JPS6293814A - Motor operated circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

[Prior art and its problems] This type of conventional circuit breaker has a structure in which the circuit breaker drive mechanism and the electric actuator are connected by one operating lever connected to the operating shaft via a one-way clutch. It had become. Therefore, if 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 IJ switch, which cuts off the power to the motor after the operation of the drive motor is completed, varies due to the rotational force of the drive motor, variations in the required operating force of the circuit breaker body, fluctuations in the control circuit voltage, etc. In this case, the electric motor may burn out and the drive mechanism may be damaged due to the late stop time, and in other cases, the operation may not be completed due to the early stop time. It also has the disadvantage that it is difficult to train the timing. Furthermore, if the time rating of the drive motor is increased or the mechanical strength of the drive mechanism is increased in order to eliminate these drawbacks, the device becomes large and uneconomical.

[Purpose of the invention]

In view of the above, an object of the present invention is to provide an electrically operated circuit breaker which reduces the time required for adjusting the control switch and improves reliability, and which does not cause burnout of the drive motor or damage to mechanical members, taking economic efficiency into consideration. 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 main contact device that is connected to the movable contact assembly and that is closed when standing up. A toggle mechanism that moves the movable contact assembly to the open position when the movable contact assembly collapses into the collapsed position, and a cam that engages the toggle mechanism to raise the movable contact assembly from the collapsed state and store energy in the released closing spring assembly. a drive mechanism having a shaft; an operating arm coupled to the operating shaft via a one-way clutch; an operating lever rotatably coupled to the operating arm; It is equipped with an electric actuator consisting of a spring that biases in a direction that restricts rotation in the direction and a drive motor that swings the tip of the operating lever, and is effective in increasing the load and prolonging the rotation time after the energy storage operation is completed. In contrast, only the control lever is operated to prevent 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. or 6th
The figure shows the operation process of the toggle mechanism of the operating device, the operation process of the drive mechanism is shown in Figures 7 to 9, and the operation process of the drive mechanism is shown in Figure 10.
The electric actuator and its operating process are shown in the figures through FIG. 18, respectively. In FIGS. 1 to 11, 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 king contact #30, in a case 1 made of an insulating material. is housed therein, and is formed into a box shape, covered with a cover 60 made of an insulating material. The king contact device @30 includes a first fixed contact 3 mounted on the base 2 of the case L, a second fixed contact 4 facing the first fixed contact 3 with a space therebetween, and the second fixed contact 4 mounted on the base 2 of the case L. The first fixed contact 3 is pivotally supported at the tip via a pin 5, and includes a movable contact assembly 7 that can be brought into and out of contact with a fixed contact 6 provided at the tip. The movable contact assembly 7 is the first. A movable contact 8 bridges between the second fixed contacts 3 and 4, and a movable contact 8 that swingably supports the movable contact 8 and is pivoted to the second fixed contact 4 via the aforementioned pin 5. Contact pressure is applied to the holder 9, the crossbar 11 that connects the three poles via the insulating holder 10 integrated with the holder 9, and the contact portions of the movable contact 8 and double-sided constant contacts 3 and 4, which will be described later. contact springs 12 and 13 to provide;
It includes an arc contact 14 extending to the movable contact 8, and a cutoff spring 15 inserted between the cross spar 11 and the base 2 and biasing the movable contact assembly 7 in the opening direction. 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 that has 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 peripheral part of the arc contact 14 is connected, and a load side terminal 20 is connected to the second fixed contact 4. At the same time, a penetrating current detection device 21 is inserted therein.

Control device! Reference numeral 140 denotes two side plates 31.31 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 the side plate 1-31.31, The drive mechanism 100 is configured with an electric operating device 200 coupled to a 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 pivoted to the side plate 31 via a shaft 51, and are rotatably connected to each other via pins 52 and 53. The two first toggle links 54 that form a pair
, second toggle links 55 that form a pair of four pieces so as to sandwich each first toggle link 54 from both sides, and toggle levers 56 that form a pair of two pieces that are sandwiched on the other side of the second toggle links 55. It has as a main component.

A receiving plate 57 is integrated into each of the two opposing inner sides of the second torque 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 the center portion thereof is pivotally supported by the shaft 51 as described above.
A tripping mechanism (not shown) has a semicircular cross section, which is connected to the second toggle link 55 via a pin 53 at one end, has a locking claw 60 at the other end, and is rotatably supported on the side plate 31. It is possible to engage with the claw pin 61 of. A stopper 62 for restricting the counterclockwise rotation of the toggle lever 56 is provided on the side plate 31 at a position facing the claw pin 61 on the other end side of the toggle lever 56, and a stopper 62 is provided 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 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 aforementioned toggle mechanism 50 around an operating shaft 101 rotatably supported through a side plate 31, so that most of its members form a pair. It consists of: First, operation axis 1
A cam 102 is integrated inside the side plate 31 of 01, and a manual operation handle 103 and an electric operation device 2 are installed on the outside.
The cam 102 is extended to connect the cam 102 and rotate clockwise, and a pin 104 is installed on the side of the cam 102. A transmission link 105 is rotatably fitted to the operation shaft 101, and a side plate 31 is fitted to the transmission link 105.
A closing spring set 106 is suspended between the two via pins 107 and 108. 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 oblong hole 112, and is connected via a pin 115 to a cam follower 114 which is pivotally supported on the side plate 31 by a shaft 113.The shaft 113 is a toggle mechanism shown in FIG. The connecting pin 53 is arranged at the same coordinates as the connecting pin 53 when the connecting pin 50 is erected. The cam follower 114 is provided with a rotatable roller shaft 116,
The roller shaft 116 rolls on the outer circumferential surface 102a of the cam 102, changing the clockwise rotation of the cam 102 to the counterclockwise rotation of the cam follower 114. Furthermore, the cam follower 11
A drive plate 118 is rotatably coupled to each of the drive plates 11 and 4 via pins 117 so as to sandwich the drive plate 118 from both sides.
A drive pin 119 is rotatably supported at the other end of the drive pin 8 . The drive pin 119 passes through the escape hole 32 provided in the side plate 31 and connects to both uneven arcuate surfaces 58 and 59 of the receiving plate 57 of the toggle mechanism 50 located outside the side plate 31.
can be engaged with. One protrusion 121 of the cam follower 114 rotates the cam 102 when the rotation of the cam 102 is completed.
The other claw portion 122 is engaged with a claw shaft 123 having a semicircular cross section just before the rotation of the cam 102 is completed. Claw shaft 12
3 is rotatably supported by a side plate 31, and the side plate 31 is provided with a stopper 124 for restricting rotation of the transmission link 105 in the counterclockwise direction. A separating plate 33 is provided between the positive 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 ring 50 enters and exits.

The side plate 31 is fixed to the 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 . The electric operating device 200 includes an operating lever assembly 210 coupled to the operating shaft 101, a reducer 5220 coupled to the distal end of the operating lever assembly 210, and a drive motor 211 for rotational operation. Lever assembly 210
A boss 202 is connected to the operating shaft 101 via a one-way clutch 201, an operating arm 204 is fixed to the boss 202 with a screw 203, and a pin 205 is attached to the operating shaft 104.
The operating lever 206 is coupled to be rotatable in one direction (the direction of accumulating the force of the closing spring set 106) through the operating lever 206 and has an elongated round hole 206a along the longitudinal direction at the tip thereof, and a pin 204 of the operating arm 204.
a and a pin 206b of the operating lever 206, and a tension spring 207 that biases each other in the rotation restraining direction. The speed reduction mechanism 220 connects the drive motor 211 to the operation shaft 10.
1, a side plate 213 that rotatably supports a reduction gear 212 (described later), and is fixed to a separation plate 33 in an opposing arrangement; and a drive motor 2 that constitutes a reduction gear mechanism 212.
It is rotatably supported by a pinion 214 integrated with the shaft of 11, a spur gear 215 meshing with the pinion 214, and an eccentric pin 217 extending from the shaft 216 of the spur gear 215. Roller 218 rolling on the inner edge
Therefore, when the drive motor 211 rotates, the decelerated eccentric pin 217 repeatedly swings the operating lever 206 via the roller 218. Note that rotation of the operating lever 206 in the opposite direction is restricted by abutment between an arcuate stopper 206c protruding from the operating lever 206 and an end surface of the operating arm 204.

The operation of the above configuration is as follows: First, a command to start accumulating energy is applied to the drive motor 211 shown in FIG. As a result of this rotation, the roller 218 that is fitted into the eccentric pin 217, which indicates the starting position, moves to the operating lever 2.
The operating arm 204 rotates along the inner edge of the long round hole 206a of 06, and the spring force of the tension spring 207 accompanying this rotation causes the operating arm 204 to
rotates clockwise. And the 12th "-Figure 13-"
Figure 14 - After each process is completed, the operating lever 206
The tension spring 207 repeats the oscillation, and as a result of this oscillation, the tension spring 207
The operating arm 204 swings due to the spring force. As a result, the operating shaft 701 connected to the boss 202 integrated with the operating arm 204 via the one-way clutch 201 and the cam 102 integrated therewith rotate stepwise clockwise. FIG. 7, which shows the start of energy storage, shows the cam surface 102 as the cam 102 rotates clockwise.
The roller shaft 116 rolls along the cam follower 114.
Rotate in the counterclockwise direction.

At this time, the transmission link 105 is rotated clockwise about the operation@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. cam surface 1
After the apex of 02a passes the roller shaft 116, the pin 104 comes into contact with the protrusion 121 as shown in the ninth factor, and the operation shaft 101
At the same time that rotation by V, the movement motor 211 becomes impossible, the energy storage of the closing spring set 106 is completed.

At this time, the operating arm 204 stops at the position shown in FIG.
The operating lever 206 continues to rotate due to inertia even after the drive motor 211 is disconnected from the power source, and the tension spring 207
The motor 211 continues to rotate and repeat the same operation as shown in FIGS. 17 to 18 while stretching the motor 211, and stops when the drive motor 211 loses its inertia.

The connection and separation of the main contactor device 30 with the operation of the toggle mechanism 50 is performed as follows) First, the main contactor device 30 in FIG. 6 is in the open state and the operating device 40 is in the energized state. At this time, the drive pin 119 engages with the concave arc surface 59 of the receiving plate 57 and is restrained from moving. When the claw shaft 123 is rotated clockwise as shown in FIG. 114 is rotated clockwise by the closing spring set 106. As a result, the second toggle link 55
rotates clockwise around the pin 53, and the movable contact 8 comes into contact with the first fixed contact 3, and then as shown in FIGS.
(As shown in this figure, the second toggle link 55 comes into contact with the roller stopper 63 and stops, and the toggle mechanism 50 goes into an upright state, presses the movable contact assembly 7 to close it to the fixed contact 3, and simultaneously transmits The link 105 contacts the stopper 124 to complete the closing or closing operation of the main contactor device 30. At this time, the claw portion 60 of the toggle lever 56 is locked to the claw pin 61, and the contact spring 12 and the cutoff Q is biased clockwise by the spring force of the spring 15 Next, in the blocking operation, the toggle lever 56 is rotated clockwise by rotating the pawl pin 61 clockwise, and the second toggle link 55 is pressed against the drive pin 119. and the roller stopper 63 and move upward, and the joint between the first toggle link 54 and the second toggle link 55 breaks, that is, the toggle mechanism 50 collapses and the main contactor device 30 opens. FIG. 5 shows the opening process. 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 to the claw pin 61 again. Ru.

For subsequent re-closing, the electric actuator 200 is used to rotate the operating shaft 101 clockwise as described above to place the closing spring set 106 in the energized state, that is, the operating shaft 1
The cam 102.01 rotates. Roller shaft 116. Drive pin 1 via cam follower 114 and drive plate 118
19 and the concave arc surface 59 of the receiving plate 57 by sliding on the convex arc surface 58. When the electric actuator 200 is rotated from the state where the closing is completed (FIG. 4), the closing spring set 106 can be charged while maintaining the upright state of the toggle mechanism 50, that is, the closed state of the royal contact terminal @30. It becomes possible. Therefore, when the claw pin 61 is rotated clockwise from the above-mentioned state, the toggle mechanism 50 shifts to the cut-off operation, and immediately after the cut-off, the claw shaft 1
23 clockwise, it can be thrown in again. In other words, each of the shutoff-on-shutdown operations can be performed immediately without requiring a power storage operation in between.

In the above configuration, according to this embodiment, the closing spring set 10
The rotational force of the drive electric motor 211 directly connects the operating shaft 1 to the stored energy of the drive motor 211.
Instead of rotating 01, the rotational force is used to store energy during that time.
By interposing a tension spring 207 that repeatedly releases energy and rotating the operating shaft 101 with the spring force, it is possible to prevent the control switch of the drive motor 211 from malfunctioning or to continue rotating due to the inertial rotational force of the motor after energy storage is completed. In this case, the motor can continue to rotate without being stopped, and the drive motor 21
The burnout accident described in No. 1 can be prevented, and the adjustment of the position of the IJ switch for stopping the drive motor 211, which is caused by variations in the required rotational force of the main unit, can be prevented by simply allowing some leeway.
Moreover, this does not lead to an increase in the time rating of the drive tib machine.Therefore, there is no need to equalize the strength of the inertia absorption device or mechanical members (this makes it possible to apply it to small circuit breakers, and also to control Adjusting the operating point of the switch is also a labor expense.

[Effect of idea]

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

[Brief explanation of drawings]

Figures 1 to 18- show an embodiment of the electrically operated circuit breaker according to the present invention, in which Figure 1 is a plan view with the cover removed, Figure 2 is a longitudinal sectional view, and Figure 3 is a horizontal sectional view. , FIGS. 4 to 6 are side views showing the operation process of the toggle mechanism 50,
7 to 9 are side views showing the operating process of the drive mechanism 100, FIGS. 10 and 11 are plan views and side views of the electric actuator 200, and FIGS. 12 to 18 are side views of the electric actuator 200. 03.4 is a side view of the main part showing the operation process of
...Fixed contact, 7. Movable contact assembly, 30. Main contact device, 31 Side plate, 50. Toggle mechanism, 100 Drive mechanism, 101 Operation shaft, 102. Cam,
106 closing spring assembly, 200 electric actuator, 201 one-way clutch, 204... operating arm, 206 operating lever, 206a... oblong hole, 207 tension spring, 211
- Drive motor, 212 - Reduction mechanism, 217 eccentric pin, 218 roller. Figure 12 Figure 14 Figure 15 Figure 17

Claims (1)

[Claims] 1) 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 main contact assembly, and a movable contact that is connected to the movable contact assembly and is in a closed position when standing up and in an open position when collapsed. a drive mechanism having a toggle mechanism that moves the assembly, an operating shaft fitted with a cam that engages the toggle mechanism to raise the assembly from the collapsed state and stores energy in the released closing spring assembly; An operating arm coupled via a clutch, an operating lever rotatably coupled to the operating arm, and a tension between the operating arm and the operating lever, urging each other in a direction that restricts rotation in one direction. 1. An electrically operated circuit breaker comprising: a spring; and an electrically operated operating device including a drive motor that swings and drives the tip of the operating lever.