JPH0762974B2 - Electric operated circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates mainly to an electrically operated controller of an electrically operated circuit breaker.

[Prior art and its problems]

This type of conventional circuit breaker has a structure in which a drive mechanism of the circuit breaker and an electric actuator are connected by a single operating lever connected to an operating shaft via a one-way clutch. Therefore, when the switch that controls the drive motor (short-time rating) fails, there are drawbacks such as burnout due to long-term operation and damage to the drive mechanism. In addition, the operating point of the limit switch, which turns the electric power of the electric motor on and off after the operation of the driving electric motor, fluctuates due to variations in the rotational force of the driving electric motor, the required operating force of the circuit breaker body, fluctuations in the control circuit voltage, etc.
As a result, in some cases, the motor is burned and the drive mechanism is damaged due to the delayed stop time, and in other cases, the operation is not completed due to the early stop time.Therefore, the timing of the operating point of the limit switch There is also a drawback that adjustment is difficult. Further, in order to eliminate such drawbacks, there is a disadvantage that the time rating of the drive motor is extended and the device for increasing the mechanical strength of the drive mechanism becomes large and uneconomical.

[Object of the Invention]

In view of the above, the object of the present invention is to provide an electrically operated circuit breaker which, in consideration of economy, shortens the time required for adjustment of the control switch and improves reliability, and does not cause burnout of the drive motor or damage to mechanical members. To do.

[Main points of the invention]

In order to achieve the above-mentioned object, the main point of the present invention is to provide a main contactor device composed of a fixed contactor and a movable contactor assembly capable of coming into contact with and separated from the fixed contactor, and a main contactor device connected to the movable contactor assembly and closed when standing up. Operation in which a toggle mechanism that moves the movable contact assembly to the open position when collapsed to the position and a cam that engages with the toggle mechanism to erect from the collapsed state and stores the opened closing spring assembly are fitted. A drive mechanism having a shaft, and an electric actuator having an electric motor for driving the operation shaft in a direction in which the closing spring is stored through a one-way clutch, wherein one end of the electric actuator is swung. An operation lever connected to the drive motor via a drive mechanism, and an operation arm having one end rotatably connected to the other end of the operation lever and the other end connected to the operation shaft via the one-way clutch. By providing a spring that is stretched between the operation lever and the operation arm and urges each other in a direction to restrain the rotation in one direction, the load increases and the rotation time of the closing spring after the energy storage operation is completed is increased. It is intended to prevent the drive motor from being burnt out or the drive mechanism from being damaged by operating only the operation lever for the extension.

Example of Invention

FIGS. 1 to 18 are views showing an embodiment of an electrically operated circuit breaker according to the present invention, and FIGS. 1 to 3 are a plan view, a longitudinal sectional view and a transverse sectional view, and FIG. 6 to 6 show the operating process of the toggle mechanism of the operating device, FIGS. 7 to 9 show the operating process of the drive mechanism, and FIGS. 10 to 18 show the electric operating device and its operating process. Are shown respectively. 1 to 11, the electrically operated circuit breaker includes a main contactor device 30, which is a main component of the case 1 made of an insulating material, and an operating device 40 which controls contact and separation of the main contactor device 30. It is housed and covered with an insulating cover 60 to form a box shape. The main contactor device 30 includes a first fixed contactor 3 mounted on the base 2 of the case 1, a second fixed contactor 4 facing the first fixed contactor 3 with a gap, and a second fixed contactor 4.
The fixed contactor 4 is provided with a fixed contact 6 which is pivotally supported by a pin 5 through a pin 5, and the first fixed contactor 3 has a fixed contact 6 and a contact assembly 7 which can be contacted and separated. The movable contactor assembly 7 is the first
The movable contactor 8 bridging between the second fixed contactors 3 and 4 and the movable contactor 8 are instructed to be swingable and the pin 5
A holder 9 pivotally supported on the second fixed contactor 4 via a crossbar 11, a crossbar 11 connecting the three poles via an insulating holder 10 integrated with the holder 9, and a movable contactor 8 and both fixed Contact springs 12 and 13 for applying a contact pressure to contact portions of the contacts 3 and 4 described later, and an arc contact 14 extended to the movable contact 8.
And a breaking spring 15 interposed between the crossbar 11 and the base 2 to urge the movable contactor assembly 7 in the opening direction. The movable contact 8 is provided with a movable contact 16 facing the fixed contact 6 and separated from the fixed contact 6, and an arc-shaped sliding contact 17 slidingly contacting the second fixed contact 4 as a contact portion. A power supply side terminal 18 is connected to the first fixed contactor 3, an arc extinguishing chamber 19 covering the peripheral portion of the arc contact 14 is connected, and a load side terminal 20 is connected to the second fixed stainer 4. At the same time, the through-type current detection device 21 is inserted.

The operating device 40 includes two side plates 31 and 31 provided on the front side in parallel with the axis of the main contact device 30, and a toggle mechanism 50 and a drive mechanism 100 supported by the side plates 31 and 31.
And an electric actuator 200 coupled to the drive mechanism 100. The toggle mechanism 50 is the crossbar of the main contactor device 38.
One end is connected to 11 and the other end is a side plate
A first toggle link 54 and a pair of first toggle links 54, which are pivotally supported by the shaft 31 via a shaft 51 and are rotatably coupled to each other via pins 52, 53, and a pair of the first toggle links 54. The second toggle link 55, which is a pair of four, sandwiched from both sides.
A pair of toggle levers 56 sandwiched by the other side of the second toggle link 55 are provided as main constituent elements. A receiving plate 57 is integrated with 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 which is an extension of the convex arc surface 58 on its side surface. Is equipped with. The toggle lever 56 is formed in a V shape, and its central portion is pivotally supported by the shaft 51 as described above, one end is connected to the second toggle link 55 through the pin 53, and the other end is a locking claw. A claw pin 61 having a semicircular cross section of a trip mechanism (not shown), which is rotatably supported by the side plate 31 and includes 60, is engageable. The side plate 31 is provided with a stopper 62 at a position facing the claw pin 61 on the other end side of the toggle lever 56, which restricts the counterclockwise rotation of the toggle lever 56, and on the side of the second toggle link 55. Roller stoppers 63 that regulate the bending angle with the first toggle link 54 are fixed in pairs. A tension spring 64 is suspended between the toggle lever 56 and the side plate 31, and is urged counterclockwise about the shaft 51.

The drive mechanism 100 has the above-mentioned toggle mechanism 50 centered on the operation shaft 101 rotatably supported by penetrating the side plate 31.
It is also configured such that most of the members face each other and form a pair with two members. First, the cam 102 is integrated with the inside of the sight plate 31 of the operation shaft 101, and the outside is extended for coupling the manual operation handle 103 and the electric operation device 200 to enable clockwise rotation. A pin 104 is planted on its side surface. A transmission link 105 is rotatably fitted to the operation shaft 101, and a closing spring set 106 is formed between the transmission link 105 and the side plate 31 so as to form pins 107 and 108.
Is suspended through. The closing spring set 106 is a tension spring 109.
And hooks 110 and 111 on both sides. The transmission link 105 is also provided with an oval hole 112, and is connected to a cam follower 114 pivotally supported by the side plate 31 by a shaft 113 via a pin 115. The shaft 113 is arranged so as to have the same coordinates as the connecting pin 53 when the toggle mechanism 50 shown in FIG. 4 stands up. The cam follower 114 is provided with a rotatable roller shaft 116, and the roller shaft 116 is mounted on the outer peripheral surface 102a of the cam 102.
Roll up and rotate the cam 102 in a clockwise direction to the cam follower 114.
It changes to the counterclockwise rotation of. Further cam follower 11
A drive plate 118 is rotatably connected to each of the four members via a pin 117 so as to be sandwiched from both sides, and a drive pin 119 is rotatably supported at the other end of the drive plate 118. The drive pin 119 penetrates through an escape hole 32 provided in the side plate 31 and can engage with the concave and convex surfaces 58 and 59 of the receiving plate 57 of the toggle mechanism 50 located outside the side plate 31. One protrusion 121 of the cam follower 114 is arranged so that the pin 104 of the cam 102 abuts when the rotation of the cam 102 is completed to serve as a stopper, and the local claw portion 122 is provided immediately before the rotation of the cam 102 is completed. It is locked to a pawl shaft 123 having a semicircular cross section. Claw shaft 123
Is rotatably supported by the side plate 31, and the side plate 31 is provided with a stopper 124 for restricting the counterclockwise rotation of the transmission link 105. A separator plate 33 is provided between the main contactor device 30 and the operating device 40 to partition each other.
The separator 33 is provided with an opening 34 through which the toggle ring 50 comes in and out. The side plate 31 is fixed to the separating plate 33, and the separating plate 33 is fixed to the case 1 by screws 35.

The electric actuator 200 is located outside the side plate 31 and is a separator plate 3
3 is installed on the operation shaft 101 emergency means operation handle 10
It is connected to the shaft end located outside of 3. The electric operating device 200 is connected to the operating shaft 101 by an operating lever assembly 210.
And a deceleration mechanism 220 and a drive motor 211 which are coupled to the tip end side of the operation lever assembly 210 and rotate. The operation lever assembly 210 includes a boss 202 fitted on the operation shaft 101 via a one-way clutch 201, and a screw 203 on the boss 202.
And an operation lever 206 having one end (accumulation direction of the closing spring set 106) rotatably connected to the operation arm 204 via the pin 205 and an ellipse 206a extending along the longitudinal direction at the tip. And a tension spring 207 that is stretched between the pin 204a of the operation arm 204 and the pin 206b of the operation lever 206 to urge each other in the rotation restraining direction. The reduction mechanism 220 is the drive motor 21.
While supporting 1 in parallel with the operation shaft 101, a reduction gear 212 described later is rotatably supported, and a side plate 213 fixed to a separating plate 33 in a facing arrangement and a drive motor 21 constituting the reduction mechanism 212.
The pinion 214 integrated with the shaft of 1 and the spur gear 215 that meshes therewith, and the eccentric pin 217 extended to the shaft 216 of the spur gear 215.
And a roller 218 that is rotatably supported by the roller 218 and rolls on the inner edge of the oblong hole 206a of the operation lever 206. Therefore, when the drive motor 211 rotates, the decelerated eccentric pin 217 repeatedly swings the operation lever 206 via the roller 218. The operation lever 206 can be restrained from rotating in the opposite direction by the contact between the arc-shaped stopper 206c protruding from the operation lever 206 and the end surface of the operation arm 204.

The operation in the above configuration is first performed by the drive motor shown in FIG.
When a command to start storing energy is given to 211 and it rotates counterclockwise, the eccentric pin 217 passes through the pinion 214 and spur gear 215 and the shaft 216
Rotate around as a fulcrum. As is apparent from FIG. 12 showing the start position by this rotation, the roller 218 fitted in the eccentric pin 217 rolls along the inner edge of the oblong hole 206a of the operation lever 206, and the tension accompanying this rolling is applied. The operation arm 204 is rotated clockwise by the spring force of the spring 207. And Fig. 12-13
Figure-Figure 14-Operation lever 206 through each process in sequence
Repeats rocking, and the operating arm 204 rocks due to the spring force of the tension spring 207 that accompanies this rocking. As a result, the one-way clutch is attached to the boss 202 integrated with the operation arm 204.
The operation shaft 101 connected via 201 and the cam 102 integrated with the operation shaft 101 rotate clockwise in steps.

As a result, the roller shaft 116 rolls along the cam surface 102a accompanying the clockwise rotation of the cam 102 and the cam follower 114 moves counterclockwise in FIG. Rotate. At this time, the transmission link 105 rotates clockwise about the operation shaft 101 by the coupling pin 115, and the closing spring set 106 coupled to the transmission link 105 is extended to start storing energy. FIG. 8 shows the middle of rotation of the cam 102. Before the apex of the cam surface 102a of the cam 102 reaches the roller shaft 116, the pawl portion 122 of the cam follower 114 is locked to the pawl shaft 123. And the apex of the cam surface 102a is the roller shaft 116.
After passing through, the pin 104 comes into contact with the projection 121 as shown in FIG. 9, and the operation shaft 101 cannot rotate, that is, cannot be rotated by the drive motor 211, and at the same time, the energy accumulation of the closing spring set 106 is completed. At this time, the operating arm 204 is stopped at the position shown in FIG. 16, but the operating lever 206 continues to rotate due to inertia even after the drive motor 211 is disconnected from the power source, and while extending the tension spring 207, FIG. 17-FIG. The rotation is continued as shown in the figure and the same operation is repeated. When the inertia of the drive motor 211 disappears, the operation is stopped.

The contact / separation of the main contactor device 30 accompanying the operation of the toggle mechanism 50 is performed as follows. First, when the main contactor device 30 in FIG. 6 is in the separated state and the operating device 40 is in the stored state, the drive pin 119 is engaged with the concave arc surface 59 of the receiving plate 57 and its movement is restricted. As shown in FIG. 9, when the pawl shaft 123 is rotated clockwise, the pawl portion 122 is disengaged and the cam follower 114 is rotated clockwise by the closing spring set 106. As a result, the second toggle link 55 rotates clockwise around the pin 53, the movable contact 8 comes into contact with the first fixed contact 3, and thereafter, as shown in FIG. 4 and FIG. The toggle link 55 comes into contact with the roller stopper 63 and stops, and the toggle mechanism 50 is in an upright state, pressing the movable contactor assembly 7 to close the fixed contactor 3, and at the same time, the transmission link 105 comes into contact with the stopper 124. The closing or closing operation of the main contactor device 30 is completed. At this time, the claw portion 60 of the toggle lever 56 is locked to the claw pin 61, and is urged clockwise by the spring force of the contact spring 12 and the blocking spring 15.

Next, in the disconnection operation, the toggle lever 56 is rotated clockwise by rotating the claw pin 61 clockwise, and the second toggle link 55 is
Passes through between the drive pin 119 and the roller stopper 63 and moves upward to break the connecting portion between the first toggle link 54 and the second toggle link 55, that is, the toggle mechanism 50 collapses and the main contact device 30 opens. Fig. 5 shows the opening process, and the toggle lever 56 is released at the same time when the opening is completed.
Is rotated counterclockwise by the tension spring 64, and the claw portion 60 is again locked to the claw pin 61. When the lid is closed, the operating shaft 101 is rotated clockwise by the electric operating device 200 as described above, and the closing spring set 106 is in a stored state, that is, the operating shaft 101 is rotated, as shown in FIG. Cam 102, roller shaft 1
16, drive pin 119 via cam follower 114 and drive plate 118
It suffices to engage the concave arc surface 59 by sliding on the convex arc surface 58 of the receiving plate 57. When the electric actuator 200 is rotated from the state in which the closing is completed (FIG. 4), the closing spring set 106 can be charged while maintaining the standing state of the toggle mechanism 50, that is, the closing of the main contactor device 30. Becomes Therefore, when the pawl pin 61 is rotated clockwise from the above-mentioned state, the toggle mechanism 50 shifts to the disconnecting operation, and the pawl shaft 123 can be closed again by rotating the pawl shaft 123 immediately after the disconnection. That is, each of the shut-off-make-shut-off operations can be performed immediately without any energy storage operation.

According to this embodiment with the above-mentioned configuration, the closing spring assembly 106
The operation shaft 101 is not directly rotated by the rotational force of the drive motor 211 to store the energy, but a tension spring 207 that repeats energy storage-release by the rotational force is interposed between the operation shaft 101 and the operation shaft 101 by the spring force. 101
By rotating the motor, it is possible to continue rotating without stopping the motor if the control switch of the drive motor 211 fails or the motor continues to rotate due to the inertial torque of the motor after the energy storage is completed. Burnout accidents are prevented, and it is sufficient to adjust the position of the limit switch for stopping the drive motor 211 mainly due to the variation in the required rotational force of the main unit, and this does not lead to the time rating up of the drive motor. . Therefore, it is not necessary to increase the strength of the inertial absorption device and mechanical members, and it can be applied to small circuit breakers.
It is not necessary to adjust the operating point of the control switch.

〔The invention's effect〕

According to the present invention, the electric operating device for accumulating the closing spring has an operation lever whose one end is connected to the drive motor through the swing drive mechanism, and one end of which can be rotated to the other end of the operation lever. And an operating arm having the other end coupled to the operating shaft via the one-way clutch, and a spring stretched between the operating lever and the operating arm to urge each other in a direction to restrain rotation in one direction. By providing and, it is possible to prevent burnout of the drive motor and damage to the drive mechanism by operating only the operation lever in response to an increase in load and extension of the rotation time after the completion of the energizing operation of the closing spring. As a result, it is possible to provide an electrically operated circuit breaker that is easy to adjust and has significantly improved reliability.

[Brief description of drawings]

1 to 18 show an embodiment of an electrically operated circuit breaker according to the present invention. FIG. 1 is a plan view with a cover removed, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a transverse sectional view. 4 to 6 are side views showing the operation process of the toggle mechanism 50, FIG.
FIGS. 9 to 11 are side views showing the operation process of the drive mechanism 100, FIGS. 10 and 11 are plan and side views of the electric actuator 200, and FIGS. 12 to 18 are operations of the electric actuator 200. It is a principal part side view which shows a process. 3,4 ...... Fixed contactor, 7 ...... Movable contactor assembly, 30 ...... Main contactor device, 31 ...... Side plate, 50 ...... Toggle mechanism, 100 ...... Drive mechanism, 101 ...... Operation axis, 102 …… Cam, 1
06 …… closing spring assembly, 200 …… electric actuator, 201 …… one-way clutch, 204 …… operating arm, 206 …… operating lever, 20
6a …… Oval hole, 207 …… Tension spring, 211 …… Drive motor,
212 …… Reduction mechanism, 217 …… Eccentric pin, 218 …… Roller.

Claims (1)

[Claims] 1. A main contactor device comprising a fixed contactor and a movable contactor assembly capable of contacting and separating from the fixed contactor, and a movable contactor assembly connected to the movable contactor assembly at a closed position when standing up and at an open position when collapsed. A toggle mechanism for moving the movable contact assembly, a drive mechanism having an operation shaft fitted with a cam for engaging the toggle mechanism to erect from a collapsed state and store the opened closing spring set, and the operation described above. An electric actuator having a drive electric motor for driving a shaft in a power storing direction of the closing spring via a one-way clutch, wherein the electric actuator has one end connected to the drive electric motor via a swing drive mechanism. Between the operating lever and the operating lever, one end of which is rotatably coupled to the other end of the operating lever and the other end of which is coupled to the operating shaft via the one-way clutch. Frames are electric-operated circuit breaker is characterized by providing a spring for urging in a direction to restrain the rotation of one direction to each other.