KR101780888B1

KR101780888B1 - Circuit breaker

Info

Publication number: KR101780888B1
Application number: KR1020157034995A
Authority: KR
Inventors: 신이치 치구사; 노부오 미요시
Original assignee: 미쓰비시덴키 가부시키가이샤
Priority date: 2013-07-12
Filing date: 2013-07-12
Publication date: 2017-09-21
Also published as: JP5422086B1; CN105378888B; KR20160006760A; CN105378888A; JPWO2015004805A1; WO2015004805A1

Abstract

[PROBLEMS] To provide a circuit breaker which does not have any additional parts, is adapted for automatic assembly, and is made compact and stable in operation.
[MEANS FOR SOLVING PROBLEMS] A circuit breaker according to the present invention comprises a pressure plate for operating a movable contact conductor to bond a movable contact to a stationary contactor, A link that operates to push up the pressure plate by a pressing force of the grise spring by releasing the trip bar, and a torsion spring having an elongated member and a stepped member, And an engaging protrusion provided directly below the spring latch shaft and engaged with the long and short ends of the OFF trip spring so as to intersect with each other, And the length of the link member is not in engagement with the link pin. And a gong.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a wiring breaker or an earth leakage breaker, and more particularly to a tripping mechanism of the circuit breaker.

In a circuit breaker having a known fast-in mechanism for rapidly connecting the contacts between the contacts regardless of the operating speed of the manual handle, the tripping force of the lever is secured by the main spring, It is possible to secure a tripping force, that is, an attached switching force, irrespective of the state. However, in the circuit breaker having a mechanism of slow-in, there is no main spring, The tripping force can not be ensured in the OFF state and the tripping operation is impossible because the pressure plate is caught by the stopper when the circuit breaker is in the OFF state.

However, in recent years, for example, when the operation of an alarm contact is confirmed, there is an increasing need to perform a trip operation even in the OFF state. The circuit breaker can be tripped even in the OFF state. For example, a torsion spring for pressing the contact piece of the latch plate to the free end side of the bimetal is provided, and the handle is OFF , The latch plate is pressed with a strong force and when the latch plate is in the ON state, the latch plate is pressed with a weak force (Patent Document 1, page 3, right column, line 7 to page 4, right side See column 2 of Haran).

However, although the circuit breaker of the conventional device can perform a single trip operation even in the OFF state, it has been found that the following problems arise when the circuit breaker is used for the trip operation in the OFF state in accordance with the configuration. That is, the torsion spring that applies a moment to the contact plate of the latch plate continues to apply the moment to the contact plate even in the ON state. Therefore, there is a problem that the tripping load of the contact plate increases, and when the tripping load increases, The miniaturization of the tripping device for tripping the contact plate is hampered, and there is no tolerance for the tripping force of the tripping device, and the tripping operation becomes unstable.

In general, in order to apply automatic assembly, a simple assembly is required. However, since the frame of the mechanism is constituted by a combination of two metal plates subjected to a bending process and each component is held in the frame, The torsion spring is usually formed inside the metal plate. If the legs of the spring are hooked after the frame is engaged, it is difficult to perform the operation because it is in the corner portion, and in some cases, The equipment becomes expensive. In addition, if the spring is outside the frame, it is possible to simplify the spring engagement, but it is necessary to prevent the spring from coming off.

Patent Document 1: JP-A-58-131625

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a circuit breaker which performs a trip operation in the above-described OFF state without requiring additional components, And to contribute to the miniaturization of the circuit breaker and the stabilization of the operation.

A circuit breaker of the present invention is a circuit breaker comprising: a frame fixed to a housing; a manual handle rotatably pivotally mounted on the frame; a fixed contact conductor provided with a fixed contact; and a movable contact A movable contact conductor, a gripe spring for pressing the movable contact conductor in a direction to open the movable contact conductor from the fixed contact conductor, and an ON / OFF operation of the fixed contact and the movable contactor by the turning operation of the manual handle And an opening / closing mechanism for detecting an overcurrent or a short-circuit current to perform a trip operation, the circuit breaker comprising: a pressure plate (a pressing plate) which moves up and down with respect to the housing while maintaining engagement with the movable contact conductor; A roller engaging with an upper portion of the platen; and a roller rotatably supporting the roller in a handle hole of the manual handle by a link pin A torsion spring having a long leg and a short leg and being held by a spring latch shaft corresponding to a rotational axis of the manual handle; a torsion spring provided on a frame in the vicinity of the spring latch shaft, And an engaging protrusion which is engaged in a state in which the long and short legs cross each other,

Wherein the torsion spring has a length that does not engage with the link pin and that a long length of the torsion spring is engaged with the engaging projection part during the turning operation of the manual handle, .

According to the present invention, the tripping load can be reduced without additional parts, the tripping portion can be further downsized, and both the cost reduction and the downsizing of the circuit breaker can be achieved.

1 is a side sectional view showing an ON-state circuit breaker according to the first embodiment of the present invention.
Fig. 2 is an enlarged exploded perspective view showing the components of the opening / closing mechanism of the circuit breaker of Fig.
3 is an enlarged side view showing the relay unit in the first embodiment.
4 is a side cross-sectional view showing the circuit breaker in OFF state in the first embodiment.
5 is a side sectional view showing a circuit breaker in a trip state in the first embodiment.
Fig. 6 is a perspective view showing a state in which an OFF trip spring is assembled on a frame-like plate in the first embodiment. Fig.
7 is a view showing a state in which a trip button switch is provided in the first embodiment;

Embodiment 1

1 to 8 show a circuit breaker according to a first embodiment of the present invention. In Figs. 1 and 2, a circuit breaker 100 includes a housing 1 made of an insulating material, A fixed contact conductor 2 provided with a fixed contact 4 and a movable contact 6 provided with movable contacts 6 which are brought into contact with and separated from the fixed contact 4, A contact conductor 5, an opening / closing mechanism for turning ON / OFF the fixed contacts 4 and the movable contacts 6, and the like.

The opening and closing mechanism portion includes a pressing plate 7 made of an insulating material that moves in the vertical direction on the paper surface along a groove (not shown) of the housing 1 while maintaining engagement with the movable contact conductor 5, A roller 11 engaged with the pressure plate 7 from above and a link 11 pivotally mounted by a link pin 9 to a handle hole 10a of the manual handle 10, (13) and an opening spring (21) for pressing the movable contact conductor (5) in the opening direction with respect to the fixed contact conductor (2). The link 13 is rotatably fixed by a pin (not shown), and is adapted to push down the pressure plate 7 via the roller 11 by operating the manual handle 10. When the circuit breaker 100 is in the OFF state, the movable contact conductor 5 is brought into contact with the fixed contact conductor 2, And is released from the fixed contact conductor 2 by the urging force of the gary spring 21. [

2, the frame 12 has an angular cylinder shape in which a U-shaped plate 12a and a flat plate 12b are joined by swaging, and the housing 12 As shown in Fig. Shaped plate 12b of the frame 12 and is provided with a lever 16 which is pivotably pivotally mounted on the pivot 15 and the concave portion 18 of the chord plate 12a Is engaged with the trip bar (8) on the left side of the ground at one end away from the rotating shaft, and the opposite right side is engaged with the roller (11). The roller 11 is pressed in the direction of the lever 16 by the pressing plate inclined portion 7a provided on the upper portion of the pressing plate 7 and is moved upward and downward along the right side face of the lever 16 by the operation of the handle 10. [ .

The lower end surface of the frame 12 is disposed on the movement locus of the pressure plate 7 and the position of the upper end of the frame 12 as a stopper of the pressure plate 7 . The flat plate 12b of the frame 12 is provided with a hole for receiving the handle pivot shaft 10b formed at a position corresponding to the handle pivot shaft 10b and an OFF trip spring A spring engagement shaft 12c is formed by burring to fix and fix the first and second engaging portions 14a and 14a. An engagement projecting portion 12d formed by bending a portion of the frame 12 in the shape of an L is formed in the vicinity of the spring engagement shaft 12c And the unitary member 14b are crossed (see Fig. 6). The long member 14a is a length long enough to engage with the link pin 9 inserted into the handle hole 10a of the manual handle 10 and the member 14b is a length not engaged with the link pin 9. The trip bar 8 has a T-shape in which a central portion is pivotally supported on the frame 12 by a pin, and is pressed counterclockwise in the drawing by another torsion spring (not shown).

3, the relay unit 17 includes a coil 17a through which an overcurrent or a short-circuit current flows, an iron core 17b pressed by the coil 17a, and an armature 17b which is attracted to the iron core 17b. the lever 16 and the trip bar 8 are engaged with each other by engaging with the armature 17c and the hydraulic pressure receiving portion 8a of the trip bar 8 in conjunction with the armature 17c And the pressing portion 17d.

Next, the operation will be described.

First, the operation from OFF to ON of the circuit breaker 100 will be described with reference to Figs. 1 and 4. Fig. 4, when the manual handle 10 is pushed in the direction of the arrow A, the manual handle 10 rotates around the handle shaft 10b, and the link pin 9 is inserted into the handle hole 10a The link 13 connected to the link 13 is moved in the direction of the arrow B and the roller 11 connected to the link 13 abuts against the lever 16 and moves downward along the side surface of the lever 16 Push the platen (7) down. Since the extended length 14a of the OFF trip spring 14 engaged with the link pin 9 is caught by the engaging projection 12d of the frame at any timing during the operation of the manual handle 10, 9 and the manual handle 10 are not subjected to the force from the OFF trip spring 14. [ The long arm 14a of the OFF trip spring 14 is engaged with the link pin 9 but it is also possible to provide a projection on the manual handle 10 instead of the link pin 9, Do.

When the pressure plate 7 moves downward, the movable contact conductor 5 engaged with the pressure plate 7 is moved in the direction in contact with the stationary contact conductor 2 while receiving the reaction force from the grise spring 21 Move. Thus, the movable contactor 6 comes into contact with the stationary contactor 4, and the movable contact conductor 5 becomes the ON state shown in Fig. 1, and the operation from OFF to ON is completed. The link pin 9 is located on the left side of the ground on the ground of a little more than the line connecting the handle shaft 10b and the roller 11 and the link pin 9 is connected to the roller 11 via the link 13 in the upward direction The manual handle 10 is stopped at the ON position.

Next, an operation from ON to OFF will be described with reference to Figs. 1 and 4. Fig. 1, when the manual handle 10 is pushed in the direction of the arrow C, the handle shaft 10b, the link pin 9, and the roller 11 are aligned in a straight line. In this stroke, the movable contact conductor 5 is slightly pushed down. When the link pin 9 moves from the straight line to the right side in Fig. 1, the pressure plate 7 which receives the reaction force from the grise spring 21 pushes the roller 11 and the link 13 upward , And starts to act to further turn the manual handle 10 in the C direction.

At this time, during the rotation, the link pin (9) is caught by the spring tongue (14a) and a load is applied in a direction to prevent the rotation of the link pin (9). However, since the turning moment of the link pin 9 is larger than the spring moment of the OFF trip spring 14, the manual handle 10 is rotated in the C direction without any problem. The link pin 9 connected to the handle hole 10a also moves to the right (D direction) in Fig. 1 and the roller 11 coupled to the link 13 moves upward on the plane of Fig. As a result, the pressure plate 7 and the movable contact conductor 5 also return to the OFF position by an operation completely opposite to the operation from OFF to ON, and the movable contactor 6 and the fixed contactor 4 are opened, As shown in Fig.

Next, a trip operation when an overcurrent flows in the circuit breaker 100 will be described with reference to Figs. 1, 3, and 5. Fig.

3, when an overcurrent flows in the coil 17a, a magnetic force is generated in the iron core 17b, and the iron core 17b is attracted in the direction of arrow E. Then, the attracting force for attracting the armature 17c increases, and the armature 17c rotates counterclockwise, so that the pressing portion 17d shuts the trip bar 8 in the direction of the arrow F. As a result, as shown in Fig. 1, the trip bar 8 rotates clockwise in the direction of arrow G so that the engaging portion 8b of the trip bar 8 and the engaging portion 16a of the lever 16 are engaged with each other Is released. As a result, the lever 16 is rotated in the direction of arrow H, the pressure plate 7 and the movable contact conductor 5 are pushed up by the gripe spring 21, and the movable contactor 6 is brought into contact with the stationary contactor 4, And is in the tripped state shown in Fig.

Next, a case in which the trip operation is performed by the trip button switch in the OFF state, for example, when the operation of the alarm contact is confirmed, will be described with reference to Fig.

As shown in Fig. 7, the trip button switch 20 is disposed on the upper portion of the armature 17c and fixed to the housing 1 so as to be movable up and down. When the trip operation is confirmed, the trip button 20 is pressed in the downward direction as shown by the arrow to come into contact with the upper surface portion of the armature 17c. As a result, the armature 17c is rotated in the counterclockwise direction on the ground, and the pressing portion 17d rotates the pressure receiving portion 8a of the trip bar 8, as in the trip operation when the overcurrent flows, The engagement between the engaging portion 8b of the trip bar 8 and the engaging portion 16a of the lever 16 is released to complete the trip operation.

In order to electrically output the tripped state of the circuit breaker 100, an accessory device containing a microswitch is used in the circuit breaker. However, in order to switch the microswitch, (Direction of arrow K in Fig. 4). The moment of the OFF trip spring 14 is set so that the turning force of the lever 16 becomes the micro switch switching force and the moment of the OFF trip spring 14 is set so that the pressure plate 7 pushes up the grip spring 21 hooked to the lower end of the frame 12 It is possible to obtain a tripping action, that is, a switching force of the built-in microswitch incorporated, even in the OFF state where the force is not available.

Next, the operation when returning from the trip state to the OFF state will be described with reference to Figs. 4 and 5. Fig. 5, when the manual handle 10 is rotated in the L direction, the link 13 and the roller 11 also follow the M direction, and the roller 11 is pulled out from the gap between the lever 16 and the pressure plate 7 Loses. After the roller 11 is pulled out, the lever turning projection 10c of the manual handle 10 contacts the handle engaging surface 16c of the lever 16 to rotate the lever 16 in the N direction. As a result, the lever 16 holding the trip bar 8 disappeared and the trip bar 8 is rotated in the counterclockwise direction by a torsion spring not shown in the drawing, and the lever 16 And the one end 16a of the lever 16 are engaged with each other and returned to the OFF state shown in Fig.

Fig. 6 is a perspective view showing a state in which the OFF trip spring 14 is assembled to the frame-shaped plate 12b. The OFF portion of the OFF trip spring 14 is inserted into the spring latching shaft 12c formed by burring the flat plate 12b of the frame 12 and the coiled portion 14a of the OFF trip spring 14, (14b) is caught by the engaging projection (12d) of the frame-like plate (12b) in a state in which the torsional moment is exerted. As shown in Fig. 6, the engaging projection 12d of the frame plate 12b has a concave shape corresponding to the engagement position of the long leg 14a and the short leg 14b of the OFF trip spring 14, And the coil part is prevented from slipping out.

According to the present embodiment, since the OFF trip spring 14 is hooked on the engaging projection 12d provided on the frame 12 in the ON state and the link pin 9 is not pressed, 16 can be made zero, and the tripping load of the lever 16 can be greatly reduced. Further, according to this, since the configuration of the tripping device can be simplified, the circuit breaker can be downsized.

In addition, since the engaging projection 12d provided on the frame 12 has a concave shape corresponding to the engagement position of the long arm 14a and the arm member 14b of the OFF trip spring 14, Since the OFF trip spring 14 can be supplied at the time of frame supply, the assembling property is improved, and it is not necessary to hang the spring after the mechanical part is assembled, The investment cost can be reduced.

In the above embodiment, the example in which the OFF trip spring 14 is held and fixed on the spring latching shaft 12c obtained by burring the flat plate 12b of the frame 12 has been described. However, 12c may be replaced by the handle shaft 10b.

1: Housing 2: Fixed contact conductor
4: fixed contactor 5: movable contact conductor
6: movable contactor 7: pressure plate
7a: Platen slope 8: Trip bar
8a: Pressure receiving portion of the trip bar 8b: Engaging portion of the trip bar with the lever
9: Link pin 10: Manual handle
10a: handle hole 10b: handle shaft
10c: lever turning projection 11: roller
12: Frame 12a: Frame < RTI ID = 0.0 >
12b: frame plate shape plate 12c: spring catch axis
12d: engaging projection 13: link
14: OFF trip spring 14a:
14b: Tandem 16: Lever
16a: A pair of levers engaging the trip bar
16c: Handle engaging surface of the lever 17:
17a: coil 17b: iron core
17c: Amateur 17d:
20: Trip button switch 21: Gary spring
100: Circuit breaker

Claims

A movable contact conductor provided with a frame fixed to the housing, a manual handle rotatably pivotally mounted on the frame, a fixed contact conductor provided with a fixed contact, and a movable contact which is brought into and out of contact with the fixed contact, A movable contact and a fixed contact conductor; a resilient spring for urging the contact conductor in a direction to open and separate the contact conductor from the fixed contact conductor; and an on / off operation of the stationary contactor and the movable contactor by a turning operation of the manual handle, (Push plate) which moves up and down with respect to the housing while maintaining engagement with the movable contact conductor, and a switch mechanism for switching the upper portion of the pressure plate A link for pivotally mounting the roller to the handle hole of the manual handle so as to be rotatable by the link pin, A torsion spring having a long leg and a short leg and being held by a spring latch shaft corresponding to a rotational axis of the manual handle; and a torsion spring provided on a frame near the spring latch shaft, And an engaging protrusion which is engaged in a crossed state,
The torsion spring has a length that does not engage with the link pin and that the torsion spring is hooked on the engaging projection part during the turning operation of the manual handle Circuit breaker.

The method according to claim 1,
And a trip bar which is rotatably mounted on the frame and contacts the roller when the manual handle is ON or OFF and at least a trip bar that is temporarily hooked to the lever when the circuit breaker is in the OFF state, And a tripping operation is performed by rotating the lever by the moment of the torsion spring by releasing the engagement of the trip bar.

The method according to claim 1,
Wherein an engagement of the torsion spring with the link pin is engaged with the engagement protrusion during the ON operation of the manual handle.

The method according to claim 1,
Wherein the link pin is hooked by the torsion spring in the middle of the OFF operation of the manual handle.

The method according to claim 1,
Wherein the torsion spring is fixed to a burring protruding from the frame.

The method of claim 5,
Wherein a shaft of the manual handle is inserted and passed through an inner hole of the burring projected from the frame to prevent the torsion spring from coming off.

The method according to claim 1 or 2,
Wherein a length of the torsion spring is inserted into the manual handle or the manual handle so as to be engaged with the link pin.

The method according to claim 1 or 2,
Wherein the torsion spring is held and fixed to the handle shaft.