JPH0336008Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention mainly relates to an electric actuator of 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 a single 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, the operating point of the limit switch must be adjusted as much as possible, since variations in the rotational force of the drive motor, the required operating force of the circuit breaker body, 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 limit switch's operating point, such as when the stop time is too early, causing the operation to be incomplete. Furthermore, since there is plenty of space around the area, many disadvantages have to be overcome, such as simply extending the time rating of the drive motor or increasing the mechanical strength of the drive mechanism, which ignores economic efficiency. It was something I had.

[Purpose of the invention] In view of the above, the purpose of this invention is to reduce the time required for adjusting the control switch and improve reliability, taking economic efficiency into consideration, and to provide electric operation that does not cause burnout of the drive motor or damage to mechanical members. The purpose of the present invention is to provide a shaped circuit breaker.

[Key points of the idea]

The main point of this invention is to achieve the above-mentioned purpose by providing a main contact device consisting of a fixed contact and a movable contact assembly that can be brought into contact with and separated from the fixed contact, and side plates arranged in parallel on both sides of the contact device. a toggle mechanism having one end pivotally supported by the side plate and the other end connected to the movable contact assembly, which moves the movable contact assembly to a closed position when standing up and to an open position when collapsing, and the toggle mechanism; A drive mechanism having an operating shaft pivotally supported by the side plate and equipped with a cam that engages with the mechanism to raise it from a collapsed state and store energy in the released closing spring set; and an electric operating device that drives the drive mechanism. an electrically operated circuit breaker comprising: an operating lever that is coupled to the operating shaft via a one-way clutch and has a wide groove at its tip; and an electrically operated circuit breaker that is rotatably coupled to the operating lever; an auxiliary lever biased by a spring in a direction to close the groove; an eccentric pin rotatably sandwiched between the groove of the operation lever and the auxiliary lever; and a drive motor that rotationally drives the eccentric pin. The purpose is to prevent burnout of the drive motor and damage to the drive mechanism by operating only the control lever in response to an increase in load and prolongation of rotation time after the energy storage operation is completed.

[Example of idea]

1 to 18 are views showing one embodiment of the electrically operated circuit breaker according to this invention, and FIGS. 1 to 3 show a plan view, longitudinal sectional view, and cross sectional view, and Fig. 6 shows 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. It is shown. 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 main contact device 30, in a case 1 made of an insulating material. stored,
It is covered with a cover 60 made of an insulating material and is formed into a box shape. The main contactor device 30 includes a first fixed contactor 3 mounted on the base 2 of the case 1 and a second fixed contactor 4 facing the first fixed contactor 3 with a space therebetween.
and a movable contact assembly 7 which is pivotally supported on the tip of the second fixed contact 4 via a pin 5 and can be moved into and out of contact with a fixed contact 6 provided at the tip of the first fixed contact 3. ing. 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 10 integrated with the holder 9.
A crossbar 11 connects the three poles via
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 1 extending to the movable contact 8
4, and a cutoff spring 15 that is inserted between the crossbar 11 and the base 2 and urges the movable contact assembly 7 in the opening direction.
It is equipped with The movable contact 8 is provided with a movable contact 16 that faces the fixed contact 6 and moves toward and away from the fixed contact 6, and a sliding contact 17 that has an arc shape and slides into contact with the second fixed contact 4. Note that the 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 a load side terminal 20 to the second fixed contact 4, and a through-type overcurrent detection device 21 is fitted therein.

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 contactor device 30, and the other end pivoted to the side plate 31 via a shaft 51, so that the toggle mechanism 50 can rotate freely through pins 52 and 53. A first toggle link 54 that is made up of two pieces connected together, a second toggle link 55 that is made up of four pieces that sandwich each first toggle link 54 from both sides, and a second toggle link 55 that makes up a pair of two pieces. The main component is a pair of toggle levers 56 which are sandwiched on the other side. 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 via the pin 53, and the other end is locked. A claw pin 61 with a semicircular cross section of a tripping mechanism (not shown), which is provided with a claw 60 and rotatably supported on the side plate 31.
It is now possible to engage with The side plate 31 has a claw pin 61 on the other end side of the toggle lever 56.
A stopper 62 for restricting the counterclockwise rotation of the toggle lever 56 is located at a position opposite to the first toggle link 54 on the side of the second toggle link 55.
Roller stoppers 63 are fixed in pairs to regulate the bending angle. 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 the side plate 31, so that most of its members form a pair. It is composed of First, a cam 102 is integrated on the inside of the side plate 31 of the operation shaft 101, and the outside one is integrated with a manual operation handle 103 or an electric operation handle 2.
The cam 102 has a pin 10 on its side.
4 have been planted. A transmission link 105 is rotatably fitted to the operation shaft 101.
5 has a closing spring set 1 between it and the side plate 31.
06 is suspended via pins 107 and 108. The closing spring set 106 is composed of 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 coupled via a pin 115 to a cam follower 114 which is pivotally supported on the side plate 31 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 1
16 rolls on the outer peripheral surface 102a of the cam 102,
The clockwise rotation of the cam 102 is controlled by the cam follower 114.
The rotation is changed to counterclockwise. Further, each of the cam followers 114 is rotatably connected to a drive plate 118 via a pin 117 so as to sandwich it from both sides, and the drive pin 11 is connected to the other end of the drive plate 118.
9 is rotatably supported. Drive pin 119
are the concave and convex arcuate surfaces 58 and 59 of the receiving plate 57 of the toggle mechanism 50 which passes through the escape hole 32 provided in the side plate 31 and is located on the outside of the side plate 31.
It is now possible to engage with 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 protrusion 121 on the other side
2 is locked to a pawl shaft 123 having a semicircular cross section just before the cam 102 completes rotation. The pawl shaft 123 is rotatably supported by the 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 main contact device 30 and the operating device 40 to separate them from each other, and the separating plate 33 has an opening 34 through which the toggle link 50 enters and exits.
is provided. 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 21 coupled to the operating shaft 101.
0, a deceleration mechanism 220 that is coupled to the tip side of the operating lever assembly 210 and rotates, and a drive motor 2.
It consists of 11. Operation lever assembly 210
A boss 202 is fitted onto the operating shaft 101 via a one-way clutch 201, an operating lever 204 is fixed to the boss 202 with a screw 203, and a pin 205 connects the operating lever 204 to the operating lever 204. an auxiliary lever 206 that is coupled so as to be rotatable in the direction of rotation) and that the front side edge of the operating lever 204 comes into contact with the opposite edge; A wide groove 204a that opens along the longitudinal direction at the edge that contacts the auxiliary lever 206, and a pin 204b at the tip of the operating lever 204 and a pin 206a at the tip of the auxiliary lever 206 are stretched between and attached to the abutting side. A tension spring 207 is provided. The speed reduction mechanism 220 supports a drive motor 211 in parallel with the operating shaft 101 and rotatably supports a reduction gear 212, which will be described later, and includes a side plate 213 fixed to the separator 33 in a facing arrangement, and the speed reduction mechanism 212.
A pinion 214 integrated with the shaft of a drive motor 211 constituting a pinion 214 and a spur gear 215 meshing with the pinion 214
The operating lever 20 is rotatably supported by an eccentric pin 217 extending from the shaft 216 of the spur gear 215.
The roller 218 rolls on the inner edge of the groove 204a of No. 4 and the edge of the auxiliary lever 206 that closes the opening of the groove 204a. Therefore, when the drive motor 211 rotates, the decelerated eccentric pin 21
Reference numeral 7 denotes an auxiliary lever 2 which is integrally connected by a spring 207 through its eccentric circular motion via a roller 218.
03 and the operating lever 204 in the vertical direction.

The operation in the above configuration is as follows: First, a command to start accumulating energy is given to the drive motor 211 shown in FIG.
When rotated counterclockwise, the eccentric pin 217 rotates about the shaft 216 via the pinion 214 and the spur gear 215. As is clear from FIG. 12, which shows the starting position, this rotation causes the roller 218 fitted into the eccentric pin 217 to move into the groove 20 of the operating lever 204.
4a and the inner edge surrounded by an auxiliary lever 206 that closes the opening of the groove 204a. As a result of this rolling, the auxiliary lever 206 rotates clockwise about the pin 205, and at the same time, the operating lever 204, which is connected via the tension spring 207 stored as described above, also follows and rotates the operating shaft 101. The operating shaft 10 rotates clockwise as the axis.
1 is rotated via a one-way clutch 201. This process is shown in FIGS. 12-13-14. As the drive motor 211 rotates, the shaft 216, eccentric pin 217, and roller 218 further rotate, passing through the state shown in FIG.
Return to the state shown in the figure. This figure 14-15-1
In the movement process shown in Fig. 2, the rotation direction of the operating lever 204 changes and becomes downward, and the one-way clutch 2
01 is now rotated counterclockwise, but since the one-way clutch 201 does not transmit force in this direction, the operating shaft 101 is not driven and is stopped. As the operating lever 204 repeats such rocking motion, the cam integrated with the operating shaft 101 rotates clockwise in steps (steps). As a result, the roller shaft 116 rolls along the cam surface 102a as the cam 102 rotates clockwise, as shown in FIG.
Rotate 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. Figure 8 shows the cam 102
is shown 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 comes to be locked with the claw shaft 123, and the cam Surface 102a
After the apex of the roller shaft 116 passes, the pin 104 comes into contact with the protrusion 121 as shown in FIG. is completed. At this time, the operating lever 204 stops at the position shown in FIG. 16, but the auxiliary lever 206 continues to rotate due to inertia even after the drive motor 211 is disconnected from the power source, stretching the tension spring 207 and stretching the tension spring 207 as shown in FIGS. 17-18. It continues to rotate and repeats the same operation, and stops when the drive motor 211 loses its inertia.

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 contact device 30 is in the open state and the operating device 40 is in the energized state in FIG. As shown in FIG. 9, when the claw shaft 123 is rotated clockwise, the claw 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 about the pin 53, and the movable contact 8 comes into contact with the first fixed contact 3, and then as shown in FIGS. The toggle link 55 contacts the roller stopper 63, that is, the toggle mechanism 50 stands up, and at the same time, the transmission link 105 contacts the stopper 124, completing the closing or closing operation of the main contact device 30. At this time, the toggle lever 56 has its claw portion 60 connected to the claw pin 61.
and is urged clockwise by the spring forces of the contact spring 12 and the cutoff spring 15. Next, the shutoff operation is performed by rotating the pawl pin 61 clockwise to rotate the toggle lever 56 clockwise, and the second toggle link 55 slips between the drive pin 119 and the roller stopper 63 and moves upward. 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 contact device 30 separates. 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 a concave arc surface 59 made by sliding on the convex arc surface 58 of the receiving plate 57. When the electric actuator 200 is rotated from the state where the closing is completed (FIG. 4), it is possible to store energy in the closing spring set 106 while maintaining the upright state of the toggle mechanism 50, that is, the closed state 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 cutoff operation, and immediately after the cutoff, the pawl shaft 1
23 clockwise, it can be thrown in again. In other words, each operation of shutting off, turning on, and shutting off can be performed immediately without having to perform an energy storage operation in between.

In the above configuration, according to this embodiment, the operating shaft 101 is not directly rotated by the rotational force of the drive motor 211 to store the energy in the closing spring set 106, but the rotational force is used to repeatedly store and release the energy in the meantime. Esu tension spring 2
07 and the operating shaft 101 is rotated by its spring force, even if the control switch of the drive motor 211 fails or the motor continues to rotate due to inertial rotational force after energy storage is completed, the drive motor 211 can be rotated by the spring force. Burnout accidents are prevented, and the drive electric motor 211 mainly reduces the variation in the required rotational force of the main unit.
It is only necessary to adjust the position of the limit switch for stopping the motor so that there is a margin, 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 also eliminating the need to adjust the operating point of the control switch.

[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 storing energy in the closing spring and the drive motor, making adjustment easy. 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 this invention, with Figure 1 being a plan view with the cover removed, Figure 2 being a longitudinal cross-sectional view, and Figure 3 being a cross-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 operating process of the electric operating device 200. 3, 4... Fixed contact, 7... Movable contact assembly, 30... Main contact device, 31... Side plate, 50... Toggle mechanism, 100... Drive mechanism, 101... Operating shaft, 102...Cam, 106
... Closing spring assembly, 200 ... Electric actuator, 201
... One-way clutch, 204 ... Operation lever, 204a ... Groove, 206 ... Auxiliary lever, 2
07...Tension spring, 211...Drive motor, 21
2...Deceleration mechanism, 217...Eccentric pin, 218...
…roller.

Claims (1)

[Scope of utility model registration request] A main contactor device consisting of a fixed contactor and a movable contactor assembly that can be moved into and out of contact with the main contactor device, side plates arranged in parallel on both sides of the contactor device, one end of which is pivoted to the side plate and the other end of which is pivoted to the side plate. a toggle mechanism connected to the movable contact assembly that moves the movable contact assembly to a closed position when standing up and to an open position when collapsed; An electrically operated circuit breaker comprising: a drive mechanism having an operating shaft mounted with a cam for accumulating a closing spring set and pivotally supported by the side plate; and an electric operating device for driving the drive mechanism; An electric operating device includes an operating lever that is coupled to the operating shaft via a one-way clutch and has a wide groove at its tip, and is rotatably coupled to the operating lever and is biased by a spring in a direction to close the groove. 1. An electrically operated circuit breaker comprising: an auxiliary lever; an eccentric pin rotatably sandwiched between the groove of the operating lever and the auxiliary lever; and a drive motor that rotationally drives the eccentric pin.