JP2537486B2 - Remote control type circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a remote control circuit breaker.

[Background technology]

There has been proposed a remote control type circuit breaker capable of turning on and off the movable contactor by a handle and also turning on and off by a remote signal, which has an off priority function. That is, the fifth
Electromagnet operated by remote signal as shown in FIGS.
A fixed contact 71 is controlled by 70, and a movable contact 76 is controlled by an opening / closing / trip mechanism 75 having a handle 73 and a current detecting means 74 such as a bimetal. When the fixed contact 71 is in the on position, the movable contact 76 can be turned on and off by operating the handle 73, but when the fixed contact 71 is in the off position apart from the movable contact 76, the movable contact is in the off position. Child
Fixed contact 77 and movable contact of fixed contact 71 even when 76 is turned on
There is no contact with 78. Conversely, when the handle 73 is turned on to move the movable contact 76 to the on position, the remote contact causes the fixed contact 77 of the fixed contact 71 to contact the movable contact 78 of the movable contact 76 and the state where the fixed contact 77 is separated from the movable contact 76. However, when the handle 73 is turned off to move the movable contact 76 to the off position, the movable contact 78 of the movable contact 76 contacts the fixed contact 77 of the fixed contact 71 no matter how the electromagnet 70 is driven. Never.

By the way, in such a remote control type circuit breaker, when a short-circuit current flows in the electric path, the opening / closing / tripping mechanism 75 trips and the movable contactor 76 opens as shown in FIGS. At that time, the movable contact 78
When an arc is generated between the fixed contact 77 and the fixed contact 77, an arc current flows through the path shown by the alternate long and short dash line in FIG. 6, and as a result, the fixed contact 71 heats up.

However, since the fixed contact 71 is held by the support 79 made of synthetic resin, the support 79 is heated by the heat generated by the fixed contact 71.
However, there was a problem in that some of them melted, and a large amount of gas was generated from the support 79, resulting in a reduction in short-circuit breaking performance.

[Object of the Invention]

An object of the present invention is to provide a remote control type circuit breaker capable of reducing the melting of the fixed contact support and the generation of gas.

[Disclosure of Invention]

The present invention relates to a power supply terminal, a fixed contactor which is connected to the power supply terminal and which is supported by a synthetic resin support and has a fixed contact, and a fixed position in which the fixed contact is in an on position and in an off state in a retracted position. An electromagnet for movably controlling the support, a movable contact having a movable contact for contacting with and separating from the fixed contact at the forward position, and an operation of a handle to turn on / off the movable contact and detect a current. An opening / closing / tripping mechanism having a configuration in which a trip operation is performed by a portion, and one end portion is connected to the power supply terminal so that an intermediate portion approaches the fixed contact in the ON state and the other end portion moves from the intermediate portion to the movable contact. An arc traveling plate extending in the vicinity of the contact opening position of the movable contact along the opening and closing direction of the child, the other end of the arc traveling plate and the contact opening position of the movable contact. It is obtained by a arc-extinguishing grid disposed between.

According to the invention, by operating the handle or the electromagnet,
The movable contact and the fixed contact can be controlled to be turned on and off, and one end of the arc traveling plate is connected to the power supply terminal, and the middle part of the arc traveling plate is brought closer to the fixed contact in the on state, and the other end of the arc traveling plate is in movable contact. Since an arc extinguishing grid is placed between the contact opening position of the child, current flows through the fixed contact in the ON state, but when an arc occurs during a trip, the arc travels from the fixed contact to the arc traveling plate. Then, the arc current flows from the arc traveling plate to the power supply terminal, and the arc current stops flowing to the fixed contact because it is attracted to the arc extinguishing grid. As a result, the heat generation of the fixed contact can be suppressed low, the melting of the support and the generation of gas can be reduced, and the current interruption capability can be secured. Further, by controlling the fixed contactor with the electromagnet, it is possible to give priority to OFF, and the support made of synthetic resin that supports the fixed contact can facilitate the connection with the electromagnet.

Embodiment An embodiment of the present invention will be described with reference to FIGS. That is, this remote control type circuit breaker includes a power supply terminal 13, a fixed contactor 7 connected to the power supply terminal 13 and having a fixed contact 6 supported by a synthetic resin support 21, and a fixed contact 6. Support is movable between an on-state forward position and an off-state retracted position
An electromagnet 9 for controlling 21, a movable contactor 2 having a movable contact 5 that comes in contact with and separates from a fixed contact 6 at a forward position, and an operation of the handle 1 turns the movable contactor 2 on and off and causes the current detector 3 to trip. The opening / closing / tripping mechanism 4 having the structure and one end of the movable contact 2 are connected to the power supply terminal 13 so that the intermediate part approaches the fixed contact 7 in the ON state and the other end extends from the intermediate part in the opening / closing direction of the movable contact 2. The arc traveling plate 11 extending near the contact opening position of the movable contact 2,
An arc extinguishing grid 10 provided between the other end of the arc traveling plate 11 and the contact opening position of the movable contact 2 is provided.

Explaining in detail below, the entire circuit breaker is composed of a case K that forms an outer shell and a cover that closes the side opening. The cover is on the front side in FIG. 1 and is not shown. First, the electromagnet 9 is a reciprocating electromagnet.
Is a plunger having contacts 15a and 15b at both ends that reciprocate, 16 is a coil frame that slidably supports the plunger, 17
Is a coil, 18 is a first yoke arranged outside the coil frame 16, 19 is a second yoke having an opposing piece on the contactor 15b side, and 20 is a combination of the first yoke 18 and the second yoke 19. It is a permanent magnet that is interposed between and forms mutually different magnetic poles. When the armature 15a of the plunger 15 is attracted to the first yoke 18 and the armature 15b is attracted to the second yoke 19 as shown in FIG. 1, it is in the non-excitation stable state and the coil 17 is energized. As a result, the plunger 15 operates so that the armature 15b comes into contact with the first yoke 18 as shown in FIG.

The fixed contactor 7 has an inverted J-shape, covers the synthetic resin support 21, and is slidably held in the groove 22 of the support 21. The support 21 is a fixed shaft 23 supported by the case K.
Is supported on the back side of the fixed contact 6 of the fixed contact 7 by a recess 24.
With a buffer spring 25 interposed in the recess 24, the fixed contact 8 is biased in the direction in which the fixed contact 7 advances. Further, a notch 26 for engagement is provided on the opposite side of the recess 24 to the fixed shaft 23 of the support 21.
The engaging notch 26 has a connecting portion of the plunger 15.
It engages with a shaft 28 provided on 27. Therefore, when the plunger 15 is in the stable state shown in FIG. 1, the fixed contact 7 is in the posture shown in the figure, but when the plunger 15 operates as shown in FIG. 3, the notch 26 is pushed by the shaft 28 to support the support 21. Rotates about the fixed shaft 23, and the fixed contact 7 moves to the position shown in FIG. That is, at this time, the fixed contact 6 is separated from the movable contact 5 in the ON state.

The arc-extinguishing grid 10 is located at the bottom of the case K on the opening side of the movable contact 2, and the exhaust hole 29 is formed on the back side thereof.
Further, the power supply terminal 13 is exposed on the side opposite to the arc extinguishing grid 10 of the case K, and the terminal plate 30 is the arc traveling plate of the arc extinguishing grid 10.
The arc traveling plate 11 is formed integrally with the fixed contactor 7, and is arranged on the one end 7a side of the fixed contact 7 so as to be separated and face each other. Further, the arc traveling plate 11 and the other end portion 7b side of the fixed contact 7 are connected to each other by a flexible electric wire 12 which is a net braid.

In the opening / closing / trip mechanism 4, the handle 1 is pivotally supported by a fixed shaft 32 near the top of the case K, and a part of the handle 1 is exposed through the hole 31 of the case K. Further, a movable contact engaging recess 33 and a reset leg 34 are formed at the inner end of the handle 1. Reference numeral 35 is a trip link having a substantially inverted L shape, one end of which is pivotally supported by a fixed shaft 36 on the case K, one end of a reversing spring 37 is locked at an intermediate portion, and a reset projection 38 is formed in the vicinity thereof. A locking claw 39 is formed at the other end. The middle portion of the movable contactor 2 is locked to the other end of the reversing spring 37 and pulled upward in FIG. 1 by the pulling action, and the upper end portion of the movable contactor 2 has the movable contactor of the handle 1. A movable contact 5 that engages with the combination recess 33 and that faces the fixed contact 6 is provided at the lower end. Reference numeral 40 denotes a latch link, the upper end of which is pivotally supported by the fixed shaft 41 of the case 15 and the lower end of which is bent into an L shape to form the detection unit 42, and the latch unit 43 near the lower end of the latch link 40. Are formed by holes or notches. In the regulated state of the trip link 35 in which the locking claw 39 is locked to the latch portion 43, the handle 1 is first
The position shown in the figure is the ON state, and the state shown in FIG. 2 is the OFF state. That is, when the upper end of the reversing spring 37 crosses the movable contactor 2, the movable contactor 2 is reversed due to the pulling action of the reversing spring 37, and the above operation is achieved. Reference numeral 44 denotes a stopper for the movable contact 2 in the open state.

The current detector 3 is made of bimetal, and its upper end is fixed to the upper end of the vertical portion of the terminal plate 45 of the load terminal 14, and the lower end faces the inside of the detector 42 of the latch link 40. The position adjustment of the lower end of the current detector 3 and the detector 42 is performed by an adjusting screw 46 provided on the terminal plate 45. The current detector 3 and the movable contactor 2 are connected by a flexible electric wire 47. Here, the current of this circuit breaker will be explained. When viewed in one direction, the load terminal 14 → terminal plate 45 → current detecting portion 3 → electric wire 47 → movable contactor 2 → movable contact 5 → fixed contact 6
→ Fixed contact 7 → Flexible wire 12 → Terminal board 30 → Power terminal 13
Becomes

Reference numeral 48 is an indicator lamp using a light emitting diode as an example to show the operating state of the electromagnet 9, 49 is its window, and 50 is an adjusting screw window.

The operation will be described. FIG. 1 shows the ON state.
That is, since the fixed contact 6 and the movable contact 5 are in contact with each other, a current flows through the electric path in the path. 2 is an off state by the handle 1, and when the handle 1 is tilted from the state of FIG. 1 to the state of FIG. 2, when the movable contact 2 crosses the upper end of the reversing spring 37, the pulling action of the reversing spring 37 is performed. As a result, the movable contact 2 is reversed and the movable contact 5 is separated from the fixed contact 6. The movable contact 2 is locked to the stopper 44. In this OFF state, the fixed contact 6 does not come into contact with the movable contact 5 even if a remote signal is applied to the coil 17 of the electromagnet 9.

FIG. 3 shows the off state by the electromagnet 9, and when a remote signal is applied to the electromagnet 9 in the state of FIG.
It descends from the figure to FIG. As a result, the fixed contact 7
Is separated from the movable contactor 2 in the ON state shown in FIG. 1, and the fixed contact 6 is separated from the movable contact 5. Also at this time, the movable contact 5 does not come into contact with the fixed contact 6 even if the handle 1 is operated contrary to the case where the handle 1 is turned off. In other words, the off-priority function is realized from these operations. The movable contact 2 is supported by the stopper 51 at this time.

FIG. 4 shows a trip state. That is, when an overcurrent flows in the electric path, the current detector 3 bends in the state shown in the figure,
Therefore, the latch link 40 rotates counterclockwise and the latch part 43 separates from the locking claw 39. When the locking claw 39 of the trip link 35 is released, the trip link 35 is released from the regulation state, and when the trip link 35 is rotated clockwise around the fixed shaft 36 by the pulling action of the reversing spring 37, the trip link 35 is rotated. At the same time, the movable contactor 2 is rotated counterclockwise, the movable contact 5 is separated from the fixed contact 6, and the handle 1 is in the neutral position as shown in the figure. Will be done.

Further, when a short-circuit current flows in the electric path, the electromagnetic repulsive force of the movable contact 2 and the fixed contact 7 causes the fixed contact 7 to instantaneously rotate against the attractive force of the plunger 15 to cause contact separation. The opening / closing / trip mechanism 4 trips as described above so as to catch up.

In these trip operations, when the handle 1 in the neutral state is tilted to the off side in the reset operation, the reset projection 34 is pushed by the reset leg 34, and the locking claw 39 of the trip link 35 is latched by the latch link 40 in the reset state. The locked state can be achieved by locking the portion 43.

When an arc occurs between the movable contact 5 and the fixed contact 6 during a trip, the arc end on the movable contact 2 side moves to the arc extinguishing grid 10 due to the opening operation of the movable contact 2.
The arc end on the fixed contact 7 side moves from the fixed contact 6 to the arc traveling plate 11 from one end 7a of the fixed contact 7 and travels to the arc extinguishing grid 10, whereby the arc is extinguished by the arc extinguishing grid 10. It As described above, when the arc current at the time of arc generation is transferred to the arc traveling plate 11, the fixed contact 7 and the flexible electric wire 12 stop flowing, so that the fixed contact 7 generates less heat and therefore the movable frame 21 is overheated. Since it does not occur, a part of it is not melted or a large amount of gas is not generated.

In this embodiment, the electromagnet 9 is of a reciprocating type, but may be of a rotating type. Further, the fixed contact 7 is rotatably supported by the fixed shaft 23 via the support 21, but may be provided integrally with the plunger 15. Further, the opening / closing / trip mechanism 4 is a quick-insertion type using the reversing spring 37, but may be a late-insertion type, as long as the circuit breaker can be opened / closed by the handle 1 and the tripping operation is performed by the current detecting means 3. Good. The current detecting means 3 is not limited to the bimetal, but may be an electromagnetic type or the like.

〔The invention's effect〕

According to the present invention, the turning of the movable contact and the fixed contact can be controlled by operating the handle or the electromagnet, and one end of the arc traveling plate is connected to the power supply terminal, and the intermediate part thereof is used as the fixed contact in the ON state. Since the arc extinguishing grid is placed between the other end of the arc traveling plate and the contact opening position of the movable contact, the current flows through the fixed contact in the ON state, but the arc is generated during trip. When the arc is generated, the arc moves from the fixed contact to the arc traveling plate and is attracted to the arc extinguishing grid, so that the arc current flows from the arc traveling plate to the power supply terminal and the arc current does not flow to the fixed contact. As a result, the heat generation of the fixed contact can be suppressed low, the melting of the support and the generation of gas can be reduced, and the current interruption capability can be secured. Further, by controlling the fixed contactor with the electromagnet, it is possible to give priority to OFF, and it is possible to easily connect the fixed contactor to the electromagnet by the support made of synthetic resin that supports the fixed contactor.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention with an on-state cover removed, FIG. 2 is a front view of an off state with a handle, FIG. 3 is a front view of an off state with an electromagnet, and FIG. Is a front view of a trip state, FIG. 5 is a front view of the proposed example in an ON state, and FIG. 6 is a front view of the trip state. 1 ... Handle, 2 ... Movable contactor, 3 ... Current detector, 4 ... Open / close / trip mechanism, 5 ... Movable contact, 6 ...
… Fixed contact, 7… Fixed contact, 9 …… Electromagnet, 10 ……
Arc extinguishing grid, 11 …… arc traveling plate, 13 …… power supply terminal,
21 ... Support plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-95277 (JP, A) Actual development S 50-87455 (JP, U) JP-B 45-1692 (JP, B1) S-49 13732 (JP, Y1)

Claims (1)

(57) [Claims] 1. A power supply terminal, a fixed contactor which is connected to the power supply terminal and has a fixed contact supported by a support made of synthetic resin, and a forward position where the fixed contact is in an ON state and a backward position where the fixed contact is in an OFF state. An electromagnet that controls the support so as to be movable between a position and a position, a movable contact having a movable contact that comes in contact with and separates from the fixed contact at the forward position, and an electric current that turns the movable contact on and off by operating a handle. An opening / closing / tripping mechanism having a configuration for tripping by a detection unit, one end of which is connected to the power supply terminal so that an intermediate part approaches the fixed contact in the ON state and the other end moves from the intermediate part to the movable part. An arc traveling plate extending in the vicinity of the contact opening position of the movable contact along the opening / closing direction of the contact, the other end of the arc traveling plate and the contact opening position of the movable contact. Remote-controlled circuit breaker comprising a arc-extinguishing grid disposed between.