JPH0334176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates primarily to an electric operating device for an electrically operated circuit breaker.

[Prior art and its problems]

Conventional circuit breakers of this type have a structure in which the drive mechanism of the circuit breaker and the electric operating device are connected by one operating lever connected to an operating shaft via a one-way clutch. For this reason, if the switch that controls the drive motor (short-time rating) breaks down, it may burn out due to long-term operation or damage the drive mechanism. In addition, when adjusting the operating point of the limit switch after the operation of the drive motor is completed, it is necessary to allow as much margin as possible, since variations in the required operating force of the rotational force of the drive motor, fluctuations in the control circuit voltage, etc. overlap. As a result, in some cases, motor burnout and drive mechanism damage may occur due to delayed stopping timing.
In other cases, it has been difficult to adjust the timing of the operating point of the control switch, such as incomplete operation due to premature stoppage. Furthermore, because of the large amount of space it occupies, it has had many drawbacks, such as uneconomical measures such as extending the time rating of the drive motor or increasing the strength of the members of the drive mechanism.

[Purpose of the invention]

In view of the above, the purpose of this invention is to provide an electrically operated circuit breaker that reduces the time required for adjustment of control switches and improves reliability, with economic efficiency in mind, and that reduces damage such as burnout or damage that requires replacement of parts. Our goal is to provide the following.

[Key points of the invention]

The gist of this invention is to achieve the above-mentioned object by providing a main contact device consisting of a fixed contact and a movable contact assembly that can be brought into and out of contact with the fixed contact, and a side plates disposed side by side, one end of which is pivotally supported by the side plate and the other end connected to the movable contact assembly, the movable contact assembly being in a closed position when standing up and in an open position when collapsing; a drive mechanism having an operating shaft pivotally supported on the side plate and fitted with a cam that engages the torge mechanism to raise the torgue mechanism from a collapsed state and stores energy in the released closing spring set; a first operating lever coupled to the operating shaft via a one-way clutch; and a second operating lever pivotally supported on the outside of the shaft, swingably coupled to the first operating lever, and having an elongated hole along the longitudinal direction at its tip. an operating lever, a spring stretched between the first and second operating levers to bias them in opposite directions, and a speed reduction mechanism for a drive motor that is rotatably fitted into the elongated hole of the second operating lever. and an electric actuator consisting of a roller that is rotated by an eccentric pin connected to the actuator, so that only the second operating lever is operated in response to an increase in the load and a prolongation of the rotation time after the energy storage operation is completed. This prevents burnout of the drive motor and damage to the drive mechanism.

[Embodiments of the invention]

1 to 18 are diagrams showing one embodiment of an electrically operated circuit breaker according to the present invention. 6 to 6 show the operation process of the torge mechanism of the operating device, FIGS. 7 to 9 show the operation process of the drive mechanism, and FIGS. 10 to 1.
Figure 8 shows the electric actuator and its operating process. 1 to 9, the electrically operated circuit breaker has a main contact device 30, which is its main component, and an operating device 40, which controls the connection and disconnection of the main contact device 30, in a case 1 made of an insulating material. is housed therein and covered with an insulating cover 60 to form a box shape. The main contact device 30 is case 1
A first fixed contact 3 mounted on a base 2 and a second fixed contact 4 facing the first fixed contact 3 with a distance therebetween, and a pin 5 connected to the tip of the second fixed contact 4. The first fixed contact 3 includes a fixed contact 6 provided at the tip thereof and a movable contact assembly 7 that can be brought into contact with and separated from the first fixed contact 3. The movable contact assembly 7 includes a movable contact 8 that bridges between the first and second fixed contacts 3 and 4, and a movable contact 8 that supports the movable contact 8 in a swingable manner and connects the movable contact 8 via the aforementioned pin 5. A holder 9 pivotally supported on the fixed contact 4 of No. 2, and an insulating holder 1 integrated with the holder 9.
Crossbar 11 that connects the three poles via 0
and a contact spring 12 that applies contact pressure to the contact portions of the movable contact 8 and both fixed contacts 3 and 4, which will be described later.
13 and an arc contact 14 extending to the movable contact 8
and a cutoff spring 15 which is inserted between the crossbar 11 and the base 2 and urges the movable contact assembly 7 in the direction of separation. The movable contact 8 is provided with, as contact portions, a movable contact 16 that faces the fixed contact 6 and moves toward and away from it, and a sliding contact 17 formed in an arc shape that slides into contact with the second fixed contact 4 . Note that a power supply side terminal 18 is connected to the first fixed contact 3, and an arc extinguishing chamber 19 that covers the periphery of the arc contact 14 is connected to the first fixed contact 3.
However, the second fixed contact 4 also has a load side terminal 20.
is connected to the through-type overcurrent detection device 2.
1 is inserted.

The operating device 40 includes a side plate 31 arranged parallel to the axis of the main contact device 30 on the front side.
, a toggle mechanism 50 and a drive mechanism 100 supported by a side plate 31, and an electric operating device 200 coupled to the drive mechanism 100. The toggle mechanism 50 has one end connected to the crossbar 11 of the main contact device 30, and the other end pivotally supported to the side plate 31 via a shaft 51, and are rotatably connected to each other via pins 52 and 53. was done 2
A pair of first toggle links 54 and four second toggle links 5 sandwiching each first toggle link 54 from both sides.
5 and the other side of the second toggle link 55.
The main component is a pair of toggle levers 56. A receiving plate 57 is integrated into each of the two opposing inner sides of the second toggle link 55, and the receiving plate 57 has a convex arc surface 58 and a concave arc surface 59 that is an extension of the convex arc surface 58 on its side surface. It is equipped with The toggle lever 56 is formed in an F-shape, and its central portion is pivotally supported by the shaft 51 as described above, and one end is connected to the second toggle link 55 with the pin 5.
3, a claw pin 6 having a semicircular cross section and having a locking claw 60 at the other end and rotatably supported on the side plate 31, not shown.
1 and can be engaged with each other. The side plate 31 has a claw pin 6 on the other end of the toggle lever 56.
A stopper 62 that restricts the counterclockwise rotation of the toggle lever 56 is located at a position opposite to the first toggle link 55, and a stopper 62 that restricts the counterclockwise rotation of the toggle lever 56 is located opposite to the first toggle link 55.
Roller stoppers 63 for regulating the bending angle with 4 are fixed in pairs, respectively. A tension spring 64 is also suspended between the toggle lever 56 and the side plate 31, and is biased counterclockwise about the shaft 51.

The drive mechanism 100 is opposed to the above-mentioned toggle mechanism 50 with an operating shaft 101 rotatably supported through the side plate 31 as the center, so that most of its members form a pair. It is configured. First, a cam 102 is attached to the inner side of the side plate of the operation shaft 101, and one of the outer sides is extended to connect the manual operation handle 103 and the electric actuator 200, allowing for clockwise rotation. A pin 104 is implanted therein. A transmission link 105 is rotatably fitted to the operation shaft 101, and a closing spring set 106 is connected to the transmission link 105 and the side plate 31 with a pin 107,
It is suspended via 108. Closing spring set 10
6 is a tension spring 109 and hooks 110, 1 on both sides.
It consists of 11. The transmission link 105 is also provided with an oblong hole 112 and is coupled via a pin 115 to a cam follower 114 which is pivotally supported on the side plate by a shaft 113. Note that the shaft 113 is arranged so as to have the same coordinates as the coupling pin 53 when the toggle mechanism 50 shown in FIG. 4 is erected. The cam follower 114 is provided with a rotatable roller shaft 116, and the roller shaft 116 is connected to the cam 10.
The rotation of the cam 102 in the clockwise direction is changed into the rotation of the cam follower 114 in the counterclockwise direction. Furthermore, a drive plate 118 is rotatably connected to each of the cam followers 114 via a pin 117 so as to sandwich it from both sides, and a drive pin 119 is rotatably supported at the other end of the drive plate 118. The drive pin 119 passes through an escape hole 32 provided in the side plate 31 and can engage with both concave and convex arcuate surfaces 58 and 59 of a receiving plate 57 of the toggle mechanism 50 located outside the side plate 31. The drive plate 118 is always biased counterclockwise with respect to the coupling pin 117 by a tension spring 120. One protrusion 121 of the cam follower 114 is arranged so that when the rotation of the cam 102 is completed, the pin 104 provided on the cam 102 comes into contact with it and serves as a stopper, and the other claw portion 122 is arranged so that the pin 104 provided on the cam 102 comes into contact with the protrusion 121 when the rotation of the cam 102 is completed. Claw shaft 12 with semicircular cross section
It is locked at 3. The claw shaft 123 is attached to the side plate 3
The side plate 3 is rotatably supported on the side plate 1.
1 is provided with a stopper 124 that restricts rotation of the transmission link 105 in the counterclockwise direction. A separating plate 33 is provided between the main contact device 30 and the operating device 40 to separate them from each other, and the separating plate 33 is provided with an opening 34 through which the toggle mechanism 50 enters and exits. The side plate 31 is fixed to a separator 33, and the separator 33 is fixed to the case 1 with screws 35.

The electric operating device 200 is installed on the separator 33 on the outside of the side plate 31 and is coupled to the shaft end of the operating shaft 101 located on the outside of the emergency manual operating handle 103 . And electric actuator 200
is the operating lever assembly 2 coupled to the operating shaft 101 side.
10, a deceleration mechanism 220 that is coupled to the distal end side of the operating lever assembly 210 and rotates, and a drive motor 211. Operation lever assembly 21
0 is a first operating lever 202 fitted into the operating shaft 101 via a one-way clutch 201;
The first operating lever 2 is rotatably supported on an operating shaft 101 located outside the first operating lever 202.
02 and a second operating lever 2 swingably connected to the second operating lever 2.
03, and a deceleration mechanism 220 provided along the longitudinal direction at the tip of the second operating lever 203.
It is stretched between a long hole 203a that can be engaged with and three pins 204, 205 planted on the opposite edges of the first and second operating levers 202, 203. It is provided with three tension springs 206 that bias springs 202 and 203 in opposite directions. The deceleration mechanism 220 supports a drive motor 211 parallel to the operating shaft, rotatably supports a deceleration gear 212, which will be described later, and is arranged opposite to the separator 3.
3, a pinion 214 integrated with the shaft of the drive motor 211 constituting the reduction mechanism 212, and a spur gear 215 that meshes with the pinion 214.
The elongated hole 2 of the second operating lever 203 of the operating lever assembly 210 is rotatably supported by an eccentric pin 217 extending from the shaft 216 of the spur gear 215.
03a and a roller 218 that rolls on the inner edge of the roller 218. Therefore, when the drive motor 211 rotates, the decelerated eccentric pin 217 swings the second operating lever 203 via the roller 218. Note that the first operating lever 202 of the operating lever assembly 210 is provided with a stopper 219 that collides with the edge of the second operating lever 203 to prevent excessive movement due to the spring force of the tension spring 206.

The operation in the above configuration is as follows: First, a command is given to the drive motor 211 in FIG. 11 to start storing energy, and when it rotates counterclockwise, the pinion 214 and the spur gear
15, the eccentric pin 217 rotates about the shaft 216 as a fulcrum. This rotation indicates the starting position.
As is clear from FIG. 2, the roller 218 fitted into the eccentric pin 217 rolls along the inner edge of the elongated hole 203a of the second operating lever 203, and as the roller 218 rolls, the spring force of the tension spring 206 increases. The first operating lever 202 rotates clockwise. and the first
Fig. 2 - Fig. 1 - Fig. 14 - After going through each process in sequence, the second operating lever 203 repeatedly swings,
The spring force of the tension spring 206 accompanying this swing causes the first operating lever 202 to swing. As a result, the operating shaft 101 connected to the first operating lever 202 via the one-way clutch 201 and the cam 102 integrated therewith are rotated clockwise in stages. As a result, the closing spring set 106
In FIG. 7, which shows the start of energy storage, as the cam 102 rotates clockwise, the roller shaft 116 rolls along the cam surface 102a, rotating the cam follower 114 counterclockwise. At this time, the transmission link 105 is rotated clockwise about the operating shaft 101 by the coupling pin 115, and the closing spring set 106 coupled to the transmission link 105 is stretched to begin storing energy.
FIG. 8 shows the cam 102 in the middle of rotation, and before the apex of the cam surface 102a of the cam 102 reaches the roller shaft 116, the claw portion 122 of the cam follower 114 is locked to the claw shaft 123. After the apex of the cam surface 102a passes the roller shaft 116, the pin 104 moves to the protrusion 1 as shown in FIG.
21 and the operation shaft 101 rotates, that is, rotation by the drive motor 211 becomes impossible, and at the same time, the energy storage of the closing spring set 106 is completed. At this time, the first operating lever 202 stops at the position shown in FIG. 16, but the second operating lever 203 continues to rotate due to inertia even after the drive motor 211 is disconnected from the power source, and stretches the tension spring 206. 17 to 18, the same operation is repeated, and when the drive motor loses inertia, it stops.

The main contact device 30 is brought into contact with and separated from the main contact device 30 in the following manner as the toggle mechanism 50 operates. First, when the main contactor device 30 is in the open state and the operating device 40 is in the energized state in FIG. , as shown in FIG.
When rotated clockwise, the claw portion 122 comes off and the cam follower 114 is rotated clockwise by the closing spring set 106. As a result, the second toggle link 55 rotates clockwise about the pin 53, and the movable contact 8 contacts the first fixed contact 3.
Thereafter, as shown in FIGS. 4 and 7, the second toggle link 55 comes into contact with the roller stopper 63, that is, the toggle mechanism 50 becomes in the upright state, and at the same time, the transmission ring 105 comes into contact with the stopper 124, and the main contact device 30 The closing or closing operation is complete. At this time, the toggle lever 56 has its claw portion 60 locked with the claw pin 61 and is biased clockwise by the spring force of the contact spring 12 and the cutoff spring 15. Next, in the blocking operation, the toggle lever 56 rotates clockwise as the pawl pin 61 rotates clockwise, and the second toggle link 55 connects the drive pin 11.
9 and the roller stopper 63 and move upward, the first toggle link 54 and the second toggle link 55 and their joints break, that is, the toggle mechanism 50 collapses, and the main contactor device 30 opens. . FIG. 5 shows the opening process, and at the same time as the opening is completed, the toggle lever 56 is rotated counterclockwise by the tension spring 64, and the claw portion 60 is locked with the claw pin 61 again. . For subsequent re-insertion, the electric actuator 200 operates the operation shaft 101 as described above.
is rotated clockwise to set the closing spring set 106 in the energized state as shown in FIG. 119 and the convex arc surface 58 of the receiving plate 57 to engage the concave arc surface 59. When the electric actuator 200 is rotated from the state where the closing is completed (FIG. 4), the closing spring assembly 10 is maintained while the toggle mechanism 50 is in the upright state, that is, the main contactor device 30 is maintained closed.
It becomes possible to store 6. Therefore, when the pawl pin 61 is rotated clockwise from the above-mentioned state, the toggle mechanism 50 shifts to the shutoff operation, and immediately after shutoff, the toggle mechanism 50 can be turned on again by rotating the pawl shaft 123 clockwise. That is, each operation of shutting off, turning on, and shutting off can be performed immediately without requiring an energy storage operation in between.

In the above configuration, this embodiment has the closing spring set 1.
06 does not directly rotate the operating shaft 101 with the rotational force of the drive motor 211, but a tension spring 206 that repeatedly stores and releases energy with the rotational force is interposed between them, and the spring force rotates the operating shaft. By rotating the motor 101, the drive motor 2 is activated after the energy storage is completed.
Even if the control switch 11 fails or the motor continues to rotate due to inertial rotational force, burnout of the drive motor 211 can be prevented, and the limit switch for stopping the drive motor 211, which is mainly caused by variations in the required rotational force of the main unit, can be prevented. It is only necessary to allow some leeway in position adjustment, and this does not lead to an increase in the time rating of the drive motor. Therefore, there is no need to increase the strength of the inertial absorption device or mechanical members, making it possible to apply it to small circuit breakers, and eliminating the need to adjust the operating point of the control switch.

〔Effect of the invention〕

According to this invention, a spring mechanism is interposed between the operating shaft for charging spring energy and the electric actuator, which rotates the operating shaft by repeatedly storing and releasing energy, making adjustment easy. Therefore, it is possible to provide an electrically operated circuit breaker with significantly improved reliability.

[Brief explanation of drawings]

1 to 18 show an embodiment of the electrically operated circuit breaker according to the present invention, in which FIG. 1 is a plan view with the cover removed, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a horizontal sectional view. , Figures 4 to 6 show the toggle mechanism 5.
FIGS. 7 to 9 are side views showing the operation process of the drive mechanism 100, and FIGS.
0 and 11 are a plan view and a side view of the electric operating device 200, and FIGS. 12 to 18 are side views of essential parts showing the operation process of the electric operating device 200. 3, 4... Fixed contact, 7... Movable contact assembly, 3
0... Main contact device, 31... Side plate, 50
... Toggle mechanism, 100 ... Drive mechanism, 101 ... Operation shaft, 102 ... Cam, 200 ... Electric operation device, 201
... One-way clutch, 202, 203 ... Operation lever, 203a ... Long hole, 206 ... Tension spring, 21
DESCRIPTION OF SYMBOLS 1... Drive electric motor, 212... Reduction mechanism, 217... Eccentric pin, 218... Roller.

Claims (1)

[Claims] 1. A main contact device consisting of a fixed contact and a movable contact assembly that can be moved into and out of contact with the fixed contact, a side plate arranged in parallel on the front side parallel to the axis of the main contact device, and one end of the main contact device. is pivotally supported and the other end is connected to the movable contact assembly, and a toggle mechanism that moves the movable contact assembly to a closed position when standing up and to an open position when collapsed; A cam is fitted to store the closing spring set which is raised up from the collapsed state and released, and is connected to a drive mechanism having an operating shaft pivotally supported by the side plate, and to the operating shaft via a one-way clutch. a first operating lever, a second operating lever that is pivotally supported on the outside of the shaft, is swingably coupled to the first operating lever, and has a long hole extending in the longitudinal direction at its tip; both the first and second operating levers; A spring that is stretched between the levers and biases them in opposite directions, and a roller that is rotatably fitted into the elongated hole of the second operating lever and rotated by an eccentric pin connected to the speed reduction mechanism of the drive motor. An electrically operated circuit breaker comprising: an electrically operated operating device comprising: