JPH0789465B2 - Remote control type circuit breaker - Google Patents

Description

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

[Background technology]

In the conventional remote control type circuit breaker, a drive part of an electromagnet is connected to a manual handle for turning the circuit on and off. Therefore, the circuit can be turned on and off by the handle, and the circuit can be turned on and off even when the electromagnet is driven by the remote signal.

However, when it is necessary to prevent the load circuit from being turned on for control or other reasons, that is, to prioritize off, the remote control type circuit breaker described above operates the handle by operating the handle even if the electromagnet is turned off. In addition to being able to turn on, the circuit can be turned on by the electromagnet even when turned off by the handle, so there is a drawback that the above-mentioned need cannot be met.

[Object of the Invention]

An object of the present invention is to provide a remote control type circuit breaker having an off priority function.

[Disclosure of Invention]

The present invention provides opening / closing / tripping means having a structure in which the movable contact can be moved to an on position and an off position by operating a handle, and the movable contact is trip-opened in association with the operation of the abnormal current detection unit, A fixed contact having a cushioning spring that opposes the movable contact and absorbs a shock at the time of contact with the movable contact, and an ON position of the movable contact of the fixed contact and a position separated from the movable contact. Positioning the fixed contact so that the buffer spring is biased with the electromagnet to be controlled and the movable contact in the off position and the fixed contact facing the on position of the movable contact. And a fixed contact stopper.

According to the present invention, the fixed contact is controlled by the electromagnet so that the movable contact is turned on and the position separated from the movable contact. Therefore, even if the electromagnet that turns off the movable contact is driven by the handle, the contact is driven. Does not turn on, and the contact does not turn on even if the handle that turns off the fixed contact with the electromagnet is operated. That is, the off-priority function is provided. Since the fixed contact is provided with the impact spring that absorbs the impact when the movable contact contacts, the impact applied to the electromagnet at the time of closing can be mitigated and the contact bounce can be reduced. Further, the buffer spring may have a simple structure and a small storage space as compared with the link mechanism. Moreover, since the fixed contactor stopper supports the buffer spring in the biased state with the movable contactor in the off position and the fixed contactor in the on position, the movable contactor is turned off from the on position. Even if the fixed contactor is controlled by the electromagnet when it is in the position, there is little change in the operating characteristics of the electromagnet.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 8. That is, this remote control type circuit breaker can move the movable contactor 6 between the on position and the off position by operating the handle 5 and also trips the movable contactor 6 in association with the operation of the abnormal current detector 10. And a fixed contactor 7 having a buffer spring 7a that opposes the movable contactor 6 and absorbs the impact when the movable contactor 6 comes into contact, and the fixed contactor 7 To the ON position of the movable contact 6 and the position separated from the movable contact 6, and the movable contact 6 is in the OFF position and the fixed contact 7 is ON of the movable contact 6. And a fixed contact stopper 48 for positioning the fixed contact 7 so as to bias the buffer spring 7a in a state of facing the position.

Explaining in detail below, the case 1 has a side opening, and the opening is closed by a cover (not shown). A load terminal 2 and a power supply terminal 3 formed of a plug-in metal fitting are arranged at both ends of the case 1. The opening / closing means 4 is a handle 5,
It is composed of a movable contact 6, a fixed contact 7 and a reversing spring 8. The trip means 9 is composed of an abnormal current detector 10, a latch link 11 and a trip link 12, which are made of bimetal. The handle 5 is pivotally supported by a fixed shaft 13 at the upper part of the case 1, the upper end thereof projects from the hole 14, and the reset leg 5a is formed at the lower end. The lower end hook portion 16 of the reversing spring 8 engages with the hole 15 in the middle of the movable contact 6, and the upper end 17 of the movable contact 6 engages with the middle of the trip link 12 to urge the movable contact 6 upward. , The upper end 18 of the movable contact 6 is locked in the lower end locking recess 19 of the handle 5, and the movable contact 20 is provided at the lower end of the movable contact 6, and the reversing spring 8 is provided.
As a result, the lower end portion is urged to rotate in the clockwise direction in FIG. 1, and the rotating position is restricted by the movable contact stopper 21 formed on the case 1. The movable contact 6 is plate-shaped and has a hole or notch through which the reversing spring 8 and the trip link 12 pass in the middle. The abnormal current detector 10 has its upper end mounted in a suspended posture on the upper folded portion 23 of the terminal plate 22 of the load terminal 2, and the posture is adjusted by the adjusting screw 24 screwed into the terminal plate 22. The upper end of the latch link 11 is pivotally supported near the handle 5 by a fixed shaft 25 and is arranged substantially parallel to the abnormal current detecting unit 10. The lower end 10a of the abnormal current detecting unit 10 is provided inside the folded-back portion 26 at the lower end. Positioned, the folded-back portion 26 faces the lower end 10a of the abnormal current detection portion 10. Further, the latch link 11 has a hook portion 27 in the middle. Trip link 12
Has one end rotatably supported by the fixed shaft 28 on the case 1, a reset projection 29 is provided at the intermediate portion thereof next to the locking portion of the reversing spring 8, and the tip locking portion 30 is hooked on the latch link 11. Department
It is latched to 27.

The electromagnet 31 is disposed adjacent to the opening / closing means 4 of the case 1, and has a groove 7e of the insulating connector 7b of the fixed contact 7 at the lower end 32a of the armature 32 thereof, as shown in FIGS. Connect by caulking and fixing, and by providing a protrusion (not shown) at the end of the insulating connector 7b, caulking and fixing it in the hole 7f of the fixed contact holder 7c, storing the buffer spring 7a inside it, and fixing contact Fixed contact plate 7d in square holes 7g formed on both sides of child holder 7c
The stopper engaging portions 7h and the wire connecting portions 7k at both ends of the are loosely fitted, and the fixed contact plate 7d is pressed and supported by the tip of the buffer spring 7a. The fixed contact 33 provided outside the contact position of the buffer spring 7a faces the movable contact 20. In this way, by providing the buffer spring 7a, it is possible to prevent the buffer when the movable contact 6 is closed from being applied to the electromagnet 31, and to reduce the contact bounce. As shown in FIG. 2, the electromagnet 31 is of a polar type, and a coil 35 is wound around a coil frame 34, and a U-shaped first yoke 36 is provided on one side of the coil frame 34. The second yoke 38 is opposed to 36a via the permanent magnet 37. The armature 32 penetrates the coil frame 34, and the upper end 39 thereof is attracted to the upper end 36b of the first yoke 36 by the permanent magnet 37 and the lower end thereof is attracted to the second yoke 38 to be in a stable state. At this time, the position of the fixed contact 33 of the fixed contact 7 fixed to the armature 32 is located at the ON position of the movable contact 6, and the movable contact 6 is pushed toward the opening side of the movable contact stopper 21. Hold in position. That is, the attractive force of the permanent magnet 37 is generated by the movable spring 6 by the return spring 8.
It is set larger than the pressing force of. When the coil 35 is energized, the magnetic flux flows through the first yoke 36 and the armature 32 as a closed circuit, so that the lower end 32 of the armature 32 is closed.
a moves to the first yoke 36 side and separates the fixed contact 7 from the position of the movable contact 6 in the ON state in the direction opposite to the OFF operation direction of the movable contact 6, while the movable contact 6 moves. The off state is formed by the electromagnet 31 supported by the contact stopper 21. Further, a fixed contact stopper 48 is provided in the vicinity of the movable contact stopper 21 so as to face the stopper locking portion 7h at one end of the fixed contact plate 7d, so that the movable contact 6 is in the off position and the fixed contact 7 is in the on position. At a certain time, as shown in FIG. 6, the stopper engaging portion 7h of the fixed contact plate 7d is engaged, and the buffer spring 7a is compressed into a biased state. The armature 32 is a yoke 36,3.
In FIG. 8, the permanent magnet 37 is held by the yokes 36, 38 only by the attracting force of the permanent magnet 37, but since the attracting force is considerably strong, the armature 32 does not move in the longitudinal direction. Figure 4 shows the armature 37.
The relationship between the suction force and the spring load is shown. That is, the vertical axis is the attraction force and spring load, the horizontal axis is the armature stroke, Q ₁ is the non-excitation attraction force curve, Q ₂ is the attraction force curve when the movable contact is on, and Q ₃ is the attraction force when the movable contact is off. Curve, Q ₄
Is the spring load when the movable contact is on, and Q ₅ is the spring load when the movable contact is off. The holding force of the permanent magnet 37 with respect to the fixed contact 7 in the ON state of the fixed contact 7 and the movable contact 6 is A, and when the electromagnet 31 is excited and becomes the operation attraction force, the armature 32 operates to move the first yoke. Move to the 36 side,
When the excitation is released, it becomes non-excited, so that the permanent magnet 37 moves the armature 32 to the second yoke 38 side. In this case, when the movable contact 6 is turned on, the moving attraction force of the electromagnet 31 becomes the spring load Q ₄ , but when the movable contact 6 is turned off, the fixed contact 7 is restricted by the fixed contact stopper 48. The spring load becomes Q ₅ , and when the movable contact 6 is turned on and off, the change in the operating characteristics with respect to the electromagnet 31 decreases from the curve Q ₂ to the curve Q ₃ . On the other hand, when the fixed contact 7 is not regulated by the fixed contact stopper 48, the operation attraction force curve Q _{3 ′} when the movable contact is off is far apart from the curve Q ₂ as shown in FIG. 31 has the drawback that the operating characteristics greatly change.

The electric circuit of this circuit breaker includes a load terminal 2, a terminal plate 22, an abnormal current detection unit 10, a flexible electric wire 46 welded to the lower end of the abnormal current detection unit 10, and a movable contactor to which the flexible electric wire 46 is welded.
6, movable contact 20, fixed contact 33, fixed contact plate 7d, flexible electric wire 47 welded to fixed contact plate 7d, and power supply terminal 3 connected to the flexible electric wire 47.

In addition, 40 is a light emitting diode for displaying the exciting operation of the electromagnet 31, 41 is its window, 42 is an arc extinguishing grid, 43 is a gas exhaust hole,
Reference numeral 44 is a window for adjusting the adjusting screw 24.

The operation of this remote control type circuit breaker will be described. That is, FIG. 1 is in the ON state. In this case, the electromagnet 31 is in a non-excited state, the fixed contact 7 side of the armature 32 is attracted to the second yoke 38, and the handle 5 is tilted to the left. Therefore, the movable contact 20 and the fixed contact 33 are in contact with each other. The contact pressure of the movable contact 6 is applied by the return spring 8 and the buffer spring 7a. At this time, the stopper engaging portion 7h of the fixed contact 7 is fixed to the fixed contact stopper 48.
Away from.

FIG. 6 shows an off state by operating the handle 5. When the handle 5 is rotated to the right with the fixed shaft 13 as a fulcrum in the state shown in FIGS. 1 to 6, the movable contact 6 exceeds the upper end 17 of the return spring 8 and is biased in the reverse direction to move the movable contact 6 to the upper end. It rotates counterclockwise around 18 and the lower end of the movable contact 6 stops.
The movable contact 20 is separated from the fixed contact 21 by being regulated by 45. As a result, even if the electromagnet 31 is driven, the fixed contact 7
Cannot move to the off position of the movable contact 6, so the circuit cannot be turned on by the electromagnet 31.
Off priority will be realized. Further, at this time, the stopper 7a of the fixed contact 7 is locked to the fixed contact stopper 48 by the restoration of the buffer spring 7a.

FIG. 7 shows a case where the electromagnet 31 is turned off. In the ON state of FIG. 1, when a remote signal is applied to the electromagnet 31 and the rated current is applied to the electromagnet 31, the armature is excited.
32 rotates around the upper end toward the first yoke 36 side, and the fixed contact 7 is separated from the movable contact 6. At this time, since the movable contact 6 is biased by the return spring 8 and tries to rotate in the same direction, it is restricted by the movable contact stopper 21. As a result, the circuit is off even if the handle 5 is in the on position. Therefore, when the electromagnet 31 is excited, no matter how the handle 5 is operated, the handle 5 is not turned on, and in this case as well, the off priority is realized. On the other hand, when the excitation of the electromagnet 31 is released, the fixed contact 7 is restored by the permanent magnet 37, so that the fixed contact 33 comes into contact with the movable contact 20 and the circuit can be turned on by the remote signal.

FIG. 8 shows a state of overcurrent trip. In the ON state of FIG. 1, when an overcurrent exceeding the rated current flows in the electric circuit,
The abnormal current detection unit 10 is self-heated and curved like an imaginary line, and its lower end 10a pushes the folded portion 26 of the latch link 11, so that when the latch link 11 is slightly rotated clockwise, the tip of the trip link 12 is turned. The locking part 30 is the latch link 11
Is pulled out from the hook portion 27 of. Since the trip link 12 is biased clockwise by the return spring 8 about the fixed shaft 28 as a fulcrum, the trip link 12 rotates to the position shown in FIGS. 1 to 8, and at that time, the upper end 17 of the return spring 8 moves the movable contact 6 Movable contact 6 for crossing
Is biased in the reverse direction to open the contact. The maximum opening position is regulated by the stopper 45 of the case 1, and the upper end 18 of the movable contact 6 rotates counterclockwise around the stopper 45 as a fulcrum, hits the reset projection 29 of the trip link 12, and is just the handle 5.
Is held in a neutral posture. As a result, handle 5
The trip display will be made depending on the neutral posture.
Further, the stopper engaging portion 7h of the fixed contact 7 is engaged with the fixed contact stopper 48.

The reset after the trip is performed by tilting the neutral handle 5 to the off side. That is, when the handle 5 is turned off, the reset projection 29 is pushed by the reset leg 5a of the handle 5, the trip link 12 is rotated counterclockwise, and its tip locking portion 30 is latched by the hook portion 27 of the latch link 11. Then, it is turned off manually as in FIG.

With this configuration, even if the circuit is turned off by either the electromagnet 31 or the handle 5, the off priority function in which the circuit is not turned on by the other can be realized, and the demand for the off priority function can be met. it can. Further, the opening / closing / tripping means 4, 9 of this embodiment is a quick-insertion type mechanism having a reversing spring 8 so that the contact closing speed is fast, but since the fixed contact 7 is provided with the buffer spring 7a, the contact opening by operating the handle 5 is performed. The armature 32 of the electromagnet 31 will not be separated from the stable position due to the impact at the time, and the contact bounce can be reduced, and also contributes to the contact pressure. Further, the buffer spring 7a may have a simple structure and a small storage space as compared with the link mechanism. Further, since the stopper locking portion 7h of the fixed contact 7 is locked to the fixed contact stopper 48 and the buffer spring 7a is restricted to the biased state, the operating characteristics of the electromagnet 31 change depending on whether the movable contact 6 is on or off. Is less.

A second embodiment of the present invention is shown in FIGS. 9 to 13.
That is, in this embodiment, the fixed contact 7 is of a rotary type. First, a groove 51 at the base end portion of the interlocking member 50 is caulked and fixed to the lower end portion of the armature 32, and a shaft 52 is provided at the tip thereof.
As shown in FIG. 10, the fixed contactor 7 is composed of a fixed contactor plate 53 and a holder 54, the shaft holes 55, 55 ′ of which are rotatably supported by a fixed shaft 55 a fixed to the base 1, and the holder. The shaft 52 is slidably fitted into the elongated hole 56 of the shaft 54. Fixed contact plate 53
The stopper engaging portion 53a at the tip of the is loosely fitted in the square hole 57 of the holder 54, and the base end 53b is loosely fitted in the square hole 58 of the holder 54, and the fixed contact 33 is provided on the tip 53 side. A buffer spring 7a is compressed and interposed between the back side and the holder 54 facing the back side. Then, the flexible electric wire 47 is connected to the base end portion 53b of the fixed contact plate 53.

With this configuration, in the ON state of FIG. 9, the fixed contact 7 is in an upright state with the fixed shaft 55a as a fulcrum, and the buffer spring 7
a is also compressed and the contact pressure is applied. Further, the shock generated by the movable contactor 6 when the contact is closed is absorbed by the buffer spring 7a, so that the armature 32 does not open.
Contact bounce can also be reduced. FIG. 11 shows the handle 5 in the off state, in which case the stopper engaging portion 52
a is locked to the fixed contact stopper 48. Figure 12 shows electromagnet 3
It is in the off state due to 1, but at this time the armature 32 moves so that the interlocking member 50 retracts from the fixed contactor 7
52 slides in the elongated hole 56 to pull the fixed contactor 7, and the fixed contactor 7 is tilted counterclockwise about the fixed shaft 55a as a fulcrum, separated from the movable contact 20 at the on position, and the circuit is separated. Turns off. Further, although FIG. 13 shows a trip state, its operation is the same as that of the first embodiment.

FIG. 14 shows a modification of the second embodiment. FIG. 14B shows the case where the reversing spring 8 has a strong spring force, and FIG. 14A showing the second embodiment shows the movable contact stopper 21. While the movable contact 6 is separated from the movable contact 6, the movable contact 6 is locked to the movable contact stopper 21. On the contrary, FIG. 7C shows the case where the fixed contact 7 is locked to the fixed contact stopper 48 even when the movable contact 6 is in the ON position because the buffer spring 7a is strong. Each of these cases is also common in that there is little change in the operating characteristics of the electromagnet 31 when the movable contact 6 is in the on position and in the off position.

The electromagnet of the present invention may have any structure as long as the fixed contact can be driven to the ON position and the separated position of the movable contact by a remote signal, and the structure is not limited to the polar type, and for example, the armature 32. May be an electromagnet that reciprocates in the axial direction. Further, the opening / closing / tripping means is not limited to the above-mentioned embodiment, but the movable contact can be moved to the ON position and the OFF position by the operation of the handle, and the movable contact can be interlocked with the abnormal current detector. It suffices if it has a configuration for trip opening. Further, the buffer spring may be provided between the fixed contact and the fixed contact body, or may be provided between the fixed contact and the electromagnet.

〔The invention's effect〕

According to the present invention, the fixed contact is limited by the electromagnet between the on position of the movable contact and the position separated from the movable contact. Therefore, when the movable contact is turned off by the handle, the contact is made even if the electromagnet is driven. Does not turn on, and when the fixed contact is turned off by the electromagnet, the contact does not turn on even if the handle is operated. That is, the off-priority function is provided. Further, since the fixed contact is provided with the buffer spring for alleviating the impact at the time of contact of the movable contact, it is possible to alleviate the buffer applied to the electromagnet at the time of closing and reduce the contact bounce. Further, the buffer spring may have a simple structure and a small storage space as compared with the link mechanism, and the fixed contact stopper prevents the movable contact from being in the off position and the fixed contact to be in the on position. In order to support the buffer spring in a biased state,
Even if the fixed contact is controlled by the electromagnet when the movable contact is in the ON position and the OFF position, there is an effect that the change in the operating characteristic of the electromagnet is small.

[Brief description of drawings]

1 is a front view of a first embodiment of the present invention with an on-state cover removed, FIG. 2 is a perspective view of an electromagnet thereof, FIG. 3 is an exploded perspective view of a fixed contact, and FIG. Shows the attraction force and spring load characteristic diagram of the armature, FIG. 5 shows the attraction force and spring load characteristic diagram of the armature when there is no fixed contact stopper, and FIG. 6 shows the front view of the manual off state with the cover removed. FIG. 7 is a front view of the remote-off state with the cover removed, FIG. 8 is a front view of the trip state, and FIG. 9 is a front view of the second embodiment with the on-state cover removed. FIG. 10 is an exploded perspective view of the fixed contact, FIG. 11 is a front view of a state in which a cover in a manual off state is removed, and FIG. 12 is a front view in a state of a cover in a remote off state, and FIG. Is a front view of the trip state, and FIG. 14 is a side view of a part of a cross section showing a modified example. It 4 ... Opening / closing means, 5 ... Handle, 6 ... Movable contact,
7 ... Fixed contact, 7a ... Buffer spring, 9 ... Trip means, 10 ... Abnormal current detection part, 31 ... Electromagnet, 48 ... Fixed contact stopper

Claims (4)

[Claims] 1. An opening / closing / tripping means having a structure in which the movable contact can be moved to an on position and an off position by operating a handle, and the movable contact is tripped to open in conjunction with the operation of an abnormal current detection unit. A fixed contact having a cushioning spring that opposes the movable contact and absorbs an impact at the time of contact with the movable contact; an on position of the fixed contact and a position separated from the movable contact. And the movable contactor is in the off position and the fixed contact faces the on position of the movable contact so that the fixed contactor is positioned so that the buffer spring is biased. Remote control circuit breaker with fixed contact stopper. 2. The remote control type circuit breaker according to claim 1, wherein the fixed contact is integrally connected to the movable portion of the electromagnet. 3. The remote control type circuit breaker according to claim 1, wherein the fixed contact is rotatably supported by a fixed shaft. 4. The remote control type circuit breaker according to claim 1, wherein the electromagnet is a polar electromagnet that holds the fixed contact at the ON position of the movable contact.