnetic core 151 becomes larger than the increase in the elastic force of the armature spring 181. Therefore, So that the instantaneous trip function can be performed quickly.

The armature 161 may be formed with a receiving portion 167 to receive the armature spring 181. The receiving portion 167 may be formed through the armature 161 so as to allow the armature spring 181 to move in and out. More specifically, the receiving portion 167 may be formed through the vertical portion 164.

The armature supporter 171 may be formed with a support 177 to support one end of the armature spring 181. The support portion 177 may protrude from the vertical section of the armature supporter 171 so as to be inserted into the accommodating portion 167.

More specifically, the upper end portion of the armature spring 181 is held in contact with the support portion 177, and the other end portion, more specifically, the lower end portion of the armature spring 181, As shown in Fig. Here, the armature spring 181 may be configured to have a constant initial load so as to perform an instantaneous trip function only when a fault current flows more than a certain level. At this time, the elastic force of the armature spring 181 acts on an action point P1 spaced a predetermined distance from the rotation axis 165 of the armature 161 as shown in FIG. When the armature 161 is rotated by the suction of the magnetic core 151, the points of action of the elastic force of the armature spring 181 are moved in the direction close to the rotation axis 165, The increase in the operating moment of the motor vehicle is hardly generated.

On the other hand, until the armature of the armature of the opening / closing mechanism 140 is released when the armature 161 is rotated by the magnetic core 151, a so-called " TRIGGER " A trip bar 191, a trip shooter 193, a trip bar 195, and a latch holder 197 for performing the above-described operation.

The trip shoe 193, the trip bar 195 and the latch holder 197 are continuously rotated when the armature 161 rotates to rotate the cross bar 191 to release the latching of the latch of the opening / closing mechanism 140 . When the lock of the latch is released, the shaft 135 is rotated by the biasing force of the trip spring of the opening / closing mechanism 140, so that the movable contactor 130 is quickly rotated away from the fixed contactor 120.

With this configuration, when a fault current (large current) is supplied to the magnetic core 151, the magnetic core 151 is magnetized and a magnetic force is generated. If the attraction force generated by the fault current is larger than the initial load of the armature spring 181, the armature 161 is attracted toward the magnetic core 151 and rotated. 9, when the armature 161 is rotated, the armature spring 181 is further compressed to increase the elastic force. However, as shown in FIG. 9, the elastic force of the armature spring 181 is transmitted to the armature 161 The action points move in the direction close to the coaxial shaft 165 and the distance from the pivot shaft 165 is shorter than the distance between the initial action points P1 shown in Fig. It shall not increase. Thereby, a rapid instantaneous trip operation can be performed without generating a large delay. In addition, since only the superhigh load of the armature spring 181 is managed without considering the longitudinal load of the armature spring 181, it is easier to obtain a constant instantaneous characteristic.

10, the magnitude of the attractive force of the magnetic core 151 due to the fault current conduction is proportional to the square of the distance between the magnetic core 151 and the armature 161, As shown in FIG.

Since the elastic force of the armature spring 181 increases when the armature 161 is rotated by suction of the magnetic core 151 in the conventional wiring breaker, the operating load of the armature spring 181 has the same slope as the line L2 Can be shown as changing.

In the trip unit 150 of the present invention, even when the armature 161 sucks and rotates, an increase in the operation moment hardly occurs. Therefore, there is almost no change in the operating load of the armature 161 as indicated by a line L3 .

In the conventional circuit breaker, the delay is relatively long until the armature 161 sucks (rotates) due to the increase of the elastic force of the armature spring 181 and performs the trip function. In the circuit breaker according to the present invention, It can be seen that the increase in the operating moment of the armature spring 181 is not so much and the delay (section) to the time when the attracting force of the magnetic core 151 exceeds the initial load of the armature spring 181 is relatively small.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention may be embodied in various forms without departing from the spirit or essential characteristics thereof, so that the above-described embodiments should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: Case 112: Operation handle
120: fixed contactor 122: fixed contact
130: movable contactor 132: movable contact
140: opening / closing mechanism 150: trip unit
151: magnetic core 161: amateur
163: horizontal part 164: vertical part
165: Pivot shaft 167:
171: Amateur supporter 177: Support
181: Amateur Spring 191: Crossbar
193: Trip Shooter 195: Trip Bar
197: Latch Holder

Claims

A magnetic core for generating magnetic force upon power application;
An armature rotatably disposed on one side of the magnetic core, the armature having a horizontal portion having a rotating shaft at one end and a vertical portion bent at the other end of the horizontal portion;
A pivotal support portion coupled to the pivotal shaft and rotatably supporting the armature, a horizontal portion disposed at a lower side of the horizontal portion of the armature, the pivotal support portion being provided at one end thereof and bent at the other end portion of the horizontal section, An amateur supporter having a vertical section disposed outside the vertical portion of the armature; And
One end of the armature is supported by the armature supporter and the other end thereof is supported by the armature so that the armature is moved away from the magnetic core so as to suppress an increase in moment acting on the armature when the armature is sucked by the magnetic core And an armature spring for applying an elastic force,
The armature spring is constituted by a compression coil spring,
Wherein the vertical portion is formed with a receiving portion penetrated to receive the armature spring,
A support portion protruding to be accommodated in the accommodating portion is formed in a vertical section of the amateur supporter,
Wherein an upper end portion of the armature spring is supported by the support portion and a lower end portion of the armature spring is supported by a bottom portion of the accommodating portion.

The method according to claim 1,
Wherein an upper end portion and a lower end portion of the armature spring are disposed inside the accommodating portion before the armature is sucked by the magnetic core, and a lower end portion of the armature spring is disposed inside the accommodating portion so as to approach the pivot shaft The trip unit of the circuit breaker for a wiring breaker.

3. The method of claim 2,
And the upper end of the armature spring is drawn out from the receiving portion and disposed outside the receiving portion when the armature is sucked by the magnetic core.

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