JPH0636666A - Remote control circuit breaker - Google Patents

Abstract

PURPOSE:To put an indication of TRIP on a control handle portion, together with those of ON and OFF. CONSTITUTION:A display board 54 is disposed coaxial with and inside a control handle 2 and indications of ON 58, TRIP 59 and OFF 60, provided on the surface of the display board, can be seen from a handle hole 4 via the display windows 63, 64 of the control handle 2. The display board 54 is rotated synchronous with the ON-OFF operation of the control handle 2 so that the indications of ON 58 and OFF 60 can be seen alternately from the respective display windows 63, 64. During tripping the control handle 2 remains held in its ON position, while the display board 54 is pushed by a movable contact holder 9 being turned off by an arm 57 and is rotated counterclockwise, so that the indication of TRIP 59 can be seen from the display window 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control type circuit breaker for remotely controlling an opening / closing mechanism section using a bistable polarized electromagnet device.

[0002]

2. Description of the Related Art In the above circuit breaker, an operating handle and a polar electromagnet device are connected via a link,
When the armature of the polarized electromagnet device is attracted to the on side or the off side by the control signal, the operating handle is turned on and off, and is held at the on position or off position as it is. Therefore, the operation handle is fixed to either the on position or the off position depending on the attracted state of the polarized electromagnet device at that time.

[0003]

Therefore, even if the circuit breaker of this type trips due to the occurrence of overcurrent and the main contact is in the open state, the operating handle is kept in the ON position, and the handle position is kept. Cannot determine the occurrence of a trip. Therefore, it is known that the movement of the opening / closing mechanism at the time of trip operation is taken out by a dedicated part and the trip display plate on the surface of the main body is driven to display the trip (JP-A-59-99636).
(See Japanese Patent Application No. 4-59304). However, the conventional trip display mechanism is difficult to see because the trip is displayed in a place different from the on / off display of the operation handle portion, and because it has an independent link mechanism, the number of parts and the number of assembly steps are large and the cost is high. There was a problem.

On the other hand, in the remote control type circuit breaker, since the main body of the circuit breaker and the operation switch are separated from each other, there is a risk that the operation switch side is inadvertently turned on while the main body is working. It was The present invention addresses the above-mentioned problems, and can display the three states of ON / OFF and trip of a circuit breaker collectively in the operation handle portion, and the configuration therefor is simple and the cost is low. It is intended to provide a circuit breaker. It is another object of the present invention to provide a safe remote control type circuit breaker that is not inadvertently turned on even after a trip operation occurs.

[0005]

SUMMARY OF THE INVENTION In order to display the three states of on / off and trip collectively on an operating handle portion, a remote control type circuit breaker of the present invention holds a movable contactor to perform an on / off motion. A movable holder,
A latch that is rotatably attached to the holder and is biased in one direction by a spring, and a handle that is detachably connected to the holder via the latch and that projects from a body frame is turned on and off by the on / off operation of the body. A rotatable operation handle having display windows that are alternately viewed through the handle hole of the frame, and is arranged inside the operation handle so as to rotate concentrically therewith, and is turned on at one end in accordance with the display window. Display, OFF display and trip display in between, and a display plate having an arm that is spring-biased at the other end and abuts against the holder, and a pulling plate that biases the holder in the OFF direction. A bistable polar electromagnet device that is connected to the release spring via the operation handle via a link and operates the operation handle in response to a control signal to alternately maintain the on position and the off position. A tripping device that detects an overcurrent and acts on the latch to disconnect the operating handle and the holder to turn off the holder by the tripping spring. During the on / off operation of, the ON display and the OFF display are rotated in synchronization with the operation handle while being visible from the display window, and when the holder is turned off by the action of the tripping device, the holder is pushed by this. It is assumed that the trip display can be seen from the display window that is rotated through the operation handle in the on position and viewed through the handle hole.

In the above circuit breaker, a trip lever for manually actuating the trip device is mounted on the body frame, and the trip lever can be locked at a position further advanced from the trip position for actuating the trip device. In addition, by locking a part of the operation handle at the on position or the off position at the lock position to lock the operation handle, the easy reset after the trip operation is prohibited and the operation is continued. It is possible to prevent the on operation and also prevent the inadvertent on operation from the off state.

[0007]

According to the present invention, a display plate common for displaying on / off and trips is arranged inside the operation handle so as to rotate concentrically therewith, and the display portion can be seen from a display window provided on the operation handle. At the same time, the display plate is brought into contact with the holder for holding the movable contactor to interlock with the holder. When the operation handle is turned on and off, the operation handle and the holder move while keeping the connection, so that the display plate is synchronized with the operation handle while the on display and the off display are visible from the corresponding display windows. The tripping device that acts on the latch during tripping releases the connection, and only the holder is turned off by the force of the tripping spring while the operation handle is held in the on state. By utilizing this, the display plate with which the arm abuts is rotated with respect to the operation handle at the ON position to switch the display of the display window from the ON display to the trip display. According to such a configuration, the three displays of ON, OFF and trip are integrated in the operation handle portion, and only the single display plate is required to be incorporated at the same time as the operation handle.

Further, the trip lever for manually operating the trip device is locked at a position further advanced from the trip position, and at this position, a part of the trip lever is fitted into the operation lever at the ON position or the OFF position. Lock this in place. In order to reset the tripped circuit breaker, that is, to reconnect the operating handle and the holder, it is necessary to return the operating handle that was kept in the on position after the trip to the off position. If the trip lever is locked in the ON position, inadvertent resetting, and subsequent ON operation is also disabled, and there is no danger of sudden ON due to erroneous operation from a distance. Similarly, if the operating handle is locked at the off position, an unexpected on operation will not occur.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a vertical cross-sectional view of the circuit breaker in an ON state, FIG. 2 is a plan view thereof, FIG. 3 is a vertical cross-sectional view of the circuit breaker in an OFF state of FIG. 1, FIG. 6 is a longitudinal sectional view of the same in a trip state, FIG. 6 is a plan view thereof, FIG. 7 is an enlarged view of the opening / closing mechanism portion in FIG. 1, and FIG. 8 is a view at the moment when the trip lever of FIG. 7 is operated. First, the overall configuration of the circuit breaker of the embodiment will be described with reference to FIGS. 1, 2 and 7. In these figures, 1 is a main body frame made of molded resin, 2 is a disc-shaped operation handle rotatably supported by a shaft 3, and the operation handle 2 is projected from a handle hole 4 of the main body frame 1 to the outside. And a latch pin 6 is provided on the arm portion extending substantially opposite to the handle 5.
Have been planted.

On the other hand, 7 is a movable contact having a movable contact 8,
Reference numeral 9 is a mold resin holder for holding the holder.
Is rotatably supported on the body frame 1 by a shaft 10. A cylindrical boss 11 is formed concentrically with the shaft 10 on the front side surface of the holder 9 in the drawing, and the plate-shaped movable contact 7 is rotatably fitted to the boss 11. Reference numeral 12 is a contact spring formed of a compression coil spring, which is inserted between the spring receiving piece 13 (FIG. 7) of the movable contact 7 and the spring receiving seat 14 (FIG. 7) of the holder 9 to move the movable contact 7 to the boss 11. It is biased counterclockwise in the figure with the fulcrum as the fulcrum. The movable contactor 7, which receives the force of the contact spring 12, hits the stopper 15 (FIG. 7) of the holder 9 and stops, and is in a state of being integrated with the holder 9 at that position.

A reference numeral 16 designates a latch rotatably supported by a holder 9 on a shaft 17, and a return spring 18 which is a torsion spring mounted between the holder 9 and the holder 9 serves as a fulcrum to pivot the shaft 17 in a clockwise direction in the figure. Being energized. The return spring 18 has a twisted portion inserted into a pin implanted in the holder 9, one end of which is locked by the holder 9 and the other end of which acts on the pin 19 implanted in the latch 16. . The latch 16 is provided with a groove 20, and the latch 16 biased by the return spring 18 always has the groove 20 fitted into the latch pin 6 of the operation handle 2. As a result, the operation handle 2 is connected to the holder 9 via the latch 16, and the operation handle 2 is connected as described later.
The holder 9 is interlocked with the on / off operation of.

In FIG. 1, reference numeral 21 is a polar electromagnet device for operating the operating handle 2 on and off. The polarized electromagnet device 21 includes an inner yoke 23 that encloses the electromagnetic coil 22 and an outer yoke 25 that is in contact with the inner yoke 23 through a permanent magnet 24.
A round bar-shaped armature 28 having contact plates 26 and 27 at both ends is guided by the electromagnetic coil 22 and slides up and down in FIG. When the circuit breaker is on, the contact plate 26 is attracted to the lower end of the outer yoke 25 in the figure by the magnetic flux of the permanent magnet 24, and the operating handle 2 connected to the armature 28 via the link 29 is in the on position. Hold on. When the circuit breaker to be described later is turned off, the contact plate 27 is attracted to the upper end portion of the outer yoke 25.

Reference numeral 30 is a thermal / electromagnetic trip device, in which a trip coil 33 is wound around an iron core 32 fixed to a yoke 31, and an armature 34 for instantaneous trip is provided at the tip of one leg of the yoke 31. Is rotatably supported. The armature 34 is kept in a state in which the armature 36 is pulled up from the iron core 32 by a return spring 35 formed of a tension coil spring mounted between the armature 34 and the yoke 31, and in that state, the driving end 37 on the opposite side is held by the latch 16. It faces the slope of the tip with a gap. A holding plate 38 is provided outside the yoke 31.
And a bimetal 39 is cantilevered at one end thereof. The free end of the bimetal 39 is connected to the movable contact 7 via a flexible lead wire 40, and the tip of the bimetal 39 faces the pin 19 implanted in the latch 16 with a gap. The other end of the holding plate 38 is fixed to the body frame 1 integrally with the yoke 31, and one end of the trip coil 33 is connected to this portion.

Reference numeral 41 is a fixed contact having a fixed contact 42.
One end thereof is connected to the power supply side terminal 43, and the other end thereof extends to the arc extinguishing chamber 44. Further, 45 is a load side terminal, to which the other end of the trip coil 33 is connected. 46
Is a trip lever for manually actuating the trip device 30 and is slidably held in the guide groove 47 of the main body frame 1 in the left-right direction in the figure, and as shown in FIG. 7, the handle 48 and the armature 34 are projected outward. It includes a piece 49 and a driving piece 50 facing the piece 49. The rear half of the trip lever 46 is made slightly thin so as to be elastically deformable in the vertical direction of FIG. 7, and the end portion thereof has a chevron projection 51 formed on the main body frame 1 so as to project into the guide groove 47. A chevron-shaped projection 52 is formed which abuts against the elastic deformation and overcomes the elastic deformation. Reference numeral 53 in FIG. 1 is an auxiliary terminal for connecting the external operation circuit to the polar electromagnet device 21.

The display board 5 is provided inside the operation handle 2.
4 are provided. As shown in FIG. 7, the display plate 54 has a configuration in which a fan-shaped display portion 56 and a rod-shaped arm 57 are formed with a disc-shaped boss portion 55 interposed therebetween.
A collar 56a for forming a display surface of an appropriate width on the circular arc surface of 6
Is provided. Then, on the outer surface of the brim portion 56a, in the circumferentially equally divided portion, in order from the left side of FIG. 7, an ON display (character "ON") 58 and a trip display ("TRI"
P) 59) and off display (“OFF”)
60 is written.

On the other hand, inside the operation handle 2, a circular concave portion for loosely fitting the boss portion 55 of the display plate 54 and fan-shaped concave portions 61 and 62 for accommodating the display portion 56 and the arm 57.
And a display window 63 and 64 communicating with the outside from the recess 61 are provided on both sides of the handle 5. The display plate 54 is inserted into the space of the operation handle 2 and the shaft 3 is inserted into the central hole of the boss portion 55, so that the display plate 54 is held in the operation handle 2 so as to rotate concentrically therewith. The display plate 54 is biased in the clockwise direction in FIG. 7 by the compression spring 65 inserted between the display plate 54 and the operation handle 2, and the arm 57 is pressed against the shoulder portion 66 of the holder 9.

In this state, the display portion 56 and the concave portion 61 are shown in FIG.
The right end faces of the above are close to each other, and there is a margin between the left end faces that is slightly larger than 1/3 of the central angle of the display unit 56.
On the other hand, the left end faces of the arm 57 and the recess 62 are close to each other, and a margin of the same extent as the above margin exists between the right end faces. That is, the display board 54 is changed from the ON state of FIG.
Can be rotated counterclockwise with respect to the operation handle 2 within the above-mentioned margin. Then, in the illustrated ON state, the ON display 58 on the collar portion 56a faces the display window 63, the OFF display 60 faces the display window 64, and only the display window 63 looks through the handle hole 4 and the display window 64.
Is hidden by the body frame 1. Therefore, the ON display 58 is visible through the display window 63 in the state of FIG.

Reference numeral 67 denotes a trip spring which is a torsion spring concentric with the shaft 3 and has one end locked to the operation handle 2 and the other end acting on the shaft 17 connecting the latch 16 to the holder 9.
The trip spring 67 connects the holder 9 to the shaft 10 via the shaft 17.
With the fulcrum as a fulcrum, it is always urged in the clockwise direction, that is, the off direction. However, in the ON state, the holder 9 is locked to the latch pin 6 via the latch 16 and held in the illustrated state. Reference numerals 68 and 69 in FIG. 7 denote lock grooves provided on the outer peripheral surface of the operation handle 2 so as to face the tip end portion 70 of the trip lever 46 in the illustrated on state and the off state described later,
By inserting the tip portion 70 into this, the operation handle 2 is locked so as not to rotate at each position.

Reference numerals 71 and 72 in FIG. 1 are changeover switches composed of microswitches for changing the polarity of the operating voltage for the polar electromagnet 21 via a diode (not shown).
As for the changeover switch 71, the actuator is the operation handle 2
Of the holder 9 and the actuator of the changeover switch 72 is operated. Reference numeral 75 denotes a hook made of a wire rod that is hung between the armature 34 of the armature 34 and the holder 9 and is used when the tripping device 30 trips the armature 34 later.
Serves to supplementarily drive the holder 9 to increase the opening speed.

Next, the operation will be described. In FIG. 1, the current flows from the terminal 43 to the fixed contact 41 and the fixed contact 4.
2, the movable contact 8, the movable contact 7, the lead wire 40, the bimetal 39, the trip coil 33, and the current to the terminal 45.
Here, when an operating voltage is momentarily applied to the polarized electromagnet 21 from the external operating circuit, the armature 28 is driven upward in the figure, the contact plate 27 contacts the outer yoke 25, and at that position (off position). The permanent magnet 24 is attracted by the magnetic flux of the permanent magnet 24. Along with this, the operation handle 2 is driven via the link 29, and is rotated counterclockwise in the figure by an angle corresponding to the stroke of the armature 28. As a result, the display window 63 is hidden inside the main body frame 1, and the display window 64 can be seen through the handle hole 4.

On the other hand, in FIG. 7, when the operation handle 2 is rotated, the latch pin 6 moves to the right in the figure.
The holder 9 is rotated clockwise by the force of the tripping spring 67 acting via the shaft 17 to the position shown by the chain double-dashed line, and the movable contactor 7 integrated with the holder 9 is moved from the fixed contactor 41. When opened, the circuit breaker turns off. At this time, the display plate 54 is pushed counterclockwise by being pushed by the shoulder portion 66 of the holder 9 with which the arm 57 abuts, but the turning angle is set so as to be synchronized with the operation handle 2 which has been turned off. The positional relationship of the display plate 54 with respect to the operation handle 2 is maintained in the state of FIG. 7 even after the rotation. As a result, the off display 60 still faces the display window 64, so that the off display 60 can be seen through the display window 64 seen through the handle hole 6. This off state of the circuit breaker is shown in FIGS. The off operation is also performed by manually tilting the handle 5 of the operation handle 2 to the left in FIG.

From the off state of FIG.
When an operating voltage is applied to or the handle of the operating handle 2 is tilted to the right, the armature 28 descends and the armature plate 26 is attracted to the outer yoke 25, and the operating handle 2 rotates clockwise. Then, the state of FIG. 1 is maintained again. Along with this, the holder 9 is driven counterclockwise by the latch pin 6 via the latch 16, and the movable contact 7 is pressed by the fixed contact 41 to be in the ON state of FIG. At that time, even after the movable contact 8 comes into contact with the fixed contact 42, the holder 9 is further pushed in while compressing the contact spring 12, and the movable contact 7 is slightly moved from the stopper 15 of the holder 9 as shown in FIG. It will be in a floating state. Thereby, an appropriate contact pressure is applied between the movable contact 8 and the fixed contact 42.

From the ON state of FIG. 7, the trip lever 46
When holding the handle 48 and sliding the chevron projection 52 to the right until it abuts the chevron projection 51 of the main body frame 1,
The protruding piece 49 is pushed by the driving piece 50 to rotate the armature 34 against the return spring 35, and the driving end 37 pushes the latch 16 to rotate the armature 34 about the shaft 17 as a fulcrum, as shown in FIG. As a result, the latch pin 6 is disengaged from the groove 20, and the holder 9 is driven in the OFF direction by the force of the trip spring 67 at the next moment. Further, in conjunction with this, the display plate 54 also has the compression spring 6
Rotate counterclockwise against 5. However, since the operation handle 2 is still held in the ON position by the polarized electromagnet device 21, the display plate 54 rotates with respect to the operation handle 2, and the trip display 59 is displayed through the handle hole 4 in the display window 63. You can see it face to face.

Although the manual trip operation is completed in this state, when the trip lever 46 is further slid thereafter, the trip lever 46 is elastically deformed and the chevron projection 5 is formed.
2 goes over the chevron projection 51 and advances, and the tip portion 70 fits into the lock groove 68 of the operation handle 2. This allows
The operating handle 2 is locked in the on position and the protruding piece 4
The trip lever 46, which receives a force from the return spring 35 via 9 is also locked in a state of overcoming the chevron projection 51.
In this state, the armature 34 pushed by the trip lever 46 further rotates from the state shown in FIG. 8 and reaches the same position as when the armature 36 is attracted to the iron core 32.

5 and 6 show the trip state. In this state, the trip display 59 can be seen from the display window 63, and the lock display (the character "ROCK") 76 written on the upper surface of the trip lever 46 can be seen. To unlock the operation handle 2, the trip lever 46 is pushed back to get over the chevron projection 51. As a result, the trip lever 46 automatically returns to the state of FIG. 7 by the force of the return spring 35.

In the trip operation, the bimetal 39 bends downward in FIG. 5 to push down the pin 19 due to the occurrence of an overload condition, and the armature 34 instantly changes to the condition shown in FIG. 5 due to the generation of a large current such as a short circuit current. It is also performed by being sucked and rotating the latch 16. Then, when the trip lever 46 is slid to the lock position shown in FIG. 5, the operation handle 2 is locked at the ON position. To reset the tripped circuit breaker, the trip lever 46 is returned to the state shown in FIG. 3 to unlock the operating handle 2, and then the operating handle 2 is tilted in the OFF direction to resist the return spring 18. Push the latch 16 away and refit the latch pin 6 into the groove 20. At that time, the armature 34 is automatically returned to the state of FIG. 3 by the action of the return spring 35.

As described above, according to the configuration of the illustrated embodiment, the operation display of the circuit breaker includes not only the on / off displays 58 and 60 but also the trip display 59 as the display window 6 of the operation handle 2.
Since it can be seen from 3, 64, it is easy to see without the need to shift the eyes as in the conventional configuration in which the trip status is displayed in another place. In addition, since the trip display mechanism only needs to coaxially incorporate the display plate 54 inside the operation handle 2, no complicated link mechanism is required, the number of parts and the number of assembling steps are small, and the space is not required. Furthermore, the trip lever 46
Was inserted into the operation handle 2 at the off position, which is the on position at the lock position beyond the trip position, and it was possible to lock this at that position. There is no danger that the operation switch will be turned on accidentally by mistake.

[0028]

According to the present invention, by consolidating the display of ON, OFF, and trip on the operation handle portion, it is possible to eliminate the difficulty of seeing the remote control type circuit breaker in which trips are separately displayed, and to cut a general circuit breaker. You can check the operating status with the same feeling as a container. At that time, since the display plate is only provided inside the operation handle, the structure is simple, the number of parts and the number of assembling steps are small, and the circuit breaker is small because it does not occupy a space. Further, since the trip lever is provided with the lock function of the operation handle, the inadvertent ON operation that often occurs in the remote operation command is eliminated, and the safety is improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a circuit breaker in an on state according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a vertical cross-sectional view of the circuit breaker of FIG. 1 in an off state.

FIG. 4 is a plan view of FIG.

5 is a vertical cross-sectional view of the circuit breaker of FIG. 1 in a tripped state.

FIG. 6 is a plan view of FIG.

FIG. 7 is an enlarged view of an opening / closing mechanism section in FIG.

8 is a diagram showing the moment of a manual trip operation of the opening / closing mechanism of FIG.

[Explanation of symbols]

 1 Main Frame 2 Operation Handle 4 Handle Hole 6 Latch Pin 7 Movable Contact 9 Holder 16 Latch 21 Polarized Electromagnetic Device 29 Link 30 Tripping Device 41 Fixed Contact 43 Power Supply Terminal 45 Load Side Terminal 46 Trip Lever 54 Indicator Plate 56 Indication Part 57 Arm 58 On display 59 Trip display 60 Off display 63 Display window 64 Display window 67 Tripping spring

Claims (2)

[Claims] 1. A rotatable holder that holds a movable contactor to perform an on / off motion, a latch rotatably mounted on the holder and biased in one direction by a spring, and the holder via the latch. It can be connected and disconnected freely,
In addition, a rotatable operation handle having a display window alternately viewed from the handle hole of the main body frame before and after a handle protruding from the main body frame, and a concentric rotation inside the operation handle. The display part has an on-display, an off-display, and a trip display in between, which are aligned with the display window at one end, and an arm that is spring-biased and comes into contact with the holder at the other end. A display plate, a trip spring for urging the holder in the OFF direction, and a link with the operation handle via a link, and the operation handle is operated by a control signal to alternately maintain the ON position and the OFF position. And a bistable polar electromagnet device that detects an overcurrent and acts on the latch to release the connection between the operation handle and the holder, and the holder is operated by the trip spring. And a trip device for performing an off-operation, the display plate is rotated in synchronization with the operation handle while an on-display and an off-display are visible from the display window when the operation handle is turned on and off. When the holder is turned off by the action of the device, the holder is pushed by the holder to rotate with respect to the operation handle in the on position, and the trip display can be seen from the display window seen through the handle hole. Control type circuit breaker. 2. A trip lever for manually actuating a trip device is mounted on a body frame, and the trip lever can be locked at a position further pushed in from a trip position for actuating the trip device. 2. The remote control type circuit breaker according to claim 1, wherein a part of the remote control type circuit breaker is fitted in the ON position or the OFF position at the lock position to lock the operation handle.